粘糯杂交后代主要农艺性状遗传变异及相关性和主成分分析

Genetic Variation and Correlation Analysis of Main Agronomic Traits in Hybrid Offspring of Glutinous×Non-glutinous

[目的]分析粘糯杂交后代农艺性状的遗传变异,为选择植株性状与稻米品质兼优的粘糯杂交后代株系提供参考。[方法]采用相关分析和主成分分析等方法对粘糯交组合糯89-1/蜀恢527的F_2代株高、穗长、结实率、千粒重、有效穗数、每穗实粒数、每穗总粒数、着粒密度进行了研究。[结果] F_2代各农艺性状变异较大,除株高外,其他7个性状近似正态分布,株高、穗长、每穗总粒数、着粒密度表型值表现正向超亲优势;结实率与千粒重、每穗实粒数呈正相关,与株高呈负相关,千粒重与除着粒密度外的其他6个性状呈正相关;主成分分析将8个性状简化为4个主成分,即产量因子、结实率因子、有效穗数因子、千粒重因子,以上因子提供的信息量占总信息量的88.374%,能概括农艺性状的绝大部分信息。[结论]粘糯杂交后代农艺性状的遗传变异与籼粳交或品种间杂交相似。

[Objective] To analyze the genetic variation of the main agronomic traits in F 2 population of glutinous×non-glutinous, and to provide basis for selection of hybrid offspring with excellent agronomic traits and rice quality.[Method] Correlation analysis and principal component analysis were used to study the plant height, panicle length, seed setting rate, kilo-grains weight, effective panicle number, filled grain number per panicle, spikelet number per panicle and density of panicle of F 2 population of glutinous rice waxy cross 89-1 / Shuhui 527.[Result] The agronomic traits varied greatly in F 2 generation. Seven traits were normal distribution, except plant height. The plant height, panicle length, spikelet number per panicle, and density of panicle phenotype showed positive super-parents. The seed setting rate was positively correlated with kilo-grains weight and filled grain number per panicle, respectively, but negatively correlated with plant height. Kilo-grains weight was positively correlated with six traits except density of panicle. The principal component analysis reduced the eight traits to four principal components, i.e. yield factor, seed setting rate factor, effective panicle number factor and kilo-grains weight factor. The above four factor provided 88.374% of the total information, which covered most information of agronomic traits.[Conclusion] The genetic variation of agronomic traits in the offspring of glutinous×non-glutinous is similar to that of indica × japonica cross or cross between varieties.