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| Effect of Environment and Genetic Recombination on Subspecies and Economic Trait Differentiation in the F2 and F3 Generations from indicajaponica Hybridization |
| WANG He-tong, JIN Feng, JIANG Yi-jun, LIN Qing-shan, XU Hai, CHENG Ling, XIA Ying-jun, LIU Chun-xiang, CHEN Wen-fu , XU Zheng-jin |
1.Rice Research Institute, Shenyang Agricultural University, Shenyang 110010, P.R.China
2.Rice Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510000, P.R.China
3.Agricultural Technology Extension Station, Department of Agriculture of Guangdong Province, Guangzhou 510000, P.R.China |
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摘要 indica and japonica are the two most important subspecies of Asian cultivated rice. Identifying mechanisms responsible for population differentiation in these subspecies is important for indica-japonica hybridization breeding. In this study, subspecies and economic trait differentiation patterns were analyzed using morphological and molecular (InDel and Intron Length Polymorphism) data in F2 and F3 populations derived from indica-japonica hybridization. Populations were grown in Liaoning and Guangdong provinces, China, with F3 populations generated from F2 populations using bulk harvesting (BM) and single-seed descent methods (SSD). Segregation distortion was detected in F3-BM populations, but not in F3- SSD or in F2 populations. Superior performance was observed with respect to economic traits in Liaoning compared with that in Guangdong and 1 000-grain weight (KW), seed setting rate (SSR) and grain yield per plant (GYP) were significantly correlated with indica and japonica subspecies types. Analysis of molecular and morphological data demonstrated that the environment is the main factor giving rise to population differentiation in indica-japonica hybridization. In addition, we also found that KW, SSR and GYP are related to subspecies characteristics and kinship, which is possibly a significant factor resulting in economic trait differentiation and determining environmental adaptability. Our study has provided new insights into the process of population differentiation in these subspecies to inform indica-japonica hybridization breeding.
Abstract indica and japonica are the two most important subspecies of Asian cultivated rice. Identifying mechanisms responsible for population differentiation in these subspecies is important for indica-japonica hybridization breeding. In this study, subspecies and economic trait differentiation patterns were analyzed using morphological and molecular (InDel and Intron Length Polymorphism) data in F2 and F3 populations derived from indica-japonica hybridization. Populations were grown in Liaoning and Guangdong provinces, China, with F3 populations generated from F2 populations using bulk harvesting (BM) and single-seed descent methods (SSD). Segregation distortion was detected in F3-BM populations, but not in F3- SSD or in F2 populations. Superior performance was observed with respect to economic traits in Liaoning compared with that in Guangdong and 1 000-grain weight (KW), seed setting rate (SSR) and grain yield per plant (GYP) were significantly correlated with indica and japonica subspecies types. Analysis of molecular and morphological data demonstrated that the environment is the main factor giving rise to population differentiation in indica-japonica hybridization. In addition, we also found that KW, SSR and GYP are related to subspecies characteristics and kinship, which is possibly a significant factor resulting in economic trait differentiation and determining environmental adaptability. Our study has provided new insights into the process of population differentiation in these subspecies to inform indica-japonica hybridization breeding.
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Received: 19 November 2012
Accepted:
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| Fund: This study was supported by the National Natural Science Foundation of China (30971845). |
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Corresponding Authors:
XU Zheng-jin, Tel: +86-24-88487183, E-mail: xuzhengjin@126.com
E-mail: xuzhengjin@126.com
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| About author: WANG He-tong, E-mail: tony.w.china@gmail.com |
Cite this article:
WANG He-tong, JIN Feng, JIANG Yi-jun, LIN Qing-shan, XU Hai, CHENG Ling, XIA Ying-jun, LIU Chun-xiang, CHEN Wen-fu , XU Zheng-jin.
2014.
Effect of Environment and Genetic Recombination on Subspecies and Economic Trait Differentiation in the F2 and F3 Generations from indicajaponica Hybridization. Journal of Integrative Agriculture, 13(1): 18-30.
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