Abstract
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 in indica × japonica hybrids, 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 in indica × japonica hybrids can be overcome by replacing the strong photoperiod-sensitivity allele Se-1 n with Se-1 e. 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.
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Acknowledgments
We are grateful to Drs K. Ichitani and M. Yano for provision of the testers EG0, EG1, ER, LR, and QTL NILs, to Dr Tsai Kuo Hai for the isogenic lines T65m and T65Ebm, to Professor A. Yoshimura, for his kindly providing us the RIL and CSSL populations and genotype data. This research is supported by grants from the 863 Program of China (2006AA100101, 2006BAD01A01-5, 2006BAD13B01), the National Natural Science Foundation of China (30871497), Jiangsu Science and Technology Development Program (BG2006301), Jiangsu Agricultural Germplasm Gene Pool Program (sx(2007)g02), and the 111 Project (B08025).
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Wei, X., Liu, L., Xu, J. et al. Breeding strategies for optimum heading date using genotypic information in rice. Mol Breeding 25, 287–298 (2010). https://doi.org/10.1007/s11032-009-9332-5
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DOI: https://doi.org/10.1007/s11032-009-9332-5