山东大豆品种耐荫性评价及鉴定指标筛选OA

To select shade-tolerant soybean varieties suitable for intercropping systems in Shandong Prov-ince,Qihuang 34 and other 15 newly released soybean varieties from the past three years in Shandong Province were treated by shading in field.The key agronomic traits at maturity and the yield of the 16 soybean varieties were systematically measured.By using the principal component analysis,membership function analysis and cluster analysis,a comprehensive evaluation on shade tolerance of the tested varieties was conducted.The results showed that 10 agronomic traits could be integrated into three principal components based on the shade tolerance coefficient,and their cumulative contribution rate was 74.342％.Based on the comprehensive shade tolerance e-valuation value(D value),the 16 varieties could be classified into three shade tolerance levels:2 belonged to highly shade-tolerant type,5 belonged to moderately shade-tolerant type,and 9 belonged to weakly shade-toler-ant type.Ultimately,a shade tolerance evaluation model was constructed through multiple linear stepwise regres-sion analysis,and five agronomic traits including internode length,number of nodes,grain weight per plant,plot yield and 100-grain weight were selected as the evaluation indicators.The findings could not only offer the theoretical support and practical guidance for optimizing variety allocation in intercropping and relay cropping systems in Shandong Province,but also provide germplasm resources for the genetic improvement of soybean shade tolerance.