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Abscisic Acid Negatively Regulates Expression of Chlorophyll A/b Binding Protein Genes During Soybean Embryogeny

Overview
Journal Plant Physiol
Specialty Physiology
Date 1991 Nov 1
PMID 16668519
Citations 18
Authors
Y C Chang
L L Walling
Affiliations
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Abstract

The levels of abscisic acid (ABA) during embryogenesis in the soybean (Glycine max) cultivar Dare were quantitated. An increase in the quantity of ABA per cotyledon was correlated with a decrease in the chlorophyll a/b binding (Cab) protein gene mRNA population. Soybean cotyledons were cultured in vitro in the presence or absence of ABA. Quantitation of cotyledonary ABA levels and Cab mRNA levels indicated that the application of 5 x 10(-5) molar and 5 x 10(-6) molar exogenous ABA decreased Cab mRNA prevalences. S1 nuclease protection experiments demonstrated that exogenous ABA modulated the level of Cab3 mRNA. These data strongly suggest that one of the developmental regulators of Cab gene expression during soybean embryogeny is the plant hormone, ABA; ABA negatively regulates Cab mRNA accumulation.

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