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Abscisic Acid Inhibition of Radicle Emergence But Not Seedling Growth Is Suppressed by Sugars

Abscisic Acid Inhibition of Radicle Emergence But Not Seedling Growth Is Suppressed by Sugars Low concentrations of sugars altered the sensitivity of seed germination to inhibition by exogenous abscisic acid (ABA). Germination of wild-type and ABA-insensitive ( abi ) Arabidopsis seeds was assayed on media containing ABA and a variety of sugars and sugar alcohols. The inhibitory effects of ABA were strongly repressed in the presence of 15 to 90 m m glucose (Glc), sucrose, or fructose, but not by comparable concentrations of sorbitol or mannitol. Several features of the response to Glc are inconsistent with a purely nutritional effect: The optimal sugar concentration is low and differs between the wild type and the abi mutants. Furthermore, Glc suppression of ABA inhibition is light dependent and limited to the process of radicle emergence. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Physiology American Society of Plant Biologist

Abscisic Acid Inhibition of Radicle Emergence But Not Seedling Growth Is Suppressed by Sugars

Plant Physiology , Volume 122 (4): 1179 – Apr 1, 2000

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References (44)

Publisher
American Society of Plant Biologist
Copyright
Copyright © 2011 by the American Society of Plant Biologists
ISSN
1532-2548
eISSN
0032-0889
DOI
10.1104/pp.122.4.1179
Publisher site
See Article on Publisher Site

Abstract

Low concentrations of sugars altered the sensitivity of seed germination to inhibition by exogenous abscisic acid (ABA). Germination of wild-type and ABA-insensitive ( abi ) Arabidopsis seeds was assayed on media containing ABA and a variety of sugars and sugar alcohols. The inhibitory effects of ABA were strongly repressed in the presence of 15 to 90 m m glucose (Glc), sucrose, or fructose, but not by comparable concentrations of sorbitol or mannitol. Several features of the response to Glc are inconsistent with a purely nutritional effect: The optimal sugar concentration is low and differs between the wild type and the abi mutants. Furthermore, Glc suppression of ABA inhibition is light dependent and limited to the process of radicle emergence.

Journal

Plant PhysiologyAmerican Society of Plant Biologist

Published: Apr 1, 2000

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