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Glucose control of root growth direction in Arabidopsis thaliana

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Title Glucose control of root growth direction in Arabidopsis thaliana
 
Creator Singh, Manjul
Gupta, Aditi
Laxmi, Ashverya
 
Subject Arabidopsis
brassinosteroid
endocytosis
glucose
 
Description Accepted date: 3 March 2014
Directional growth of roots is a complex process that is modulated by various environmental signals. This work shows that presence of glucose (Glc) in the medium also extensively modulated seedling root growth direction. Glc modulation of root growth direction was dramatically enhanced by simultaneous brassinosteroid (BR) application. Glc enhanced BR receptor BRASSINOSTEROID INSENSITIVE1 (BRI1) endocytosis from plasma membrane to early endosomes. Glc-induced root deviation was highly enhanced in a PP2A-defective mutant, roots curl in naphthyl phthalamic acid 1-1 (rcn1-1) suggesting that there is a role of phosphatase in Glc-induced root-growth deviation. RCN1, therefore, acted as a link between Glc and the BR-signalling pathway. Polar auxin transport worked further downstream to BR in controlling Glc-induced root deviation response. Glc also affected other root directional responses such as root waving and coiling leading to altered root architecture. High light intensity mimicked the Glc-induced changes in root architecture that were highly reduced in Glc-signalling mutants. Thus, under natural environmental conditions, changing light flux in the environment may lead to enhanced Glc production/response and is a way to manipulate root architecture for optimized development via integrating several extrinsic and intrinsic signalling cues.
This work was supported by the Department of Biotechnology, Ministry of
Science and Technology, Government of India (BT/PR3302/AGR/02/814/2011),
an NIPGR core grant, and research fellowships from the Council of Scientific
and Industrial Research, India (to M.S. and A.G.). The authors are thank-
ful to the National Institute of Plant Genome Research (NIPGR) Central
Instrumentation Facility (Real-time PCR Division) and Confocal Imaging
Facility for their assistance. They are also thankful to Confocal Imaging facility,
Department of Plant Molecular Biology, University of Delhi for their assistance.
 
Date 2015-12-29T09:58:50Z
2015-12-29T09:58:50Z
2014
 
Type Article
 
Identifier J. Exp. Bot., 65(12): 2981-2993
1460-2431
http://172.16.0.77:8080/jspui/handle/123456789/465
http://jxb.oxfordjournals.org/content/65/12/2981
10.1093/jxb/eru146
 
Language en_US
 
Publisher Oxford University Press