转基因抗虫杂交棉亲本间遗传距离与杂种优势的相关性研究

Studies on Relationship between Genetic Distance of Parents and Heterosis in Insect Resistant Transgenic Hybrid Cotton

利用6个优异纤维品质陆地棉品种与5个转基因抗虫棉品种杂交配制30个F1,研究转基因抗虫杂交棉亲本间遗传距离与杂种优势的相关性。结果表明:11个亲本间的遗传距离介于0.72～8.32,平均遗传距离为4.38,不同地理来源及表型差异的品种间遗传距离较大,聚类分析将11个品种分成5种类型。亲本间遗传距离与比强度的杂种优势值呈显著正相关,与全生育期、单株铃数、单铃重、衣分、产量性状的杂种优势值呈负相关,与株高、果枝数、籽指、纤维长度、马克隆值的杂种优势值呈正相关,但上述性状均未达到显著水平。

Thirty cross combinations were made between six supper fiber varieties and five insect resistant transgenic varieties.The relationship between genetic distance of parents and mid-parent heterosis were analyzed.The result showed that the genetic distance among 11 cotton cultivars ranged from 0.72 to 8.32 with an average genetic distance of 4.38.The genetic distances among cotton varieties with different geographical origins and phenotype were high.Eleven cotton varieties were classified into five clusters by the cluster analysis.The positive correlation between genetic distance of parents and fiber strength heterosis was significant at a level of 0.05.The negative correlations between genetic distance and mid-parent heterosis were found for growth period,bolls per plant,boll weight,lint percentage and lint yield.The positive correlations between genetic distance and mid-parent heterosis existed for plant height,fruit branches per plant ,seed index,fiber length and macronaries.But the correlations of above traits were not significant statistically.