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Smejkal and Darren J. Bauer Part",authors:[{id:"110134",title:"Prof.",name:"Gary",middleName:null,surname:"Smejkal",fullName:"Gary Smejkal",slug:"gary-smejkal"}]},{id:"35097",title:"Denaturing Gradient Gel Electrophoresis (DGGE) in Microbial Ecology - Insights from Freshwaters",slug:"denaturing-gradient-gel-electrophoresis-dgge-in-microbial-ecology-insights-from-freshwaters",signatures:"Sofia Duarte, Fernanda Cassio and Claudia Pascoal",authors:[{id:"115878",title:"Dr.",name:"Sofia",middleName:null,surname:"Duarte",fullName:"Sofia Duarte",slug:"sofia-duarte"},{id:"138487",title:"Prof.",name:"Fernanda",middleName:null,surname:"Cássio",fullName:"Fernanda Cássio",slug:"fernanda-cassio"},{id:"138488",title:"Prof.",name:"Cláudia",middleName:null,surname:"Pascoal",fullName:"Cláudia Pascoal",slug:"claudia-pascoal"}]},{id:"35098",title:"Statistical Analysis of Gel Electrophoresis Data",slug:"statistical-analysis-of-gel-electrophoresis-data",signatures:"Kimberly F. Sellers and Jeffrey C. Miecznikowski",authors:[{id:"84103",title:"Dr.",name:"Jeffrey",middleName:null,surname:"Miecznikowski",fullName:"Jeffrey Miecznikowski",slug:"jeffrey-miecznikowski"},{id:"95380",title:"Dr.",name:"Kimberly",middleName:null,surname:"Sellers",fullName:"Kimberly Sellers",slug:"kimberly-sellers"}]},{id:"35099",title:"Quantitative Analysis of Electrophoresis Data - Application to Sequence-Specific Ultrasonic Cleavage of DNA",slug:"quantitative-analysis-of-electrophoresis-data-application-to-sequence-specific-ultrasonic-cleavage-o",signatures:"Sergei Grokhovsky, Irina Il’icheva, Dmitry Nechipurenko, Michail Golovkin, Georgy Taranov, Larisa Panchenko,\r\nRobert Polozov and Yury Nechipurenko",authors:[{id:"113885",title:"Dr.",name:"Sergei",middleName:null,surname:"Grokhovsky",fullName:"Sergei Grokhovsky",slug:"sergei-grokhovsky"},{id:"138334",title:"Dr.",name:"Irina",middleName:null,surname:"Il'Icheva",fullName:"Irina Il'Icheva",slug:"irina-il'icheva"},{id:"138335",title:"Dr.",name:"Dmitry",middleName:null,surname:"Nechipurenko",fullName:"Dmitry Nechipurenko",slug:"dmitry-nechipurenko"},{id:"138336",title:"Dr.",name:"Michail",middleName:null,surname:"Golovkin",fullName:"Michail Golovkin",slug:"michail-golovkin"},{id:"138337",title:"Mr.",name:"Georgy",middleName:null,surname:"Taranov",fullName:"Georgy Taranov",slug:"georgy-taranov"},{id:"138338",title:"Dr.",name:"Larisa",middleName:null,surname:"Panchenko",fullName:"Larisa Panchenko",slug:"larisa-panchenko"},{id:"138339",title:"Dr.",name:"Robert",middleName:null,surname:"Polozov",fullName:"Robert Polozov",slug:"robert-polozov"},{id:"138340",title:"Dr.",name:"Yury",middleName:null,surname:"Nechipurenko",fullName:"Yury Nechipurenko",slug:"yury-nechipurenko"}]},{id:"35100",title:"The Use of Pulsed Field Gel Electrophoresis in Listeria monocytogenes Sub-Typing - Harmonization at the European Union Level",slug:"harmonization-of-listeria-monocytogenes-pfge-sub-typing-at-european-union-level",signatures:"Benjamin Felix, Trinh Tam Dao, Bertrand Lombard, Adrien Assere Anne Brisabois and Sophie Roussel",authors:[{id:"116745",title:"Dr.",name:"Sophie",middleName:null,surname:"Roussel",fullName:"Sophie Roussel",slug:"sophie-roussel"},{id:"118109",title:"Dr.",name:"Benjamin",middleName:null,surname:"Félix",fullName:"Benjamin Félix",slug:"benjamin-felix"}]},{id:"35101",title:"Electrophoretic Techniques in Microbial Ecology",slug:"electrophoretic-techniques-in-microbial-ecology",signatures:"Elena Gonzalez-Toril, David Lara-Astiaso, Ricardo Amils and Angeles Aguilera",authors:[{id:"68352",title:"Dr.",name:"Angeles",middleName:null,surname:"Aguilera",fullName:"Angeles Aguilera",slug:"angeles-aguilera"},{id:"74686",title:"Dr.",name:"Ricardo",middleName:null,surname:"Amils",fullName:"Ricardo