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Plant Physiol, April 2000, Vol. 122, pp. 1179-1186
Abscisic Acid Inhibition of Radicle Emergence But Not Seedling
Growth Is Suppressed by Sugars1
Ruth R.
Finkelstein* and
Tim J.
Lynch
Department of Molecular, Cellular, and Developmental Biology,
University of California, Santa Barbara, California 93106
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 mM 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.
1
T.J.L. was supported by the U.S. Department of
Agriculture (grant no. 95-37304-2217).
*
Corresponding author; e-mail finkelst{at}lifesci.ucsb.edu; fax
805-893-4724.
© 2000 American Society of Plant Physiologists
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