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Interaction between glucose and brassinosteroid during regulation of lateral root development in Arabidopsis thaliana

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Title Interaction between glucose and brassinosteroid during regulation of lateral root development in Arabidopsis thaliana
 
Creator Gupta, Aditi
Singh, Manjul
Laxmi, Ashverya
 
Subject Arabidopsis
Brassinosteroid
Glucose
Lateral Root Development
 
Description Accepted date: March 19, 2015
Glucose (Glc) plays a fundamental role in regulating lateral root (LR) development as well as LR emergence. In this study, we show that brassinosteroid (BR) signaling works downstream of Glc in controlling LR production/emergence in Arabidopsis (Arabidopsis thaliana) seedlings. Glc and BR can promote LR emergence at lower concentrations, while at higher concentrations, both have an inhibitory effect. The BR biosynthesis and perception mutants showed highly reduced numbers of emerged LRs at all the Glc concentrations tested. BR signaling works downstream of Glc signaling in regulating LR production, as in the glucose insensitive2-1brassinosteroid insensitive1 double mutant, Glc-induced LR production/emergence was severely reduced. Differential auxin distribution via the influx carriers AUXIN RESISTANT1/LIKE AUXIN RESISTANT1-3 and the efflux carrier PIN-FORMED2 plays a central role in controlling LR production in response to Glc and BR. Auxin signaling components AUXIN RESISTANT2,3 and SOLITARY ROOT act downstream of Glc and BR. AUXIN RESPONSE FACTOR7/19 work farther downstream and control LR production by regulating the expression of LATERAL ORGAN BOUNDARIES-DOMAIN29 and EXPANSIN17 genes. Increasing light flux could also mimic the Glc effect on LR production/emergence. However, increased light flux could not affect LR production in those BR and auxin signaling mutants that were defective for Glc-induced LR production. Altogether, our study suggests that, under natural environmental conditions, modulation of endogenous sugar levels can manipulate root architecture for optimized development by altering its nutrient/water uptake as well as its anchorage capacity.
This work was supported by the Department of Biotechnology,
Ministry of Science and Technology, Government of India (grant no.
BT/PR3302/AGR/02/814/2011), by the National Institute of Plant
Genome Research, and by the Council of Scientific and Industrial
Research, India (research fellowships to A.G. and M.S.).
 
Date 2016-01-04T10:41:47Z
2016-01-04T10:41:47Z
2015
 
Type Article
 
Identifier Plant Physiol., 168(1): 307-320
1532-2548
http://172.16.0.77:8080/jspui/handle/123456789/506
http://www.plantphysiol.org/content/168/1/307.long
10.1104/pp.114.256313
 
Language en_US
 
Publisher American Society of Plant Biologists