Amils",slug:"ricardo-amils"},{id:"117519",title:"Dr.",name:"Elena",middleName:null,surname:"González-Toril",fullName:"Elena González-Toril",slug:"elena-gonzalez-toril"},{id:"117529",title:"Mr.",name:"David",middleName:null,surname:"Lara-Astiaso",fullName:"David Lara-Astiaso",slug:"david-lara-astiaso"}]},{id:"35102",title:"Application of Multiplex PCR, Pulsed-Field Gel Electrophoresis (PFGE), and BOX-PCR for Molecular Analysis of Enterococci",slug:"application-of-multiplex-pcr-pulsed-field-gel-electrophoresis-pfge-and-box-pcr-for-molecular-analysi",signatures:"Charlene R. Jackson, Lori M. Spicer, John B. Barrett and Lari M. Hiott",authors:[{id:"82511",title:"Dr",name:"Charlene",middleName:null,surname:"Jackson",fullName:"Charlene Jackson",slug:"charlene-jackson"},{id:"114713",title:"Mr.",name:"John",middleName:null,surname:"Barrett",fullName:"John Barrett",slug:"john-barrett"},{id:"137245",title:"Mrs.",name:"Lori",middleName:null,surname:"Spicer",fullName:"Lori Spicer",slug:"lori-spicer"},{id:"137246",title:"MSc.",name:"Lari",middleName:null,surname:"Hiott",fullName:"Lari Hiott",slug:"lari-hiott"}]},{id:"35103",title:"The Use of Pulsed Field Gel Electrophoresis in Listeria monocytogenes Sub-Typing - Comparison with MLVA Method Coupled with Gel Electrophoresis",slug:"feasibility-of-the-mlva-method-coupled-with-agarose-gel-electrophoresis-for-subtyping-listeria-monoc",signatures:"Sophie Roussel, Marie-Leone Vignaud, Jonass T Larsson, Benjamin Felix, Aurore Rossignol,\r\nEva Moller Nielsen and Anne Brisabois",authors:[{id:"116745",title:"Dr.",name:"Sophie",middleName:null,surname:"Roussel",fullName:"Sophie Roussel",slug:"sophie-roussel"},{id:"118109",title:"Dr.",name:"Benjamin",middleName:null,surname:"Félix",fullName:"Benjamin Félix",slug:"benjamin-felix"}]},{id:"35104",title:"Restriction Fragment Length Polymorphism Analysis of PCR-Amplified Fragments (PCR-RFLP) and Gel Electrophoresis - Valuable Tool for Genotyping and Genetic Fingerprinting",slug:"restriction-fragment-length-polymorphism-analysis-of-pcr-amplified-fragments-pcr-rflp-and-related-te",signatures:"Henrik Berg Rasmussen",authors:[{id:"114068",title:"Dr.",name:"Henrik",middleName:null,surname:"Rasmussen",fullName:"Henrik Rasmussen",slug:"henrik-rasmussen"}]},{id:"35105",title:"Application of Two-Dimensional Gel Electrophoresis to Microbial Systems",slug:"application-of-two-dimensional-gel-electrophoresis-to-microbial-systems",signatures:"Fatemeh Tabandeh, Parvin Shariati and Mahvash Khodabandeh",authors:[{id:"115663",title:"Dr.",name:"Fatemeh",middleName:null,surname:"Tabandeh",fullName:"Fatemeh Tabandeh",slug:"fatemeh-tabandeh"},{id:"118100",title:"Dr.",name:"Parvin",middleName:null,surname:"Shariati",fullName:"Parvin Shariati",slug:"parvin-shariati"},{id:"118101",title:"Dr.",name:"Mahvash",middleName:null,surname:"Khodabandeh",fullName:"Mahvash Khodabandeh",slug:"mahvash-khodabandeh"}]}]}],publishedBooks:[{type:"book",id:"2115",title:"Biotechnology",subtitle:"Molecular Studies and Novel Applications for Improved Quality of Human Life",isOpenForSubmission:!1,hash:"07ebd9c0af07dd6b0649bc67ae612b1e",slug:"biotechnology-molecular-studies-and-novel-applications-for-improved-quality-of-human-life",bookSignature:"Reda Helmy Sammour",coverURL:"https://cdn.intechopen.com/books/images_new/2115.jpg",editedByType:"Edited by",editors:[{id:"32232",title:"Dr.",name:"Reda",surname:"Sammour",slug:"reda-sammour",fullName:"Reda Sammour"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"2303",title:"Gel Electrophoresis",subtitle:"Advanced Techniques",isOpenForSubmission:!1,hash:"99b6af88dfcbe43d82dc7293184207c1",slug:"gel-electrophoresis-advanced-techniques",bookSignature:"Sameh Magdeldin",coverURL:"https://cdn.intechopen.com/books/images_new/2303.jpg",editedByType:"Edited by",editors:[{id:"123648",title:"Dr.",name:"Sameh",surname:"Magdeldin",slug:"sameh-magdeldin",fullName:"Sameh