关键词: 水稻, 穗部性状, 品质性状, 穗型指数

Abstract: Using rice varieties bred recently in Liaoning as materials in this study. The results showed that the characters of panicle and characters of quality were significantly different among different varieties. It was advantageous to increase processing quality by increasing numbers of panicle and 1000-grian weight, and it was advantageous to improve the appearance qualities by increasing seed setting rate or that of secondary branch especially. The effects of high seed setting rate of secondary branch on processing qualities and appearance qualities or eating qualities were negative. It was put forward that using panicle trait index (PTI, the ratio between the number of axis internode whose number of grains of secondary branch was almost the primary branches and number of primary branch) to show the distribution characteristic of the number of grains of secondary branches on the axis. The PTI of these materials distributed between 0.29 and 0.61. These materials were classified into superior-on-the-upper-part type (SUT) and superior-on-the-middle-part type (SMT) or superior-on-the-lower-part type (SLP) according to the PTI. When the number of grains of secondary branches were superior on the middle or upper part, in other words the number of PTI was bigger, it is advantageous to increase not only the seed setting rate and yield but also improve quality.

Key words: Rice, Character of panicle, Quality character, Panicle trait index