The Differences of Grain Amylose Contents in Different Panicle Parts of Japonica Rice Variety

Amylose content (AC) is one of the most important criterions in rice quality. The AC varied among grains in the same panicle and even in different parts of the grain. This drfference can be reached by 14.2%. The AC of grains in the upper part or the first branches of the panicle and the early flowering grains or heavier grains were larger than others. The AC of the half grain with embryo was different from that without embryo among varieties. The AC with embryo side is, generally, larger than that of another side. AC of grains were also increased from outer layer to inner layer among different parts of milled rice. AC was, normally, enhanced by 1% while milled degree of rice was increased by 10%. It was better to choose the second or third or forth grains in the panicle branch to analyze the AC. The errors could be decreased by sampling some grains rather than one grain.