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Plant responses to combined drought and pathogen infection: current understanding on the role of phytohormones

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Title Plant responses to combined drought and pathogen infection: current understanding on the role of phytohormones
 
Creator Pandey, Prachi
Senthil-Kumar, Muthappa
 
Subject Combined stress
Drought
Pathogen infection
Phytohormonal signaling
Cross talk
Abscisic acid
Salicylic acid
Jasmonic acid
Stress elicitors
 
Description Accepted date: 1st February 2017
Plants under natural conditions encounter a number of abiotic and biotic stresses often being inflicted simultaneously. Plant responses to a stress are governed by intricate network of the hormone signaling pathways. Abscisic acid (ABA) forms the major component of the plant response to drought and cold stress. Salicylic acid (SA), jasmonic acid (JA), and ethylene act as key regulators of plant response to pathogen infection. In fact, the extensive cross talk among the different hormone-mediated signaling pathways determines plant response to a particular stress. A large number of studies focus on hormone signaling under individual drought and pathogen stresses and the cross talk between the two stress responses. However, owing to the relatively few studies on combined drought and pathogen stresses, our understanding of phytohormonal signaling under combined stress is still obscure. Recent studies on combined drought and pathogen infection indicate that plants when simultaneously exposed to the two stresses often exhibit a transcriptional and metabolic response different from that exhibited under single stress conditions. This is also applicable to the phytohormonal signaling. The nature, time, and severity of the two stresses in combination modulate hormonal concentrations as well as the hormone signal transduction pathways involved. In this chapter, we provide a compendious description of the role of the three major hormones, namely, ABA, SA, and JA, in combined drought and pathogen infection. A brief description of the role of auxins, cytokinins, and gibberellins has also been provided. Taking leads from few studies, we have discussed the potential role of hormones in conferring combined drought and pathogen stress tolerance to plants. We also briefly discussed the effect of different “stress elicitors” on hormone signaling.
Combined stress tolerance-related projects at MS-K Lab are supported by
the National Institute of Plant Genome Research core funding and the DBT-Ramalingaswami Reentry
Fellowship grant (BT/RLF/re-entry/23/2012) and the DBT-Innovative Young Biotechnologist
award. PP acknowledges DST-SERB Young Scientist grant (SB/YS/LS-71/2014) for the financial
support.
 
Date 2017-04-13T10:38:39Z
2017-04-13T10:38:39Z
2017
 
Type Book chapter
 
Identifier In: Senthil-Kumar M (ed), Plant Tolerance to Individual and Concurrent Stresses, Springer (India) Pvt. Ltd., pp 133-149
978-81-322-3706-8
http://59.163.192.83:8080/jspui/handle/123456789/734
https://link.springer.com/chapter/10.1007%2F978-81-322-3706-8_9
10.1007/978-81-322-3706-8_9
 
Language en_US
 
Publisher Springer