Arabidopsis RSS1 Mediates Cross-Talk Between Glucose and Light Signaling During Hypocotyl Elongation Growth. Issue 1 (December 2017)

• Record Type: Journal Article
• Authors: Singh, Manjul; Gupta, Aditi; Singh, Dhriti; Khurana, Jitendra; Laxmi, Ashverya
• Is Part Of: Scientific reports. Volume 7:Issue 1(2017)
• Page Start: 1
• Page End: 18
• Publication Date: 2017-12
• Subjects: Natural history -- Research -- Periodicals; Biology -- Research -- Periodicals; Physical sciences -- Research -- Periodicals; Earth sciences -- Research -- Periodicals; Environmental sciences -- Research -- Periodicals; 502.85
• DOI: 10.1038/s41598-017-16239-y
• Languages: English
• ISSNs: 2045-2322

Abstract

Abstract 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 factorREGULATED 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 asYUCs, INDOLE-3-ACETIC ACID INDUCIBLE (IAAs ), LONG HYPOCOTYL IN FAR-RED1 (HFR1 ), HOMEOBOX PROTEIN 2 (ATHB2 ), XYLOGLUCAN ENDOTRANSGLUCOSYLASE/HYDROLASES (XTHs ) andEXPANSINS . 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.