关键词: 早籼稻, 稻米品质, 分期播种, 变异分析, 相关分析

Abstract: In order to study rice quality and relationship among relevant characters affected by different snowing date, 11 early indica rice varieties which are the mainly cultivars update in the southern of China were chosen as materials, and 3 methods of variation, correlation, and canonical correlation analyses were applied. The results show that the range of quality traits' variation is different depending on the sowing date. The variant range of chalkiness is vast, followed by gel consistency and head rice rate, whereas of the length/width ratio of rice, it is narrow. Such results imply that better rice quality is to be achieved by selecting appropriate sowing data. The outcome from analysis of simple correlation indicates that there is significantly negative correlation between chalkiness and other quality characteristics, and highly positive correlation is simultaneity observed among the characteristics such as brown rice rate, milled rice rate, head rice rate, and gel consistency. The relationship between length/width ratio of rice and other characteristics is dim, however. Analysis of canonical correlation revealed that, with higher canonical loading caused by the greater variation, chalkiness, gel consistency, and alkali digested value occupy a prominent importance for grain quality. On the other hand, with lower loading because of the small variation, the ratio of rice length and width only expresses a subordinate effect, though it's one of the main components composing the rice appearance quality.

Key words: early indica rice, rice quality, interval sowing, analysis of variation, analysis of correlation