Breeding strategies for optimum heading date using genotypic information in rice
Breeding strategies for optimum heading date using genotypic information in rice
复制标题
利用水稻基因型信息实现最佳抽穗期的育种策略
DOI：
10.1007/s11032-009-9332-5
复制
发表时间：
2010-02-01
影响因子：
3.1
通讯作者：
Wan, Jianmin
中科院分区：
文献类型：
--
作者：
Wei, Xiangjin;Liu, Linglong;Wan, Jianmin
Heading date (HD) is a key trait for the adaptation of rice cultivar to a specific growing region. Here, we report conventional and marker-assisted breeding strategies using genetic information related to the determination of HD, where the breeding objectives were to avoid the delayed heading common inindica×japonicahybrids, to increase the efficiency in selecting hybrid rice combinations having a suitable growth duration, and to develop cultivars with target growth duration by quantitative trait locus (QTL) pyramiding. The allelic constitution at the major HD loci was determined for a set of 109 leading Chinese rice cultivars by crossing them with HD tester lines. It was shown that the late heading inindica×japonicahybrids can be overcome by replacing the strong photoperiod-sensitivity alleleSe-1nwithSe-1e. A breeding strategy to enable the selection of hybrid combinations with suitable growth duration was proposed, based on HD genotypic information in rice. Meanwhile, a QTL analysis for HD was conducted over five years based on a recombinant inbred line population, derived from two parents Asominori (japonica) and IR24 (indica). Four QTLs, located on chromosomes 2, 3, 6, and 8, respectively, could be detected in all five years, indicating they were stably expressed QTL. According to this QTL information, and taking Asominori as an example, the HD genotypes for improving the growth duration were designed, and the best breeding selection schemes were determined by use of a genetic breeding simulation tool. Results obtained in this study demonstrate that genetic information related to HD can make a significant contribution to rice breeding.
