Genetic variation in resistance to blast (Pyricularia oryzae Cavara) in rice (Oryza sativa L.) germplasms of Bangladesh

Mohammad Ashik Iqbal Khan, Mohammad Abdul Latif, Mohammad Khalequzzaman, Asami Tomita, Mohammad Ansar Ali, Yoshimichi Fukuta

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Genetic variation in blast resistance was clarified in 334 Bangladesh rice accessions from 4 major ecotypes (Aus, Aman, Boro and Jhum). Cluster analysis of polymorphism data of 74 SSR markers separated these accessions into cluster I (corresponding to the Japonica Group) and cluster II (corresponding to the Indica Group). Cluster II accessions were represented with high frequency in all ecotypes. Cluster II was further subdivided into subclusters IIa and IIb. Subcluster IIa accessions were represented with high frequency in only Aus and Jhum ecotypes. Cluster I accessions were more frequent in the Aman ecotype than in other ecotypes. Distinct variations in resistance were found, and accessions were classified into 4 groups (A1, A2, B1 and B2) based on their reactions to standard differential blast isolates. The most susceptible group was A2 (which included susceptible variety Lijiangxintuanheigu, most of the differential varieties, and a few Bangladesh acces-sions), followed in order by A1, B2 and B1 (the most resistant). Accessions from 4 ecotypes fell with different frequencies into each of these resistance groups. These results demonstrated that Japonica Group accessions were found mainly in Aman, and Indica Group accessions were distributed across all ecotypes. Susceptible accessions were limited in Aus and Aman.

Original languageEnglish
Pages (from-to)493-499
Number of pages7
JournalBreeding Science
Issue number5
Publication statusPublished - 2017
Externally publishedYes


  • Blast (Pyricularia oryzae Cavara)
  • Ecotype
  • Genetic variation
  • Resistance
  • Rice (Oryza sativa L.)

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science


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