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Genetic dissection of top three leaf traits in rice using progenies from a japonica × indica cross

Journal of Integrative Plant Biology 2017年第12期59卷 866-880页

作者： Changbin Yin Huihui Li Zhigang Zhao Zhiquan Wang Shijia Liu Liangming Chen Xi Liu Yunlu Tian Juan Ma Lidong Xu Dashuang Zhang Susong Zhu Danting Li Jianmin Wan Jiankang Wang The National Key Facility for Crop Gene Resources and Genetic Improvement and Institute of Crop ScienceChinese Academy of AgriculturalSciencesBeijing 100081China National Key Laboratory for Crop Genetics and Germplasm Enhancement Research Center of Jiangsu Plant Gene EngineeringNanjingAgricultural UniversityNanjing 210095China Rice Research Institute Jiangxi Academy of Agricultural SciencesNanchang 330200China Rice Research Institute Guizhou Academy of Agricultural SciencesGuiyang 550006China Rice Research Institute Guangxi Academy of Agricultural SciencesNanning 530007China

The size of the top three leaves of rice plants is strongly associated with yield; thus, it is important to consider quantitative traits representing leaf size （e.g., length and width） when breeding novel rice varieties. It is challenging to measure such traits on a large scale in the field, and little is known about the genetic factors that determine the size of the top three leaves. In the present study, a population of recombinant inbred lines （RILs） and reciprocal single chromosomal segment substitution lines （SSSLs） derived from the progeny of a japonica Asominori x indica IR24 cross were grown under four diverse environmental conditions. Six morphological traits associated with leaf size were measured,namely length and width of the flag, second and third leaves. In the RIL population, 49 QTLs were identified that clustered in 30 genomic region. Twenty-three of these QTLs were confirmed in the SSSL population. A comparison with previously reported genes/QTLs revealed eight novel genomic regions that contained uncharacterized ORFs associated with leaf size. The QTLs identified in this study can be used for marker- assisted breeding and for fine mapping of novel genetic elements controlling leaf size in rice.

关键词： indica cross Genetic dissection of top three leaf traits in rice using progenies from a japonica RIL

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