关键词: 高海拔, 粳稻, 产量构成, 差异分析

Abstract: The yield components of high altitude japonica rice in different altitude areas were analyzed. The results showed that the phenotype of yield components and its correlation coefficients and path coefficients with yield were significantly different. The seed setting rate （132.39%）, the effective panicles （113.78%） are more sensitive to latitude, follows by 1000-grain weight （106.78%）, while the total grains per panicle（102.29%） is relatively stable. The main reasons for lower yield of japonica rice at high altitude are mainly due to the decline in seed setting rate and effective panicles. Therefore, we can choose the japonica varieties, which seed setting rate and effective panicles are low sensitive to latitude, to improve the yield stability at high altitude region.

Key words: high altitude, japonica rice, yield components, variance analysis