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alpha-Amylase activity increased in attached cotyledons of germinated Vigna mungo seeds until the 5th day after imbibition and decreased thereafter, whereas in detached and incubated cotyledons the activity continuously increased and, at the 6th day, reached the value more than three times that of the maximum activity of attached cotyledons. Zymograms of the activities and Ouchterlony double immunodiffusion test on the activities of attached and detached cotyledons showed that the increase of activity in detached cotyledons was due to the identical enzyme as in attached tissues. alpha-Amylase contents, determined by single radial immunodiffusion method, changed in parallel with enzyme activity in both attached and detached cotyledons, which also suggested the de novo synthesis of alpha-amylase in V. mungo cotyledons.The rate of incorporation of the label from [(3)H]leucine into alpha-amylase and the ratios of dpm in alpha-amylase/dpm in trichloroacetic acid-insoluble fraction did not show significant difference between attached and detached cotyledons. The results indicated that in attached cotyledons fluctuation of alpha-amylase activity was regulated by both synthesis and degradation of the enzyme, whereas in detached cotyledons alpha-amylase was synthesized and accumulated, because of low degrading activity during incubation.

In Vivo Synthesis and Turnover of α-Amylase in Attached and Detached Cotyledons of Vigna mungo Seeds