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The rice cultivar Baixiangzhan harbours a recessive gene xa42 ( t ) determining resistance against Xanthomonas oryzae pv. oryzae
Author(s) -
Liang Li Q.,
Wang Cong Y.,
Zeng Lie X.,
Wang Wen J.,
Feng Jin Q.,
Chen Bing,
Su Jing,
Chen Shen,
Shang Fu D.,
Zhu Xiao Y.,
Lin Fei
Publication year - 2017
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/pbr.12493
Subject(s) - xanthomonas oryzae , biology , xanthomonas oryzae pv. oryzae , locus (genetics) , genetics , cultivar , gene , oryza sativa , bacterial blight , gene mapping , chromosome , botany
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 RM 20558/ RM 20547 and RM 20580. 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 RM 20572 and DT 46. 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.