Rice Science ›› 2017, Vol. 24 ›› Issue (1): 41-47.DOI: 10.1016/j.rsci.2016.07.004

• Orginal Article • Previous Articles     Next Articles

Molecular Screening of Blast Resistance Genes in Rice Germplasms Resistant to Magnaporthe oryzae

Yan Liang1, Bai-yuan Yan2, Yun-liang Peng3, Zhi-juan Ji1, Yu-xiang Zeng1, Han-lin Wu1, Chang-deng Yang1()   

  1. 1State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou 310006, China
    2The Seed Management Station of Jiande, Jiande 311600, China
    3Institute of Plant Protection, Sichuan Academy of Agricultural Sciences / Key Laboratory of Integrated Pest Management on Crops in Southwest China, Ministry of Agriculture, Chengdu 610066, China
  • Received:2016-05-04 Accepted:2016-07-03 Online:2017-01-10 Published:2016-11-01

Abstract:

Molecular screening of major rice blast resistance genes was determined with molecular markers, which showed close-set linkage to 11 major rice blast resistance genes (Pi-d2, Pi-z, Piz-t, Pi-9, Pi-36, Pi-37, Pi5, Pi-b, Pik-p, Pik-h and Pi-ta2), in a collection of 32 accessions resistant to Magnaporthe oryzae. Out of the 32 accessions, the Pi-d2 and Pi-z appeared to be omnipresent and gave positive express. As the second dominant, Pi-b and Piz-t gene frequencies were 96.9% and 87.5%. And Pik-h and Pik-p gene frequencies were 43.8% and 28.1%, respectively. The molecular marker linkage to Pi-ta2 produced positive bands in eleven accessions, while the molecular marker linkage to Pi-36 and Pi-37 in only three and four accessions, respectively. The natural field evaluation analysis showed that 30 of the 32 accessions were resistant, one was moderately resistant and one was susceptible. Infection types were negatively correlated with the genotype scores of Pi-9, Pi5, Pi-b, Pi-ta2 and Pik-p, although the correlation coefficients were very little. These results are useful in identification and incorporation of functional resistance genes from these germplasms into elite cultivars through marker-assisted selection for improved blast resistance in China and worldwide.

Key words: rice, blast resistance gene, field evaluation, marker-assisted selection