Plant hormone-mediated regulation of stress responses

By Vivek Verma, Pratibha Ravindran, Prakash P. Kumar. BMC Plant Biology, 2016

1,777 citations recorded by the source corpus.

Being sessile organisms, plants are often exposed to a wide array of abiotic and biotic stresses. Abiotic stress conditions include drought, heat, cold and salinity, whereas biotic stress arises mainly from bacteria, fungi, viruses, nematodes and insects. To adapt to such adverse situations, plants have evolved well-developed mechanisms that help to perceive the stress signal and enable optimal growth response. Phytohormones play critical roles in helping the plants to adapt to adverse environmental conditions. The elaborate hormone signaling networks and their ability to crosstalk make them ideal candidates for mediating defense responses. Recent research findings have helped to clarify the elaborate signaling networks and the sophisticated crosstalk occurring among the different hormone signaling pathways. In this review, we summarize the roles of the major plant hormones in regulating abiotic and biotic stress responses with special focus on the significance of crosstalk between different hormones in generating a sophisticated and efficient stress response. We divided the discussion into the roles of ABA, salicylic acid, jasmonates and ethylene separately at the start of the review. Subsequently, we have discussed the crosstalk among them, followed by crosstalk with growth promoting hormones (gibberellins, auxins and cytokinins). These have been illustrated with examples drawn from selected abiotic and biotic stress responses. The discussion on seed dormancy and germination serves to illustrate the fine balance that can be enforced by the two key hormones ABA and GA in regulating plant responses to environmental signals. The intricate web of crosstalk among the often redundant multitudes of signaling intermediates is just beginning to be understood. Future research employing genome-scale systems biology approaches to solve problems of such magnitude will undoubtedly lead to a better understanding of plant development. Therefore, discovering additional crosstalk mechanisms among various hormones in coordinating growth under stress will be an important theme in the field of abiotic stress research. Such efforts will help to reveal important points of genetic control that can be useful to engineer stress tolerant crops.

Subfields: Molecular Biology, Plant Science

View Paper: https://www.semanticscholar.org/paper/c25574060c68ffea415d9166fd8ff5404f73c500

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Citations in the corpus

Regulation of Plant Responses to Salt Stress (2021, background): “Under high-salinity conditions, the increase in endogenous ABA levels causes stomatal closure to regulate water balance and osmotic homeostasis [67].”
Impact of Climate Change on Crops Adaptation and Strategies to Tackle Its Outcome: A Review (2019, background): “Salicylic acid regulations in these events might be secondary because they control the production of further plant stress-responsive hormones [108,109].”
Nanoparticle-Based Sustainable Agriculture and Food Science: Recent Advances and Future Outlook (2020, background): “Plant hormones play a vital role during external stress conditions and confer better adaptation to different changing environmental scenarios (Verma et al., 2016; Raza et al., 2019).”
Cadmium stress in plants: A critical review of the effects, mechanisms, and tolerance strategies (2020, background): “Plant roots have direct contact with soil-derived PTEs and are considered the first platform where metal detoxification is effectuated (Singh, Parihar et al., 2015).”
Heat and Drought Stresses in Crops and Approaches for Their Mitigation (2018, background): “…jasmonic acid and other factors (eg. nitrogen, pH) that have been shown to be involved in the regulation of physiological processes through their action as signal molecules in signaling networks (Nakashima and Yamaguchi-Shinozaki, 2013; Mittler and Blumwald, 2015; Verma et al., 2016).”
The effects of climate change associated abiotic stresses on maize phytochemical defenses (2018, background): “The interactions between stress signaling pathways have been the focus of extensive scientific studies and reviews (Fujita et al. 2006, 2009; Robert-Seilaniantz et al. 2011; Atkinson and Urwin 2012; Rejeb et al. 2014; Foyer et al. 2016; Verma et al. 2016).”
Jasmonic Acid in Plant Abiotic Stress Tolerance and Interaction with Abscisic Acid (2021, background): “For example, ABA biosynthetic genes and cellular ABA levels increased in response to JA, and conversely, expression of JA biosynthetic genes and cellular JA levels increased in response to ABA [19,20].”
The Role of Stress-Responsive Transcription Factors in Modulating Abiotic Stress Tolerance in Plants (2020, background): “Plant stress hormones, such as abscisic acid (ABA) and jasmonic acid (JA), regulate plant abiotic stress responses [4,5].”
Relationship of Melatonin and Salicylic Acid in Biotic/Abiotic Plant Stress Responses (2018, background): “In both cases (melatonin and SA), the role in some of these processes may be indirect because they modulate the synthesis and/or signaling of other plant hormones [25,26] (see below).”