LI Can-dong.Evaluation of Density-Tolerance in Soybean Germplasm Resources and Screening of Its Identification Indexes[J].Soybean Science,2020,39(05):688-695.[doi:10.11861/j.issn.1000-9841.2020.05.0688]
大豆种质资源耐密性评价及鉴定指标筛选
- Title:
- Evaluation of Density-Tolerance in Soybean Germplasm Resources and Screening of Its Identification Indexes
- Keywords:
- Soybean; Density-tolerance; Principal components analysis; Membership function method; Stepwise regression analysis method
- 文献标志码:
- A
- 摘要:
- 为对大豆耐密性进行评价，分析不同资源材料耐密特性，建立大豆耐密性评价模型，以147份大豆资源群体为试验材料，以高密度与常规密度下各耐密性状比值的耐密指数为基础数据，通过主成分分析、隶属函数分析和逐步回归分析方法，对大豆耐密性进行综合评价及鉴定指标筛选。结果表明：通过主成分分析将9个耐密单项指标转换为4个独立综合指标，性状累计贡献率为85.24%，通过隶属函数法计算用于综合耐密评价的D值，筛选强耐密型大豆材料20份、弱耐密材料20份，通过逐步回归建立大豆耐密性评价数学模型，D=0.223-0.110X1-0.085X2-0.053X3-0.040X4+0.116X8+0.203X9，R2=0.983 0，估计精度在89.20%以上；筛选了6个核心耐密评价性状，分别为倒伏级别、植株重心高度、株高、底荚高、单株粒重及小区产量，可以作为大豆品种耐密性鉴定指标。
- Abstract:
- In order to research the methods of evaluating density-tolerance,analyze the density-tolerance of different soybean germplasm resources, and establish amathematical evaluation model of density-tolerance, this research took 147 soybean germplasm resources as the test materials, and used the density tolerance coefficient, which were the ratio of different densification traits under high density and normal density as basic data. We took evaluation and determination of evaluation indicators of density-tolerance had been done by the analytical methods of the principal component analysis, membership function method, and stepwise regression analysis. The results showed that the 9 single density-tolerance indexes were transformed into 4 independent comprehensive components through principal component analysis, which represent 85.24% cumulative contribution rate. The membership function method was employed to calculate comprehensive density-tolerance value (D), and 20 high density-tolerance materials and 20 low density-tolerance materials were selected. A mathematical evaluation model for soybean density-tolerance was established by stepwise regression analysis, D=0.223-0.110X1-0.085X2-0.053X3-0.040X4+0.116X8+0.203X9(R2=0.983 0), which accuracy was higher than 89.20%. Six indexes closely related to the density-tolerance were screened out, including the level of lodging, the height of plant gravity center, plant height, bottom pod height, the weight of seeds per plant and area yield. The research results laid a theoretical foundation for the breeding of density-tolerance soybean variety and germplasm resource evaluation.
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