Abstract
Starch metabolism in rice endosperm of both the superior and inferior caryopses in the panicle was characterized by comparing changes in activities of five major enzymes associated with starch synthesis during endosperm development; sucrose synthase, ADPglucose pyrophosphorylase, Q-enzyme (starch branching enzyme), and soluble and starch granule-bound forms of starch synthase. Activities of ADPglucose pyrophosphorylase of both the superior and inferior caryopses increased markedly between 11 and 14 days after pollination. The developmental patterns of Q-enzyme activities were quite different between the superior and inferior caryopses. In addition, it was found that eight-14 days after pollination the activity of the starch granule-bound starch synthase in the inferior caryopsis was markedly lower than that in the superior caryopsis. These results suggest that the low activity of the granule-bound starch synthase is related to the lower content of amylose in the inferior caryopsis.
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