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Drought stress responses and signal transduction in plants

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Title Drought stress responses and signal transduction in plants
 
Creator Lata, Charu
Muthamilarasan, Mehanathan
Prasad, Manoj
 
Subject Abscisic acid
Cross talk
Drought
Gene expression
Signal transduction
Transcription factors
 
Description Nature provides all necessary components for healthy growth and development of plants in the form of air, water, light, nutrients, and soil. Any imbalance in the environmental harmony may cause stress to them. Stresses encountered by plants can broadly be categorized into biotic and abiotic stresses. Biotic stresses are mainly caused by pathogens and herbivory, whereas abiotic stresses include the threat imposed by drought, salinity, and extremes of temperature, heavy metals, and pollution. Drought stress is a major cause of yield instability in crops across diverse eco-geographic regions worldwide. A variety of biochemical, molecular, and physiological changes are manifested by plants in response to drought stress. The cellular abscisic acid (ABA) concentration increases on water deficit leading to the activation of a number of stress-responsive genes and the patterns of expression of these genes are very complex, with some genes being induced early while others respond slowly. In general, drought-responsive genes respond to salt and cold stresses as well as to exogenous ABA treatment. However, there are several genes, which express themselves in an ABA-independent manner suggesting that both ABA-dependent and -independent signal transduction cascades exist for drought stress perception, response, and adaptation. Drought stress response and adaptation in plants involves an array of pathways for signal perception, transduction, gene expression and synthesis of proteins, and other stress metabolites. Drought-responsive genes can mainly be classified into two groups. First group constitutes genes whose products provide osmotolerance and protection to plants thus directly functioning in tolerance to stress, while the second group includes genes playing a role in signal transduction as well as regulation of gene expression. This chapter summarizes the complex molecular mechanisms of drought stress response and adaptation in plants, highlighting the transcriptional regulation of stress-responsive gene expression. It also focuses on the recent advances in analyzing various stress-responsive pathways with prime emphasis on ABA-dependent and -independent pathways.
 
Date 2016-01-14T09:55:33Z
2016-01-14T09:55:33Z
2015
 
Type Book chapter
 
Identifier In: Pandey GK (ed), Elucidation of Abiotic Stress Signaling in Plants: Functional Genomics Perspectives. Springer Science, New York, USA, pp 195-225
978-1-4939-2540-7
http://172.16.0.77:8080/jspui/handle/123456789/541
http://link.springer.com/chapter/10.1007/978-1-4939-2540-7_7
10.1007/978-1-4939-2540-7_7
 
Language en_US
 
Publisher Springer