粳稻数量性状遗传距离与杂种优势的关系

摘要/Abstract

摘要： 研究粳稻资源分类方法，测定数量性状遗传距离，探讨数量性状遗传距离与杂种优势的关系。对30份粳稻资源材料的12个数量性状进行了主成分分析和聚类分析，并使用作图法研究了数量性状遗传距离与杂种优势指数之间的关系。30份粳稻资源的12个数量性状可归纳为5个主成分因子，其累积贡献率为86.84%。在评价粳稻种质资源时，首先应考虑每穗总粒数和每穗实粒数等穗粒因子，其次为群体具备一定的高峰苗数，最后应该协调植株的生育期、秧苗素质及株型等因子。30份粳稻资源被归为5组，地理远近和亲缘关系与遗传距离并不存在必然的联系。遗传距离与杂种优势的关系较为复杂，并非遗传距离越大杂种优势越明显。在进行粳稻资源评价时，不能以地理或亲缘关系作为唯一标准；在亲本选配时，应选择遗传距离中等偏大的材料。

关键词: 中国－东盟自由贸易区, 中国－东盟自由贸易区, 西部, 农业结构, 调整

Abstract: To grope categorizing method in japonica rice, and calculate the genetic distance of quantitative characters, and study the relationship between genetic distance and heterosis. The key components analysis and cluster analysis were performed for 12 quantitative characters of 30 japonica rice germplasms. Study of the relationship between genetic distance and heterosis were carried out by the graphics. 12 quantitative characters of 30 japonica rice germplasms were concluded to 5 main factors. The contribution of the 5 main factors to total variation of population studied accounted for 86.84%. During evaluating the japonica rice germplasms , the total number of grain per panicle and the number of the filled grain per panicle should be selected firstly. Then the maximum tiller number of the population should be chosen, and finally the growth stage and the vegetative character and the plant type etc. be adjusted. 30 japonica rice germplasms were classified into 5 groups. There wasn’t definite relationship among the geographic distance and the pedigree and the genetic distance. The relationship between the genetic distance and the teterosis was complicated. The largest genetic distance didn’t mean the best heterosis. To evaluate japonica rice germplasms, geography origin and pedigree shouldn’t be only depended on. Selecting parents with medium genetic distance may probably gain stronger heterosis.

中图分类号:

沈锦根,王玉娟. 粳稻数量性状遗传距离与杂种优势的关系[J]. 中国农学通报, 2007, 23(12): 216-216.

Shen Jingen, Wang Yujuan. Study of the Relationship between Genetic Distance and Heterosis in Japonica Rice[J]. Chinese Agricultural Science Bulletin, 2007, 23(12): 216-216.

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