Phytohormone-regulated beta-amylase gene expression in rice

The expression of beta-amylase genes in rice (Oryza sativa) and its regulation by phytohormones gibberellic acid (GA) and abscisic acid (ABA) were examined. Upon germination beta-amylase is synthesized de novo in aleurone cells and (GA) is not required. Exogenous addition of GA does not enhance the...

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Bibliographic Details
Published in:Plant molecular biology 1996-08, Vol.31 (5), p.975-982
Main Authors: Wang, S.M. (Academia Sinica, Taipei (Taiwan). Inst. of Molecular Biology), Lue, W.L, Eimert, K, Chen, J
Format: Article
Language:English
Subjects:
ABA
Abscisic Acid - pharmacology
ACIDO GIBERELICO
ARN MENSAJERO
ARN MESSAGER
BETA AMILASA
BETA AMYLASE
beta-Amylase - biosynthesis
beta-Amylase - genetics
Edible Grain - genetics
EXPRESION GENICA
EXPRESSION DES GENES
GENE EXPRESSION
Gene Expression Regulation, Enzymologic
Gene Expression Regulation, Plant
GERMINACION
GERMINATION
Germination - drug effects
GIBBERELLINE
Gibberellins - pharmacology
GRAINE
MESSENGER RNA
Oryza - drug effects
Oryza - enzymology
Oryza - genetics
ORYZA SATIVA
Plant Growth Regulators - pharmacology
RNA, Messenger - analysis
SEEDS
SEMILLA
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Summary:The expression of beta-amylase genes in rice (Oryza sativa) and its regulation by phytohormones gibberellic acid (GA) and abscisic acid (ABA) were examined. Upon germination beta-amylase is synthesized de novo in aleurone cells and (GA) is not required. Exogenous addition of GA does not enhance the beta-amylase activity, while ABA inhibits the beta-amylase activity, mRNA accumulation, and the germination of rice seeds. GA can reverse ABA inhibition of beta-amylase expression, but not ABA inhibition of seed germination. Such regulation represents a new interaction of ABA and GA.
ISSN:0167-4412
1573-5028
DOI:10.1007/BF00040716