Abstract
Bacterial blight caused by Xanthomonas oryzae pv. oryzae (Xoo) is the most harmful bacterial disease of rice worldwide. Previously, we characterized major disease resistance (MR) gene xa25, which confers race-specific resistance to Xoo strain PXO339. The xa25 is a recessive allele of the SWEET13 locus, but SWEET13’s interaction with PXO339 and how efficiently using this locus for rice breeding still need to be defined. Here we show that the SWEET13 allele from rice Zhenshan 97 is a susceptibility gene to PXO339. Using this allele’s promoter to regulate xa25 resulted in disease, suggesting that the promoter is a key determinant in SWEET13 caused disease in Zhanshan 97 after PXO339 infection. PXO339 transcriptionally induces SWEET13 to cause disease. Partial suppressing SWEET13 expression leads to a high level of resistance to PXO339. Thus, the transcriptionally suppressed SWEET13 functions as xa25 in resistance to PXO339. Hybrid rice is widely grown in many countries. However, recessive MR genes have not been efficiently used for disease resistance breeding in hybrid rice production for both parents of the hybrid have to carry the same recessive gene. However, the suppressed SWEET13 functions dominantly, which will have advantage to improve the resistance of hybrid rice to xa25-incomptible Xoo.
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This work was supported by the National Natural Science Foundation of China (31330062), and the National Key Research and Development Program of Chin (2016YFD0100903).
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Characterization of a disease susceptibility locus for exploring an efficient way to improve rice resistance against bacterial blight
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Cheng, Q., Mao, W., Xie, W. et al. Characterization of a disease susceptibility locus for exploring an efficient way to improve rice resistance against bacterial blight. Sci. China Life Sci. 60, 298–306 (2017). https://doi.org/10.1007/s11427-016-0299-x
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DOI: https://doi.org/10.1007/s11427-016-0299-x