广东农业科学2026，Vol.53Issue(4)：11-20,10.DOI:10.16768/j.issn.1004-874X.2026.04.002
36个甘蓝型油菜品系主要农艺性状遗传多样性综合分析
Comprehensive Analysis on Genetic Diversity of Key Agronomic Traits of 36 Brassica napus L.Lines
摘要
Abstract
[Objective]Analyze the genetic variation range and diversity level of key agronomic traits in Brassica napus L.lines,establish a comprehensive multi-trait evaluation system,and screen elite lines with high yield and superior quality.[Method]Taking 36 B.napus L.as research materials,eight key agronomic traits including plant height,branch position,number of primary effective branches,effective silique number per plant,seed number per silique,silique length,1000-seed weight and yield per plant were investigated via descriptive statistics,correlation analysis,cluster analysis and principal component analysis.In addition,the comprehensive membership function score D was standardized via the min-max normalization method to obtain the standardized value D'.[Result]The eight key agronomic traits of the tested lines exhibited abundant variation,with coefficients of variation ranging from 8.05％to 32.21％.The coefficient of variation of effective silique number per plant was the highest at 32.21％,followed by yield per plant with a coefficient of variation of 30.47％.Plant height had the lowest coefficient of variation of 8.05％.The eight key agronomic traits of the test lines exhibited rich genetic diversity,with the genetic diversity indices ranging from 1.75 to 2.13.Branch position had the highest genetic diversity index at 2.13.Correlation analysis indicated that plant height was extremely significantly moderate positively correlated with branch position.The number of primary effective branches showed an extremely significant strong positive correlation with effective silique number per plant,while the latter had an extremely significant moderate negative correlation with 1000-seed weight.Cluster analysis results divided 36 B.napus lines into three groups.Group Ⅰ consisted of high-yield lines,including 9 lines and accounting for 25％of the total.Group Ⅱ was mainly composed of dwarf and low-yield lines,including 17 lines and accounting for 47.22％of the total.Group Ⅲ primarily included conventional lines,including 10 lines and accounting for 27.78％of the total.Four principal components were extracted via principal component analysis with a cumulative contribution rate of 81.271％,namely silique number factor,biological yield factor,seed number per silique factor and 1000-seed weight factor.The D'values of the 36 B.napus lines ranged from 0.00 to 1.00,with lines Y15 and Y18 possessing the highest D'values.[Conclusion]Group Ⅰ featured the highest effective silique number per plant and seed number per silique.Elite lines Y15 and Y18 were classified into this group,suggesting that raising these two traits is a key strategy for high-yield breeding in B.napus.关键词
甘蓝型油菜/品系/农艺性状/聚类分析/主成分分析/隶属函数法/遗传多样性Key words
Brassica napus L./lines/agronomic traits/cluster analysis/principal component analysis/membership function method/genetic diversity分类
农业科技引用本文复制引用
卢丽娜,陈维,王涛,卢平,饶蔷薇,陈红艳..36个甘蓝型油菜品系主要农艺性状遗传多样性综合分析[J].广东农业科学,2026,53(4):11-20,10.基金项目
贵州省全省重点实验室-粮油作物优质高效增产研究项目(黔科合平台ZSYS[2025]037) （黔科合平台ZSYS[2025]037）