Magdeldin"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"3404",title:"Environmental Biotechnology",subtitle:"New Approaches and Prospective Applications",isOpenForSubmission:!1,hash:"925d14b19ca0f7945996b169d9836f5b",slug:"environmental-biotechnology-new-approaches-and-prospective-applications",bookSignature:"Marian Petre",coverURL:"https://cdn.intechopen.com/books/images_new/3404.jpg",editedByType:"Edited by",editors:[{id:"74654",title:"Prof.",name:"Marian",surname:"Petre",slug:"marian-petre",fullName:"Marian Petre"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"4529",title:"Biotechnology",subtitle:null,isOpenForSubmission:!1,hash:"187f1fe91150e1be30e641799522b977",slug:"biotechnology",bookSignature:"Deniz Ekinci",coverURL:"https://cdn.intechopen.com/books/images_new/4529.jpg",editedByType:"Edited by",editors:[{id:"13652",title:"Prof.",name:"Deniz",surname:"Ekinci",slug:"deniz-ekinci",fullName:"Deniz Ekinci"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"584",title:"Advances in Applied Biotechnology",subtitle:null,isOpenForSubmission:!1,hash:"fcc9fab84b820983f2a462d5145d2a0e",slug:"advances-in-applied-biotechnology",bookSignature:"Marian Petre",coverURL:"https://cdn.intechopen.com/books/images_new/584.jpg",editedByType:"Edited by",editors:[{id:"74654",title:"Prof.",name:"Marian",surname:"Petre",slug:"marian-petre",fullName:"Marian Petre"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}],publishedBooksByAuthor:[{type:"book",id:"2115",title:"Biotechnology",subtitle:"Molecular Studies and Novel Applications for Improved Quality of Human Life",isOpenForSubmission:!1,hash:"07ebd9c0af07dd6b0649bc67ae612b1e",slug:"biotechnology-molecular-studies-and-novel-applications-for-improved-quality-of-human-life",bookSignature:"Reda Helmy Sammour",coverURL:"https://cdn.intechopen.com/books/images_new/2115.jpg",editedByType:"Edited by",editors:[{id:"32232",title:"Dr.",name:"Reda",surname:"Sammour",slug:"reda-sammour",fullName:"Reda Sammour"}],equalEditorOne:null,equalEditorTwo:null,equalEditorThree:null,productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},onlineFirst:{chapter:{type:"chapter",id:"80488",title:"Phytoextraction of Zn(II) and Cu(II) by Canna indica: Related Physiological Effects",doi:"10.5772/intechopen.102450",slug:"phytoextraction-of-zn-ii-and-cu-ii-by-canna-indica-related-physiological-effects",body:'Heavy metal pollution of soil and water is a worldwide concern because of its harmful effect on human health. The constant accumulation of heavy metals in soil can pose a serious risk to living organisms including plants, animals, and microorganisms [1, 2]. To date, phytoremediation is confirmed to be the most environmentally friendly and cost-effective strategy. Types of phytoremediation include phytoextraction, phytovolatilization, phytostabilization, phytodegradation, and rhizosphere. The advantages of phytoremediation compared with traditional physical surface and chemical remediation methods are low cost and simplicity [3]. Phytoremediation is linked with the morphological, biochemical, and physiological effects on plant growth. During the phytoremediation process, some morphophysiological growth parameters have to be evaluated such as root growth, net biomass weight, leaf area, the net rate of photosynthesis, the effects on the plasma membrane of plants, reactive oxygen species (ROS) generation, hydrogen peroxide (H2O2) content, and malondialdehyde (MDA) level, linked to genotoxicity. Plants try to elude their harmful effects by adopting various defense mechanisms, which include antioxidant activation and other mechanisms of metal homeostasis. In response, plants have developed enzymatic and nonenzymatic antioxidant mechanisms and increased activities of catalase (CAT), superoxide dismutase (SOD), ascorbate peroxidase (APX), and peroxidase (POD) [4].
