The rice cultivar Baixiangzhan harbours a recessive gene xa42(t) determining resistance against Xanthomonas oryzae pv. oryzae |
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| Authors: | Li Q Liang Cong Y Wang Lie X Zeng Wen J Wang Jin Q Feng Bing Chen Jing Su Shen Chen Fu D Shang Xiao Y Zhu Fei Lin |
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| Institution: | 1. Guangdong Provincial Key Laboratory of High Technology for Plant Protection, Plant Protection Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou, China;2. State Key Laboratory for Conservation and Utilization of Subtropical Agro‐bioresources, Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education, South China Agricultural University, Guangzhou, China |
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| Abstract: | Bacterial leaf blight (BB) is among the “top 3” diseases in rice production. Breeding resistant cultivars has been the most effective strategy for BB management. The inbred cultivar Baixiangzhan (BXZ) showed a broad spectrum of resistance to five Xoo pathotypes in China, including the prevalent and highly virulent Xoo pathotypes Chinese Race V (CV), which can overcome the resistance of Xa4 and Xa21. The resistance heredity of BXZ has been explored in this study. A single recessive major resistance gene, which designated as xa42(t), confers resistance against the tested Xoo pathotypes CV. Linkage analysis lands xa42(t) on chromosome 6, and genetic mapping confines it to 3.9 cM region flanked by RM20558/RM20547 and RM20580. A further seven markers were developed from this interval for high‐resolution mapping, and the xa42(t) locus was narrowed to 34.8 Kb segment bounded by RM20572 and DT46. The only functionally predicted gene included in the target region is LOC_Os06g45960 if based on the ‘Nipponbare’ reference sequence. This candidate gene is predicted to encode a cytochrome P450 protein. |
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| Keywords: | bacterial blight fine mapping recessive resistance gene xa42(t) |
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