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Global profiling of phytohormone dynamics during combined drought and pathogen stress in Arabidopsis thaliana reveals ABA and JA as major regulators

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Title Global profiling of phytohormone dynamics during combined drought and pathogen stress in Arabidopsis thaliana reveals ABA and JA as major regulators
 
Creator Gupta, Aarti
Hisano, Hiroshi
Hojo, Yuko
Matsuura, Takakazu
Ikeda, Yoko
Mori, Izumi C.
Senthil-Kumar, Muthappa
 
Subject Arabidopsis thaliana
phytohormone dynamics
Drought and Pathogen Stress
 
Description Accepted date: 5 May 2017
Global transcriptome studies demonstrated the existence of unique plant responses under combined
stress which are otherwise not seen during individual stresses. In order to combat combined stress
plants use signaling pathways and ‘cross talk’ mediated by hormones involved in stress and growth
related processes. However, interactions among hormones’ pathways in combined stressed plants
are not yet known. Here we studied dynamics of different hormones under individual and combined
drought and pathogen infection in Arabidopsis thaliana by liquid chromatography-mass spectrometry
(LC-MS) based profiling. Our results revealed abscisic acid (ABA) and salicylic acid (SA) as key regulators
under individual drought and pathogen stress respectively. Under combined drought and host pathogen
stress (DH) we observed non-induced levels of ABA with an upsurge in SA and jasmonic acid (JA)
concentrations, underscoring their role in basal tolerance against host pathogen. Under a non-host
pathogen interaction with drought (DNH) stressed plants, ABA, SA and JA profiles were similar to those
under DH or non-host pathogen alone. We propose that plants use SA/JA dependent signaling during
DH stress which antagonize ABA biosynthesis and signaling pathways during early stage of stress. The
study provides insights into hormone modulation at different time points during combined stress.
Projects at M.S.-K. lab are supported by National Institute of Plant Genome Research core funding and DBTRamalingaswami
re-entry fellowship grant (BT/RLF/re-entry/23/2012). M.S.-K. and H.H. acknowledge the
funding from international joint collaborative project on ‘multiple stress tolerance’ (2013–2015) from Okayama
University Institute of Plant Science and Resources (IPSR). Hormone analysis was performed in the program of
the Japan Advanced Plant Science Research Network, and its expenses were supported by funding from Ryobi
Teien Memory Foundation and IPSR International Joint Usage & Research Center Project. A.G. acknowledge
DBT-research associateship (DBT-RA/2014). We thank Mr. Sundar and Mr. Shobha Ram Valmiki for extending
technical help at the laboratory and CIF respectively.
 
Date 2017-06-13T07:54:03Z
2017-06-13T07:54:03Z
2017
 
Type Article
 
Identifier Scientific Reports, 7: 4017
2045-2322
http://59.163.192.83:8080/jspui/handle/123456789/754
https://www.nature.com/srep/
10.1038/s41598-017-03907-2
 
Language en_US
 
Publisher Nature Publishing Group