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ÎÄÕÂÌâÄ¿£ºStarch metabolism and grain chalkiness under high temperature stress

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Starch is composed of two types of molecules: linear and helical amyloses containing ¦Á-1,4-glycosidic bonds, and branched amylopectins containing both ¦Á-1,4- and ¦Á-1,6-glycosidic bonds. In rice endosperm, amylose is synthesized mainly by granule-bond starch synthase I (GBSSI/Wx); whereas amylopectin is synthesized by the joint action of soluble starch synthases (SSs), starch branching enzyme (BEs) and debranching enzymes (DBEs) (Fig. 1). In this review, we reported the genetic components involved in grain chalkiness and the recent success in quantitative trait loci (QTL) study of grain chalkiness.

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