Rice Science ›› 2020, Vol. 27 ›› Issue (3): 237-245.DOI: 10.1016/j.rsci.2020.04.006

• Research Paper • Previous Articles     Next Articles

Identification of Major Locus Bph35 Resistance to Brown Planthopper in Rice

Yuexiong Zhang1,2, Gang Qin2, Qianqian Ma1, Minyi Wei2, Xinghai Yang2, Zengfeng Ma2, Haifu Liang2, Chi Liu2, Zhenjing Li2, Fang Liu1, Dahui Huang2(), Rongbai Li1()   

  1. 1College of Agriculture and State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530007, China
    2Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China
  • Received:2019-02-20 Accepted:2019-04-26 Online:2020-05-28 Published:2020-01-17
  • About author:

    # These authors contributed equally to this work

Abstract:

An introgression line RBPH660, derived from wild rice Oryza rufipogon, showed stable resistance to brown planthopper (BPH). Segregation analysis indicated BPH resistance of RBPH660 was controlled by multiple genes/QTLs. By using the bulked segregant analysis (BSA)-seq method, two genomic regions harboring QTLs resistance to BPH were identified from 1.20 to 16.70 Mb on chromosome 4 and from 10.20 to 12.60 Mb on chromosome 9 in RBPH660, respectively. A major resistance locus, designated as Bph35 accounting for 51.27% of the phenotypic variation with a LOD score of 42.51, was mapped to the candidate region of chromosome 4 between InDel (insertion-deletion) markers PSM16 and R4M13. For fine mapping of Bph35, one simple sequence repeat and three newly developed InDel markers were used to screen the recombinants. Finally, the Bph35 locus was delimited in the region from 6.28 to 6.93 Mb and there were 18 predicted protein-encoding genes with a total of 114 non-synonymous single nucleotide polymorphism (SNP) variant sites between the resistant and susceptible parents. Out of these genes, Os04g0193950, encoding a putative NB-ARC (nucleotide- binding adaptor shared by APAF-1, R proteins and CED-4) and LRR (leucine-rich repeat) domain protein with nine non-synonymous SNP substitutions in its coding sequence regions, might be the candidate gene for Bph35. These findings would facilitate the map-based cloning of the Bph35 gene and development of resistant varieties against BPH in rice.

Key words: rice, brown planthopper, Bph35, bulked segregant analysis (BSA)-seq method, gene mapping