In literature,
This study aimed to evaluate the impact of Zn(II) and Cu(II) excess on the growth and metabolism of
The test was carried out in a greenhouse with natural light, forced ventilation, and controlled temperature in La Plata city (Argentina) (34°54′45.5″ S–57°55′51.5″ W) from April to July (2019).
Once germination had occurred, the seedlings were transferred to 0.5 L pots and then to 5 L pots with a substrate composed of soil and sand (2:1 v/v). After 45 days, when the plants were approximately 50 cm tall, metal solutions were applied by immersion for 24 h. Cu(II) was added in the form of SO4Cu·5H2O in three concentrations (500, 1000, and 1500 ppm) and Zn(II) in the form of SO4Zn·7H2O in three concentrations (1000, 2000, and 3000 ppm).
After 21 days of the application, plants were harvested to perform the different physiological and biochemical determinations.
At harvest, the dry weight per plant (DW) was determined for all treatments by oven-drying them at 80°C until constant weight, distinguishing the shoot from roots.
For all treatments, the contents of chlorophyll and carotene were determined from a 1 cm diameter leaf disk. Pigment content calculation was performed using Wellburn technique [8] with a Shimadzu UV 160-A spectrophotometer (Kyoto, Japan). The results were expressed in μg of chlorophyll cm−2 and μg of carotenoids cm−2.
where A is absorbance, Ca is chlorophyll a content, and Cb is chlorophyll b concent.
The soluble protein content was measured from 100 mg of fresh leaves and root material, employing the Bradford method [9]. The protein content calculation was carried out using a standard curve prepared with different concentrations of bovine serum albumin (BSA) (SiFMa Chemical Co.).
Proline determination was carried out taking 100 mg of fresh leaf and root material and homogenized with 2 ml of a 3% sulfosalicylic acid solution in water. The homogenate was centrifuged at 12,000g for 15 min, and 1 ml of the extract obtained was taken. Then 1 ml of the acidic ninhydrin reagent and 1 ml of glacial acetic acid were added to the extract in a 15 ml tube and put in a water bath at 100°C for an h. After this period, the reaction was stopped by rapidly cooling the tube. After, 2 mL of toluene was added to the above reaction mixture and vortexed for 15–20 s. The phases were allowed to separate and the aqueous phase containing the toluene-proline chromophore was taken. The absorbance at 520 nm was read using toluene as a blank. Proline content per unit of fresh weight was calculated according to:
where, FW is fresh weight.
The amount of malondialdehyde (MDA) content in fresh tissues was determined by the reaction with thiobarbituric acid (TBA) described in the Heath and Packer method [10]. In total, 200 mg of fresh leaf tissue and 200 mg of fresh root tissue were ground with 1 ml of 0.1% trichloroacetic acid (TCA) and then centrifuged. The supernatant was reacted with 1 ml of the trichloroacetic acid (TCA), butylhydroxytoluene (BHT) and thiobarbituric acid (TBA) reagent (20% trichloroacetic acid (TCA), 0.37% thiobarbituric acid TBA and butylhydroxytoluene BHT 0.01 g), then the tubes were incubated for 30 min at 95°C. After this period, they were placed in an ice bath to rapidly stop the reaction, and then they were centrifuged at 10,000g for 10 min. Finally, the supernatant was separated, and the absorbance at 532 and 600 nm was read on a Shimadzu UV 160 UV/V spectrophotometer. The MDA concentration was calculated using an extinction coefficient of 155 mM−1 cm−1:
where MDA is malondialdehyde content,
The determination of the relative conductivity (RC) of the cell membranes was made from 200 mg of fresh leaf material and 200 mg of fresh root material, from the different treatments, according to the Lutts method [11]. Immediately after sampling, the tissues were washed three times with redistilled water for 15 s, to remove the electrolytes adhering to the surface and those released by the wounds produced by the cut. Subsequently, each sample was immersed in a tube with 10 ml of double-distilled water where they remained for 4 h at room temperature. Following this, the electrical conductivity (dS m−1) was determined using a Jenco model 3173 conductivity meter. Then, the tubes were capped and taken to an autoclave where they were kept for 20 min at a one-atmosphere pressure and 120°C, to affect the integrity of the membranes. Finally, the tubes were allowed to cool to room temperature, and the electrical conductivity of the medium was measured again. Based on the data obtained, the relative conductivity of cell membranes was estimated from the following formula:
where
Plant tissues were digested in triplicate with concentrated perchloric and nitric acids in a 1:4 ratio (Merck, analytical grade), for the analyses of Cu(II) and Zn(II) (FAO & SIDA, 1983). Luoma method [12] was used to analyze the Cu(II) and Zn(II) labile fraction of sediments, being mineralized with hydrochloric acid (1 N, Merck analytical grade) by shaking for 24 h. Then, the absorbance was read using an atomic absorption spectrophotometer (Shimadzu AA6650F Atomic Absorption Spectrophotometer, Japan). The data obtained were employed for calculating the bioavailability, accumulation, translocations, and bioaccumulation indexes. All values were expressed on the dry weight of the respective sample [13].
