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《Chinese Journal of Rice Science》 2019-01
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Origin, Distribution and Sequence Diversity of Rice Blast Resistance Locus LABR_64 in Rice

DENG Yufei;LIU Minghao;WANG Dan;ZUO Shimin;KANG Houxiang;WANG Guoliang;Agricultural College, Hunan Agricultural University;State Key Laboratory for Biology of Plant Diseases and Insect Pest/Institute of Plant Protection, Chinese Academy of Agricultural Sciences;Key Laboratory of Plant Functional Genomics, Ministry of Education/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University;Department of Plant Pathology, Ohio State University;  
【Objective】 A better understanding of the origin and distribution of disease resistance genes in rice germplasm is useful for breeding highly resistant varieties.【Method】We analyzed sequence diversity of the rice blast resistance locus LABR_64, which contains two homologous genes, LABR_64-1 and LABR_64-2, is located in the allelic region of Pi3/Pi5/Pii/Pi15 on rice chromosome 9. In addition, we analyzed the microsynteny of the LABR_64 orthologous region in different monocotyledons.【Result】The presence frequency(PF) of LABR_64 is 16%. All of the japonica rice cultivars carrying LABR_64 are highly resistant to rice blast and all of those without the locus are susceptible. In addition, the PF of LABR_64 in the indica subpopulation is lower than 5%. Although LABR_64 is correlated with the resistance to rice blast, many indica rice cultivars without LABR_64 are also resistant to rice blast. We also found that the LABR_64-2 sequence is much conserved. Moreover, the microsynteny analysis of the LABR_64 orthologous region in different monocotyledons indicated that LABR_64 originates after the separation of the monocotyledonous and dicotyledonous species, and at the early differentiation stage of monocotyledons.【Conclusion】The rice blast resistance phenotypes are closely correlated with the presence of the LABR_64 locus in japonicasubpopulation, but not in indica, indicating that there are many other resistance loci in the indica subpopulation. The LABR_64-2 sequence can be used for developing molecular markers in marker-assisted rice blast resistance breeding. It also indicated that LABR_64 may play a role in disease resistance in different monocotyledons.
【Fund】: 国家自然科学基金国际合作重点项目(31461143019);; 江苏省农业重大新品种创制项目(PZCZ201703)
【CateGory Index】: S435.111.41
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【Citations】
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