Abstract
AbstractDistribution of components of maize starches from several endosperm mutants sampled at three stages of development were investigated by gel filtration after debranching by isoamylase. The waxy (wx) starches consisted of only amylopectin, and the distribution of components did not change during development. In other starches: normal, amylose‐extender (ae), dull (du), sugary‐1 (su1) and sugary‐2 (su2) starches, amylose contents increased during the 20–35 days after pollination (DAP) period of development. The ae, du, su1 and su2 mutants produced high‐amylose starches, while amylopectin of su2 was normal type and those of ae, du and su1 were novel type, and ae starches possessed longer average chain‐lengths of amylopectin. Phytoglycogens were prepared from su1 kernels during development and their characteristics were compared with those of su1 starches. The characteristics of phytoglycogens did not change during the developmental phase studied and the average chain‐lengths of phytoglycogens were shorter than those of amylopectin of su1 starches at each stage of development.
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