Abstract
Trichoderma spp. have been the most common fungi applied as biological control agents (BCA) as an effort to combat a wide range of plant diseases. Its uses have recorded good success rate in controlling major plant diseases. Knowledge on the mechanisms employed by Trichoderma spp. could be further studied to improve its ability as an efficient biocontrol agent. The Trichoderma ability to curb plant diseases were mainly based on the activation of single or multiple control mechanisms. It is known that the Trichoderma-based biocontrol mechanisms mainly rely on mycoparasitism, production of antibiotic and/or hydrolytic enzymes, competition for nutrients, as well as induced plant resistance; numerous secondary metabolites produced by Trichoderma species could directly inhibit the growth of several plant pathogens. These mechanisms may act directly or indirectly against the targeted plant pathogen. This chapter reviews the recent updates on published research findings on mechanisms used by Trichoderma as biological control of plant diseases particularly on basal stem rot disease of oil palm caused by Ganoderma spp.
Keywords
- antibiosis
- competition
- induced resistance
- mycoparasitism
- secondary metabolite
1. Introduction
1.1. Biological control of oil palm basal stem rot disease caused by Ganoderma boninense
Many promising biological antagonists, mainly from
Biological control of BSR disease in oil palm can be effectively achieved through the utilization of an effective strain of
2. Mechanisms of Trichoderma species
2.1. Mycoparasitism
The potential of
Considerable research work has been done to identify and understand the enzymes induced by
Three important
2.2. Promoting plant growth
Microbial organisms colonize a plant’s root system and at the same time play a beneficial role in biological control, protecting the plant from soil-borne pathogens as well stimulating plant growth [13]. These beneficial relationships between plants and microbes often occur in the rhizosphere, improving plant growth or helping the plant overcome biotic or abiotic stresses [24].
2.3. Induced resistance in plants
Apart from
The secondary metabolites 6-pentyl-α-pyrone and harzionalide produced by
2.4. Antibiosis
Some exert antimicrobial effects at high doses, but others act as microbe-associated molecular patterns (MAMPs), while auxin-like compounds act at low concentrations. For example, even 1 ppm of 6-pentyl-α-pyrone, harzianolide, or harzianopyridone can activate a plant’s defense system and regulate growth in plants (e.g., tomato, canola, and pea) [49]. Many elicitors released by
2.5. Competition
This is a classical mechanism of biological control of plant pathogens [65]. Competition among microorganisms occurs only when resources such as soil nutrients and space are limited. In this situation, antagonistic microbes produce secondary metabolites capable of inhibiting or slowing growth and other activities of pathogenic fungi, thus conferring ecological advantages over its competitors. Antagonistic microbes utilize available resources for growth, leaving pathogens with insufficient nutrients for its growth and consequently starved [66]. These antagonists favorably compete for iron causing the suppression of
Reduced nutrient concentrations lead to reduced conidial germination, slowed germ tube growth of a pathogen, reduced number of infection sites, and the extent of plant disease development [70].
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