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Arabidopsis RSS1 mediates cross-talk between glucose and light signaling during hypocotyl elongation growth

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Title Arabidopsis RSS1 mediates cross-talk between glucose and light signaling during hypocotyl elongation growth
 
Creator Singh, Manjul
Gupta, Aditi
Singh, Dhriti
Khurana, Jitendra P.
Laxmi, Ashverya
 
Subject Plant signalling
Plant physiology
Arabidopsis
Light Signaling
Glucose
RSS1 Mediates Cross-Talk
 
Description Accepted date: 09 November 2017
Plants possess exuberant plasticity that facilitates its ability to adapt and survive under challenging environmental conditions. The developmental plasticity largely depends upon cellular elongation which is governed by a complex network of environmental and phytohormonal signals. Here, we report role of glucose (Glc) and Glc-regulated factors in controlling elongation growth and shade response in Arabidopsis. Glc controls shade induced hypocotyl elongation in a dose dependent manner. We have identified a Glc repressed factor REGULATED BY SUGAR AND SHADE1 (RSS1) encoding for an atypical basic helix-loop-helix (bHLH) protein of unknown biological function that is required for normal Glc actions. Phenotype analysis of mutant and overexpression lines suggested RSS1 to be a negative regulator of elongation growth. RSS1 affects overall auxin homeostasis. RSS1 interacts with the elongation growth-promoting proteins HOMOLOG OF BEE2 INTERACTING WITH IBH 1 (HBI1) and BR ENHANCED EXPRESSION2 (BEE2) and negatively affects the transcription of their downstream targets such as YUCs, INDOLE-3-ACETIC ACID INDUCIBLE (IAAs), LONG HYPOCOTYL IN FAR-RED1 (HFR1), HOMEOBOX PROTEIN 2 (ATHB2), XYLOGLUCAN ENDOTRANSGLUCOSYLASE/HYDROLASES (XTHs) and EXPANSINS. We propose, Glc signals might maintain optimal hypocotyl elongation under multiple signals such as light, shade and phytohormones through the central growth regulatory bHLH/HLH module.
Tis work was fnancially supported by the grants received from Department of Biotechnology, Ministry of
Science and Technology, Government of India (BT/PR12855/BPA/118/87/2015) and NIPGR core grant. Funding to M.S. (DST/INSPIRE/04/2016/000634) and A.G. (DST/INSPIRE/04/2015/001952) comes from the INSPIRE faculty award of Department of Science and Technology, Government of India. We thank the National Institute of Plant Genome Research (NIPGR) Central Instrument facility (Real Time PCR division) for their assistance. We thank Dr. Zhiyong Wang for providing us with HBI1-Ox, IBH1-Ox lines and we thank Dr. Jaume Martínez García for providing us with bee1bee2bee3 triple mutant seeds.
 
Date 2017-11-27T06:24:18Z
2017-11-27T06:24:18Z
2017
 
Type Article
 
Identifier Scientific Reports, 7(1): 16101
2045-2322
http://223.31.159.10:8080/jspui/handle/123456789/803
https://www.nature.com/articles/s41598-017-16239-y
10.1038/s41598-017-16239-y
 
Language en_US
 
Format application/pdf
 
Publisher Nature Publishing Group