where BAI is bioavailability index and indicates if the metal is extracted and accumulated in the root; AI is accumulation index and indicates if the metal is extracted and accumulated in the aerial part; TI is translocation index and indicates if the metal is translocated to the aerial part; BI is bioaccumulation index and indicates if the metal is accumulated in the biomass.
The experimental design was fully randomized with a control (without addition of heavy metals solutions), two metals, and three concentrations for each one. The number of repetitions per treatment was
A negative effect on growth was found, expressed in a decrease in total biomass, as in Figure 1A and B. This result varied approximately 82 and 59% between the control (0 ppm) and the maximum concentration of Zn(II) (3000 ppm) and Cu(II) (1500 ppm), respectively. The dry weight of the root and the aerial part decreased by 82% for Zn(II), whereas 62 and 56% for Cu(II), respectively. A significant reduction was observed from the lowest concentration of Zn(II) (1000 ppm) while for Cu(II), this decrease was observed from the middle concentration (1000 ppm). The reduction of biomass, both shoot and root, shows the same pattern, as the metal concentration increases, the decrease of biomass becomes greater (Figure 1A and B).
Shoot and root dry weight (mg) of
Figure 1A and B represent chlorophyll and carotenes concentration in Zn (II) and Cu(II) systems, respectively. A significant decreased of chlorophyll and carotenes concentration was observed in Cu(II) treatment (1500 ppm) compared with the control (Figure 1B). This difference was approximately 47 and 16% for chlorophyll and carotenes content, respectively. However, chlorphyll and carotens concentration in Zn(II) systems (Figure 1A) were not affected.
Figure 3 shows the relativity conductivity (RC) percentage in roots and leaves in Zn(II) (A) and Cu(II) (B) systems. A gradual increase of relativity conductivity (RC) in roots with increasing Zn(II) and Cu(II) concentrations was noted. On the other hand, the RC in leaves biomass was not affected by Zn(II) and Cu(II) concentrations (Figure 3A and B).
Figure 4A and B represent malondialdehyde (MDA) content in the roots and leaves of
The soluble protein content in leaves and roots is shown in Figure 5. In general, it was determine there are not statistically significant differences of soluble protein content in roots for Zn(II) and Cu(II) systems, whereas the soluble protein content in leaves biomass decreased about 26% compared with the Cu(II) maximum concentration and the control (Figure 5A and B).
Figure 6 represents proline content in leaves and roots for Zn(II) and Cu(II) systems. The proline content in leaves increased with the increase of Zn(II) and Cu(II) concentrations, but statistically significant differences were determine only in the maximum concentrations for both metals compared with control system (Figure 6A and B).
