Plant hormones play a critical role in regulating plant developmental processes. Jasmonic acid, salicylic acid and brassinosteroids have been recently added to the list of plant hormones apart from auxins, gibberellins, cytokinins, abscisic acid and volatile hormone ethylene. Besides their regulatory role in plant development, plant hormones, ethylene, Jasmonic acid and salicylic acid play key roles in the plant defense response while as auxins, gibberellins, abscisic acid, cytokinins and brassinosteroids are known to modulate their effects. For an effective response to biotic stresses, the signaling pathways of different hormones are integrated at different levels enabling crosstalk between them. In this chapter, I will analyze how plant hormones signal defense response and interact with each other through crosstalk to regulate plant defense.
Part of the book: Plant Hormones
Agricultural productivity world over is threatened by abiotic stress, intensifying food security issues. The plant hormones play a significant role in mitigating abiotic stresses, including drought stress, salinity stress, heat stress, and heavy metal stress, faced by the plants. Considerable research has been conducted to understand hormone-mediated abiotic stress responses in plants and the underlying biosynthetic and regulatory pathways. Deciphering these pathways would allow their manipulation in the laboratory and possible extension to the field. In the present chapter, an overview of the role plant hormones play in mitigating abiotic stress, the underlying mechanisms of their action, and the cross-talk between their signaling pathways to mitigate abiotic stress is presented.
Part of the book: Abiotic Stress in Plants