Relationship between molecular marker heterozygosity and hybrid performance in intra- and inter-subspecific crosses of rice

文献类型： 外文期刊

第一作者： Zhao, MF

作者： Zhao, MF;Li, XH;Yang, JB;Xu, CG;Hu, RY;Liu, DJ;Zhang, Q

作者机构：

关键词： Oryza sativa;hybrid rice;predicting heterosis;RFLP;wide-compatibility

期刊名称：PLANT BREEDING （ 影响因子：1.832； 五年影响因子：1.956 ）

ISSN： 0179-9541

年卷期： 1999 年 118 卷 2 期

页码：

收录情况： SCI

摘要： The objective of this study was to investigate the relationship between molecular marker diversity and heterosis in both intra-and inter-subspecific hybrids of rice to evaluate the feasibility of predicting hybrid performance using molecular markers. Eleven elite lines were intermated resulting in a diallel set including 10 indica x indica, 15 japonica x japonica and 30 indica x x japonica crosses. The F-1 hybrids and parents were evaluated for agronomic performance in a replicated field trial. The parental lines were tested for DNA polymorphisms with 113 restriction fragment length polymorphism (RFLP) probes covering the 12 rice chromosomes. Inter-subspecific crosses showed better performance and higher heterosis than intrasubspecific hybrids. Correlations of marker heterozygosity with hybrid performance and heterosis differed considerably between the two subspecies; they were higher in crosses within japonica subspecies than within indica ci subspecies. Very little correlation was detected in intersubspecific crosses. It was concluded that relationships between marker heterozygosity and hybrid performance were complex owing to germplasm diversity and the complexity of the genetic basis of heterosis. The implications of the results in predicting hybrid performance using molecular markers are discussed.

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