Figure 7A and B show the mean bioaccumulation values for Zn(II) and Cu(II) in shoot, roots, and total biomass of
On the other hand, the bioavailability (BAI), accumulation (AI), translocation (TI), and bioaccumulation (BI) indexes were calculated with the results mentioned above (Table 1). It was determined that BAI, AI, and BI indexes ˃ 1 for Zn(II) and Cu(II) system. These results mean
Treatment | BAI (root/substrate) | AI (shoot/substrate) | TI (shoot/root) | BI (Biomass/substrate) |
---|---|---|---|---|
1000 ppm Zn(II) | 5.409 ± 0.68 | 3.574 ± 0.32 | 0.663 ± 0.03 | 8.983 ± 1 |
2000 ppm Zn(II) | 3.940 ± 0.12 | 1.922 ± 0.12 | 0.488 ± 0.04 | 5.862 ± 0.14 |
3000 ppm Zn(II) | 14.283 ± 0.27 | 4.700 ± 0.27 | 0.329 ± 0.02 | 18.982 ± 0.31 |
500 ppm Cu(II) | 3.966 ± 0.35 | 0.632 ± 0.02 | 0.160 ± 0.01 | 4.597 ± 0.37 |
1000 ppm Cu(II) | 4.907 ± 0.74 | 0.706 ± 0.09 | 0.144 ± 0.01 | 5.613 ± 0.83 |
1500 ppm Cu(II) | 2.540 ± 0.07 | 0.318 ± 0.02 | 0.125 ± 0.01 | 2.858 ± 0.09 |
BAI (bioavailability), AI (accumulation), TI (translocation), and BI (bioaccumulation) for Zn(II) and Cu(II) systems.
Pearson coefficients (r) showed, for Zn(II), a significant negative correlation for shoot and root dry weight, whereas shoot malondialdehyde (MDA) and proline content and root-relative conductivity showed the opposite. For Cu(II), negative significant correlations were found for shoot dry weight, chlorophyll, and protein content while positive correlations were found for shoot proline content and root-relative conductivity. Positive correlations show an increase of both variables, whereas a negative correlation indicates a decrease in the second variable when the first variable increases (Table 2).
Variable 1 | Variable 2 | Zn (II) ( | Cu(II) ( | |||
---|---|---|---|---|---|---|
Metal concentration | Shoot dry weight | −0.74 | 0.001* | −0.67 | 0.0048* | |
Metal concentration | Chlorophyll | −0.05 | 0.8524 | −0.61 | 0.0113* | |
Metal concentration | Carotenes | 0.33 | 0.2525 | −0.36 | 0.175 | |
Metal concentration | Relative conductivity | −0.23 | 0.3991 | 0.11 | 0.6825 | |
Metal concentration | MDA content | 0.53 | 0.0339* | 0.32 | 0.2257 | |
Metal concentration | Soluble proteins content | 0.33 | 0.2068 | −0.58 | 0.0195* | |
Metal concentration | Proline content | 0.6 | 0.0144* | 0.66 | 0.0053* | |
Metal concentration | Root dry weight | −0.8 | 0.0002* | −0.78 | 0.0003* | |
Metal concentration | Relative conductivity | 0.63 | 0.0086* | 0.93 | <0.0001* | |
Metal concentration | MDA content | −0.28 | 0.3254 | 0.44 | 0.1188 | |
Metal concentration | Soluble proteins content | −0.1 | 0.6989 | −0.22 | 0.4279 | |
Metal concentration | Proline content | −0.03 | 0.9212 | 0.28 | 0.3267 |
Zn(II) and Cu(II) bioaccumulation correlated with physiological effects by Pearson stastical method.
Zinc is an essential trace element for normal plant growth. There are important enzymes that contain zinc, such as the enzyme alcohol dehydrogenase, carbonic anhydrase, ribonucleic acid (RNA) polymerase, and superoxide dismutase, a key enzyme in protection against oxidative stress. Zinc activates different enzymes responsible for the synthesis of certain proteins. It is involved in the formation of chlorophyll and some carbohydrates. It is essential in the formation of auxins, which help regulate stem development and elongation, in addition to being the precursor of tryptophan [14]. Copper also plays a key function in normal plant growth. For example, it participates in CO2 assimilation and adenosine triphosphate (ATP) production [15]. It is the main constituent of diverse proteins such as plastocyanin of the photosynthetic system and cytochrome oxidase of the electron transport chain [16]. It plays a significant function in cell wall metabolism, signaling to the transcription protein trafficking apparatus, oxidative phosphorylation, iron armament, and biogenesis of molybdenum cofactor [17]. Both are essential micronutrients necessary for the correct growth and development of plants; however, in high concentrations, they turn out to be phytotoxic, generating various negative metabolism modifications.
