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Title: | Multiple interactions between glucose and brassinosteroid signal transduction pathways in Arabidopsis are uncovered by whole-genome transcriptional profiling |
Authors: | Gupta, Aditi Singh, Manjul Laxmi, Ashverya |
Keywords: | Arabidopsis Glucose Brassinosteroid Signal Transduction Pathways Whole-Genome Transcriptional Profiling |
Issue Date: | 2015 |
Publisher: | American Society of Plant Biologists |
Citation: | Plant Physiol., 168(3): 1091-1105 |
Abstract: | Brassinosteroid (BR) and glucose (Glc) regulate many common responses in plants. Here, we demonstrate that under etiolated growth conditions, extensive interdependence/overlap occurs between BR- and Glc-regulated gene expression as well as physiological responses. Glc could regulate the transcript level of 72% of BR-regulated genes at the whole-genome level, of which 58% of genes were affected synergistically and 42% of genes were regulated antagonistically. Presence of Glc along with BR in medium could affect BR induction/repression of 85% of BR-regulated genes. Glc could also regulate several genes involved in BR metabolism and signaling. Both BR and Glc coregulate a large number of genes involved in abiotic/biotic stress responses and growth and development. Physiologically, Glc and BR interact to regulate hypocotyl elongation growth of etiolated Arabidopsis (Arabidopsis thaliana) seedlings in a dose-dependent manner. Glc may interact with BR via a hexokinase1 (HXK1)-mediated pathway to regulate etiolated hypocotyl elongation. Brassinosteroid insensitive1 (BRI1) is epistatic to HXK1, as the Glc insensitive2bri1-6 double mutant displayed severe defects in hypocotyl elongation growth similar to its bri1-6 parent. Analysis of Glc and BR sensitivity in mutants defective in auxin response/signaling further suggested that Glc and BR signals may converge at S-phase kinase-associated protein1-Cullin-F-box-transport inhibitor response1/auxin-related f-box-auxin/indole-3-acetic acid-mediated auxin-signaling machinery to regulate etiolated hypocotyl elongation growth in Arabidopsis. |
Description: | Accepted date: May 31, 2015 |
URI: | http://172.16.0.77:8080/jspui/handle/123456789/507 |
ISSN: | 1532-2548 |
Appears in Collections: | Institutional Publications |
Files in This Item:
File | Description | Size | Format | |
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Laxmi A_2015_4.pdf Restricted Access | 3.26 MB | Adobe PDF | View/Open Request a copy |
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