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Effects of Plant Growth Regulators and Sugars on the α-Amylase Activity in Cotyledons of Germinating Vigna angularis Seeds
분야 자연과학 > 기타(자연과학)
저자 (Jung Hee Hong)
발행기관 한국환경과학회
간행물정보 ENVIRONMENTAL SCIENCES 1998년, 제2권 제2호, 159~168쪽(총10쪽)
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보문 (報文) : 보리종자에서 α - Amylase 유도에 미치는 Dimethipin 의 영향 ( Articles : Effect of Dinethipin on the α - Amylase Induction in Barley Seeds )
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Effect of plant growth regulators and end-product on the enzyme activities in cotyledons of Vigna angularis during germination was investigated by measuring the changes of α-amylase activities in attached and detached cotyledons applied growth regulators and sugars. The higher levels of α-amylase in detached cotyledons than those in cotyledons attached to the embryonic axis were due to both faster synthesis and slower degradation of the enzyme in the detached cotyledons than in the attached cotyledons. Levels of α-amylase activity were reduced by high concentrations of glucose and sucrose, and it is suggested that this effect was caused mostly by osmotic stress and partly by end-product repression. In detached cotyledons exogenously supplied GA₃, IAA, kinetin, or their combinations has a small promotive effect on the developmental patterns of α-amylase activity. ABA and uniconazole both prevented the synthesis of α-amylase. Glucose inhibition of enzyme activity was partly reversed by the application of GA₃ and cAMP. GA₃ and cAMP seemed to act through a similar mechanism. The addition of inhibitors of protein and RNA synthesis largely prevented the increase of enzyme activity in the presence or absence of exogenous GA₃. The pretreatment experiments with canavanine indicated that the earlier the time of addition was, the lower the amylase activity was.
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