The results of our experiment indicate that some physiological and biochemical parameters of
Chlorophyll A, B, total and carotenes content of
Relative conductivity (RC) percentage (%) in roots and leaves biomass of
Malondialdehyde (MDA) content in the roots and leaves of
Soluble protein content in the roots and leaves of
Proline content in the roots and leaves of
(A) Zn(II) and (B) Cu(II) bioaccumulation in shoot, root, and total biomass of
The decrease observed in the biomass of
The biomass reduction related to Zn(II) toxicity is a consequence of mitosis inhibition that causes growth alterations product of the inhibition of deoxyribonucleic acid (DNA) synthesis [23]. Also could be the result of the alteration in macronutrient absorption [24] or the micronutrient distribution in different parts of the plant [25] such as lower uptake of Fe+2 and Fe+3; modification of the metabolic activity [26], inhibition of cellular division in the meristematic region, lengthening of root cells [27], reduction of cell viability, and death in the root tips [28].
Additionally, copper excess generates reactive oxygen species, which causes oxidative stress [29] that disrupts numerous metabolic pathways and modifies essential macromolecules [30]. Also, high copper concentrations cause negative modifications to DNA, photosynthesis, cell membrane integrity, enzyme activity, and respiration leading to general growth reduction [31]. Excess of copper in the roots can trigger alterations in the root system design that causes growth reduction, bronzing, necrosis, and nutritional inequities [32, 33].
Zinc helps to maintain membrane integrity, preserving the structural orientation of macromolecules and protecting the transportation systems [18], but in high concentrations, triggers reactions that promote oxidative stress and the breakdown of membrane integrity [24]. Similar behavior happens with copper excess, causing the disruption of cell wall integrity and deposition of electron-dense material in the cytoplasmic membranes [34]. An increase in the relative conductivity (RC) of cellular membranes would indicate damage at the membrane level; higher values than 30% indicate damage [35]. In this work, results show that RC significantly increased only in roots for both metals. However, the values obtained were relatively low, showing damage only in the highest concentrations. The degree of peroxidation of lipids and the degree of membrane damage are related and can be analyzed from the malondialdehyde (MDA) concentration and RC [36]. Increased levels of reactive oxygen species (ROS) caused by heavy metal stress could develop in damage to lipid membranes, proteins, pigments, and nucleic acids [37]. The malondialdehyde is a product of the lipid peroxidation of polyunsaturated fatty acids in cell membranes caused by oxidative stress and the production of ROS [35]. In this work, shoot MDA levels increased in the maximum concentration, in comparison to the control, for both metals, while in roots only copper treatments showed an increase in the maximum concentration. Also, this suggests that the antioxidant enzymes present in the roots of zinc treatments could have compensated the damage caused by ROS [38]. Similar results were found in different species such as
Another distinctive heavy metal toxicity symptom in plants is a reduction of the content of photosynthetic pigments [41]. They are directly related to photosynthesis and plant growth so, a decrease of the content of these pigments or damage done to chloroplasts results in lower CO2 assimilation and a biomass decrease [42]. Carotenoids participate in antioxidant defense systems and impart a significant role in ROS sequestration [43], preventing the peroxidation of lipid membranes. [42]. Chloroplasts, mitochondria, and cellular membranes are some of the main sites that generate ROS. They are interconnected to the electron transport system, so when oxidative stress occurs, these sites are the first to be affected [44]. The decline in chlorophyll content in plants exposed to heavy metals stress is related to the inhibition of important enzymes, such as 6-aminolevulinic acid dehydratase (ALA-dehydratase) and protochlorophyllide reductase associated with chlorophyll biosynthesis, and the reduction of Mg+2 and Fe+2 supply. Zinc in phytotoxic concentrations may be equivalent to magnesium, causing processes of substitution of the central ion of the tetrapyrrolic chlorophyll ring, inhibiting its function and decreasing its concentration [45]. Similar effects are caused by excessive copper concentrations. Photosynthetic pigments decrease might be the result of displacement of magnesium required for chlorophyll biosynthesis or ultra-structural alteration of chloroplast under metal toxicity [46]. Also, this reduction might be due to the inhibited activities of various enzymes associated with chlorophyll biosynthesis [47]. A similar effect was observed in the present work but only with statistical significance in copper-treated
Shoot-soluble protein content of
Proline is an amino acid that helps in activating many physiological and molecular responses in stress conditions. Its accumulation is a widespread response to heavy metal stress [62]. Shoot proline content con
Heavy metals are inorganic pollutants that cannot be degraded, so the principal strategy for plants should be to immobilize them in their rhizosphere, accumulate them in the roots, or translocate them to the aerial part [72]. They enter the root either by crossing the plasma membrane of the root endodermal cells, by entering the root apoplast through the space between cells, or with the aid of membrane transporter proteins. These transporters are present in membranes of different organelles such as tonoplasts, endoplasmic reticulums, mitochondria, or chloroplasts. [73]. Inside the plant, they can be chelated by glutathione (GSH), phytochelatins (PCs), or metallothioneins (MTs), chelators that have thiol (▬SH) groups, which gives them a high affinity for metal cations [74]. Also, this process may work synergistically with secondary stress-defensive antioxidative systems to combat metal-induced oxidative stress [75]. Metals in roots can be stored in vacuoles, cell walls or exported to the shoot via the xylem. Vacuoles are considered the main storage site for metals in plant cells, being a part of the tolerance mechanism [76].
