Analysis of Heterosis in Inter-subspecific Hybrids F1 Among Different Types of Rice

Abstract

Abstract: Five types of rice, early season indica rice (EI), medium season indica rice (MI), early season japonica rice (EJ), medium season japonica rice (MJ), late season japonica rice (LJ), were used to make five sets of incomplete diallel crosses including EI/EJ, EI/MJ, EI/LJ, MI/MJ, MI/LJ. The results of heterosis analysis showed that stronger degree of heterosis over both mid-and better-parent based on population means in plant height, flag leaf length, panicle length, spikelet number of main panicle. The predicted genotype values of F₁ hybrids showed that EI/LJ and MI/LJ plants were too high and heading too late, but EI/EJ heading too early and panicle too small, and MI/MJ and EI/MJ showed better agronomic characters than others. Analysis of dominant correlation of traits revealed positive correlations among plant height, days to heading, flag leaf length, main panicle length and spikelet number of main panicle.

Key words: dominant correlation, heterosis, indica/japonica hybrid, predicted genotype value

摘要： 对早籼／早粳、早籼／中粳、早籼／晚粳、中籼／中粳和中籼／晚粳五种配组方式不完全双列杂交的杂种优势分析表明，株高、剑叶长、主穗长和主穗总粒数等性状的群体平均优势和群体超亲优势较强，Ｆ１性状平均基因型值预测认为，早籼／晚粳和中籼／晚粳杂种株高过高和抽穗偏迟，早籼／早粳配组生育期过短和穗小粒少，综合性状以中籼／中粳和早籼／中粳方式较为优良。Ｆ１性状间显性相关分析表明五种配组方式在株高、抽穗天数、剑叶长、主穗长和主穗总粒数五个性状间均存在显著的正相关，籼粳杂种表现的德大粒多同时伴有植株偏高、抽穗延迟和剑叶过披等倾向，但这种关联性在早籼／早粳或中籼／中粳配组中程度相对较低。

关键词: 籼粳交, 杂种优势, 基因型值预测, 显性相关

Shen Shengquan,Xue Qingzhong. Analysis of Heterosis in Inter-subspecific Hybrids F1 Among Different Types of Rice[J]. Chinese Journal of Rice Science.

沈圣泉, 薛庆中. 不同光温反应型配组的籼粳交F₁杂种优势的研究[J]. 中国水稻科学.

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