Plant hormone-mediated regulation of stress responses

BMC Plant Biology

Review

Prakash P. Kumar¹  Pratibha Ravindran¹  Vivek Verma² 

[1] Department of Biological Sciences, Faculty of Science, National University of Singapore, 117543, Singapore, Singapore;Department of Biological Sciences, Faculty of Science, National University of Singapore, 117543, Singapore, Singapore;Present address: School of Biological and Biomedical Sciences, Durham University, South Road, DH1 3LE, Durham, UK;

关键词: Abiotic stress;    Biotic stress;    Plant hormones;    Crosstalk;    Abscisic acid (ABA);    Gibberellins (GA);    Salicylic acid (SA);    Jasmonates (JA);   

DOI  :  10.1186/s12870-016-0771-y

 received in 2015-12-02, accepted in 2016-04-06,  发布年份 2016

来源: Springer

【 摘 要 】

BackgroundBeing 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.ResultsRecent 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.ConclusionsThe 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.

【 授权许可】

CC BY   
© Verma et al. 2016