In general, plants can contain, in their total biomass, Zn(II) in ranges from 30 to 100 mg kg−1 dry weight (DW); concentrations higher than 300 mg kg−1 DW are considered phytotoxic [77], but for other authors, this limit is set at 100 mg kg−1 DW [78]. For Cu(II), normal total biomass content ranges from 2 to 50 mg kg−1 DW, depending on the plant species. However, 5–20 mg kg−1 DW seems to be optimal, as toxicity symptoms appear above and deficiency symptoms below this critical range [79]. In the present work,
Indexes are calculated to determine the phytoextraction efficiency, mainly being the bioaccumulation index (BI) and the translocation index (TI) [83]. An effective phytoextraction process requires the translocation of metals to easily harvestable parts. Plants with BI values less than 1 are unsuitable for phytoextraction. In this work,
Some associations between physiological and biochemical parameters and the exposition of metals can be estimated by Pearson’s correlation coefficient (r). In this work,
The analysis of the correlation between metal accumulation and physiological parameters could be useful in different areas, such as variety selection, genetic improvement, environmental monitoring, or index construction as an indirect indicator of the phytoremediation process [88]. Various studies have demonstrated the correlation between metal accumulation and the antioxidant system. Antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD), show an increased production to protect the plant from the damage caused by reactive oxygen species (ROS) under metals exposure [89]. Also, malondialdehyde (MDA) could act as an indicator of lipid peroxidation and is usually related to assessing oxidative damage [28]. Lipid peroxidation and oxidative damage cause alterations in metabolic processes [90] such as photosynthesis or protein productions leading to a decrease of photosynthetic pigments, less CO2 assimilation, and diminution of biomass [91]. On the other hand, the accumulation of metabolites is another mechanism that plants use for stress tolerance. Proline is an amino acid that is involved in different stress mechanisms; it performs functions such as osmoregulation, stabilization of protein, and enzyme synthesis or even can chelate metal ions to help in the vacuolar sequestration [92]. These correlations are another way to demonstrate the tolerance mechanisms, and it helps to create comparations between species from the same genus or different cultivars to select the best for specific phytoremediation techniques becoming these, indicators of phytoremediation efficiency parallel to heavy metal accumulation [93].
Another use of these correlations is the construction of biomarkers. These represent the biological response to environmental disturbances or contamination, and they allow the detection of pollution at different contamination levels corresponding to concentrations difficult to achieve or when yield is not easy to form an integrative sample. There are three types of biomarkers: biomarkers of exposure: such as DNA breaks, stress proteins, and phytochelatins; biomarkers of effects such as morphological and physiological parameters; and biomarkers of susceptibility such as genetic mutations [94]. The use of such tools is currently increasing in the field of biomonitoring and bioremediation. Some biomarkers that have already been reported in plants are the following: oxidative stress by the production of reactive oxygen species [95], the reduction of macromorphological parameters such as plant height, stem diameter, and the number of leaves and negative modifications in chloroplasts with implications in photosynthesis [96]. These have been useful biomarkers for showing the adverse effects of metal exposition on the development, growth, and physiology of different plants exposed to this type of stress [97, 98].
Physiological and biochemical parameters are essential to understand the processes involved in the detoxification strategies employed by the plants during heavy metal stress. Some of them could be used as indirect indicators of the status of the phytoremediation process. In this work
The plant could grow without great problems, accumulating high concentrations of both metals so it could be used in phytoremediation programs as a phytostabilization species, and parameters such as proline content, relative conductivity, and dry weight could be used to monitor the phytoremediation process.
This study was financial supported by the National Agency for Scientific and Technological Promotion of Argentina (PICT-2016-2535), National University of La Plata (UNLP), and National University of the Northwest of the Buenos Aires Province (UNNOBA). The authors like to thank Laura Wahnan (CONICET) and Cecilia Bernardelli (CONICET) for technical assistance.
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