摘要: The effect of in situ water stress on the endogenous abscisic acid (ABA) content endosperm and vitro application ABA some important yield regulating processes wheat have been studied. Water resulted a marked increase at time close to cessation growth. Application culture medium detached ears reduced grain weight. Exogenously applied ABA, highest concentration (0.1 mM) transport sucrose into grains lowered starch synthesis ability intact grains. In uptake conversion by isolated was stimulated low concentrations (0.001 but inhibited higher concentrations. had no synthase (SS) uridine diphosphate glucose pyrophosphorylase (UDP-Gppase) activities, whereas adenosine (ADP-Gppase), soluble (SSS), granule-bound (GBSS) activities were reduced. These results raise possibility that stress-induced elevated levels contribute
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