四川不同区域川油系列甘蓝型油菜品种主要性状与产量的相关分析.

[Objective] The present paper aimed to analyze the main factors affecting the yield of Brassica napus L in different regions of Sichuan province, so as to provide theoretical basis for breeding B. napus L. varieties suitable for different rapeseed producing areas in Sichuan province. [Method] Variation analysis, correlation analysis and path analysis were used to analyze the relationship between the agronomic characters and the yield of B. napus L . [Result] In Xindu, Deyang and Dazhou regions, the most variation of agronomic trait was the first branch numbers. The value was the number of seeds per siliquain Chongzhou and Mianyang regions. It was the number of effective siliqua per plant in Nanchang, Yibin, Jianyang, and Leshan regions. The least variation of agronomic traits was the plant hight, in the Xindu, Chongzhou, Jianyang, Mianyang, and Deyang regions. It was 1000-seed weight, in the Nanchang, Yibin, Leshan, and Dazhou regions. The yield of Xindu region was significant or highly significant negative correlated with the first branch numbers and the number of effective siliqua per plant But, it was significant positive correlated with the plant hight and the number of seeds per siliqua. The yield of Nanchang region was significant or highly significant positive correlated with the plant hight, the first branch numbers, and the number of effective siliqua per plant. The yield of Yibin region was highly significant positive correlated with the plant hight. The yield of Jianyang region was significant or highly significant positive correlated with the number of effective siliqua per plant and the number of seeds per siliqua. But, it was highly significant negative correlated with the 1000-seed weight. The yield of Leshan region was significant positive correlated with the number of effective siliqua per plant. There was no significant correlation between yield and main agronomic traits in Mianyang, Deyang, and Dazhou region. In Xindu region, the greatest direct path coefficient and the greatest comprehensive effects were respectively the number of seeds per siliqua and the the number of effective siliqua per plant. Those were both the number of seeds per siliqua in Chongzhou region. In Nanchong and Jianyang regions, the greatest direct path coefficient and the greatest comprehensive effects were respectively the number of seeds per siliqua and the 1000-seed weight. Those values were respectively the number of effective siliqua per plant and the first branch numbers in both Mianyang and Dazhou regions. In Deyang region, the greatest direct path coefficient and the greatest comprehensive effects were both the number of effective siliqua per plant. [Conclusion] There were differences in the coefficient of variation of main agronomic traits of B. napus L in different producing areas of Sichuan province, and there were differences in correlation with yield. The effects of yield components on yield should be fully considered in breeding, as well as the comprehensive effects of other traits. The present study provides a scientific basis for breeding B. napus L varieties suitable for different regions of Sichuan province. [ABSTRACT FROM AUTHOR]