Analysis of Rice Blast Fungus Genetic Diversity and Identification of a Novel Blast Resistance OsDRq12 Gene

Dan Dan Zhao, Hyunjung Chung, Yoon Hee Jang, Muhammad Farooq, Soo Yeon Choi, Xiao Xuan Du, Kyung Min Kim

Research output: Contribution to journalArticlepeer-review

Abstract

The rice blast fungus Magnaporthe oryzae poses a significant challenge to maintaining rice production. Developing rice varieties with resistance to this disease is crucial for its effective control. To understand the genetic variability of blast isolates collected between 2015 and 2017, the 27 monogenic rice lines that carry specific resistance genes were used to evaluate blast disease reactions. Based on criteria such as viability, virulence, and reactions to resistance genes, 20 blast isolates were selected as representative strains. To identify novel resistance genes, a quantitative trait locus analysis was carried out utilizing a mixture of the 20 representative rice blast isolates and a rice population derived from crossing the blast-resistant cultivar ‘Cheongcheong’ with the blast-susceptible cultivar ‘Nagdong’. This analysis revealed a significant locus, RM1227-RM1261 on chromosome 12, that is associated with rice blast resistance. Within this locus, 12 disease resistance-associated protein genes were identified. Among them, OsDRq12, a member of the nucleotide-binding, leucine-rich repeat disease resistance family, was chosen as the target gene for additional computational investigation. The findings of this study have significant implications for enhancing rice production and ensuring food security by controlling rice blast and developing resistant rice cultivars.

Original languageEnglish
Pages (from-to)1917-1925
Number of pages9
JournalPhytopathology
Volume114
Issue number8
DOIs
StatePublished - Aug 2024

Keywords

  • Magnaporthe oryzae
  • QTL
  • monogenic rice lines
  • rice
  • rice blast

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