Both drought and waterlogging resulted in decreases in the activities of sucrose synthase (SS) and granule-boundstarchsynthase (GBSS), and especially in that of soluble starch synthase (SSS).
The progress in research granule-boundstarchsynthase (GBSS) which was responsible for amylose synthesis in cereal endosperm, was reviewed in the paper.
The activity of soluble starchsynthase was 1. 3 times higher that that of the granule-boundstarchsynthase, corresponding to the ratio of amylopectin to amylose.