Abstract
Bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is a serious disease in rice production worldwide. To understand the genetic diversity of bacterial blight resistance a population consisting of 175 indica accessions from nine countries was collected and detected their association between SSR (Simple Sequence Repeat) markers and resistance to six bacterial races. The resistance phenotypes of various rice accessions were evaluated through artificial inoculation under controlled conditions in 2013 and 2014. Association analysis showed that 17 SSR markers were significantly associated with resistance to four bacterial races and the phenotypic variations explained (PVE) ranged from 7.43 to 15.05%. Among the 17 associated SSR markers, two SSR markers located in previously reported genes regions, and 15 SSR markers were newly identified in this study. These results validated a new approach to map resistance genes of rice to bacterial blight. These markers could be used for marker-assisted selection (MAS) in rice bacterial blight resistance breeding programs.
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Acknowledgements
This research has been supported by Grants from Special Fund for Agro-Scientific Research in the Public Interest (201303015), the National Key Project for Transgenic Crops (2016ZX08009-003-001, 2014ZX08009-001B), the Natural Science Foundation of China (30900888,31171516) and the Fundamental Research Funds for the Central Universities (KYZ201302), Jiangsu Agriculture science and technology inovation fund (CX(12)1003-3, CX(15)1054). We would like to thank Prof. Liu Fengquan for his kindly providing all the bacterial isolates.
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Hao Chen, Yunyu Wu and Jianbo He have contributed equally to this work.
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Chen, H., Wu, Y., He, J. et al. Population structure analysis and association mapping of bacterial blight resistance in indica rice (Oryza sativa L.) accessions. Plant Growth Regul 82, 21–35 (2017). https://doi.org/10.1007/s10725-016-0234-3
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DOI: https://doi.org/10.1007/s10725-016-0234-3