イネ穎花の穂上位置の違いと冷水温感受性

日本作物学会紀事

眞崎 聡¹  寺井 謙次²  小玉 郁子¹  杉浦 正典²  川本 朋彦¹  松本 眞一¹ 

[1] 秋田県農業試験場;秋田大学

关键词: Rice plants;    イネ;    Cool-weather tolerance;    耐冷性;    Grain position;    着粒位置;    Secondary rachis-branch;    2次枝梗;    Percentage of spikelet fertility;    稔実歩合;    Panicle type;    ç©‚åž‹;    Grain weight;    粒重;   

DOI  :  10.1626/jcs.73.204

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We examined the nodal distribution of the numbers of ripened and empty grains and the grain weight in the panicle in 12 rice cultivars with different cold tolerancecultivated in cool water(daily mean temperature, 19C). The number of grains including empty ones did not vary so much with the nodal position on the primary rachis-branches, but was high at the middle part on the secondary rachis-branches. This tendency was stronger in cold tolerant cultivars, and the number of ripened grain at each nodal position on the panicle was also higher in cold-tolerant cultivar. The nodal variation in grain weight was larger on the secondary than on the primary rachis-branches in all cultivars. On the secondary rachis-branches of the cold-tolerant cultivars, the lower the nodal position, the higher the fertility percentage, but the weight of each grain negatively correlated with the fertility percentage, In the cold-tolerant cultivars fertility percentage was higher in the order of lower>middle>upper pa of panicles, and in the order of tertiary>secondary>primary rachis-branches. This tendency was not clear in the cold-susceptible cultivars. Participation of assimilate transport from stems and leaves in the negative correlation between the fertility percentage and gain weight remains to be examined further.

【 授权许可】

Unknown