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海岛棉杂交后代主要性状关系探讨及优异组合筛选

Discussion on the Relationship between the Main Traits of Gossypium barbadense Hybrids and the Screening of Excellent Combinations

  • 摘要: 以130个海岛棉杂交组合为试验材料,调查16个相关指标,通过相关性、主成分和回归分析探讨主要农艺性状、产量和纤维品质之间的关系,通过系统聚类筛选优良杂交材料。结果表明,皮棉产量和籽棉产量与株高、果枝数、有效果枝数和铃数正相关,与始节高和始节数负相关,同时纤维品质与产量间、纤维品质构成因素间都存在相互制约关系;对16个指标降维后提取5个主成分,分别命名为果枝因子、产量因子、上半部平均长度和整齐度决定因子、纤维品质因子和生长因子,共解释群体82.16%的变异;分别以产量性状和品质性状为因变量、主要农艺性状为自变量构建7个最佳回归模型,为适应不同需求快速准确地选择群体材料提供依据;对参试材料进行产量聚类和品质聚类,分别筛选出6个高产和10个优质杂交组合,杂交育种为遗传信息重组提供可能,亲本的特异选择有望实现这一育种目标。

     

    Abstract: 16 related indicators were investigated using 130 Gossypium barbadense hybrids as experimental materials, the relationship among main agronomic traits, yield and fiber quality was explored through correlation, principal component and regression analysis, and excellent hybrid materials were screened by systematic clustering. The results showed that lint yield and seed cotton yield were positively correlated with plant height, fruit branches, effective branches and bell number, and negatively correlated with the height of the initial section and the number of the first section, while there was a mutual constraint relationship between fiber quality and yield and fiber quality components. After dimensionality reduction of 16 indexes, five principal components were extracted, named fruit branch factor, yield factor, upper average length and uniformity determinant, fiber quality factor and growth factor, which explained 82.16% of the variation of the population. Seven optimal regression models were constructed with yield traits and quality traits as dependent variables and main agronomic traits as independent variables, which provided a basis for the rapid and accurate selection of group materials to meet different needs. Yield clustering and quality clustering of the test materials were carried out, and 6 high-yield and 10 high-quality hybrid combinations were screened respectively, and hybrid breeding provided the possibility for genetic information recombination, and the specific selection of parents was expected to achieve this breeding goal.

     

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