strong type
10.The content and the accumulated amount of amylose, amylopectin and total starch in strong grains and weak grains showed "S" type dynamic change. Amylose accumulating rate of strong grains reached its peak on 25-30th day after anthesis (DAA). The accumulation rate of amylopectin and total starch reached peaks on the same time, ie 20-25th DAA.

