High-resolution mapping and characterization of xa42, a resistance gene against multiple xanthomonas oryzae pv. Oryzae races in rice (oryza sativa l.)

Constantine Busungu, Satoru Taura, Jun Ichi Sakagami, Toyoaki Anai, Katsuyuki Ichitani

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Improvement of resistance against rice bacterial blight (BB) disease is an important breeding strategy in breeding programs across the world, especially in Africa and southern Asia where BB is more prevalent. This report describes a high-resolution map and characterization of xa42 at XA42 locus, a rice BB resistance gene in XM14, a mutant line originating from IR24. The candidate gene region was narrowed down from 582 kb, which had been obtained in our previous study, to 57 kb. XM14 shows brown spots in its leaves like lesion mimic mutants. This line also shows a shorter stature than the original cultivar IR24. In XA42 gene segregating populations, homozygotes of xa42 allele were consistently resistant to the six Japanese Xanthomonas oryzae pv. oryzae races used for this study. They also showed brown spots and markedly short stature compared with the other genotypes, suggesting that xa42 gene exhibits pleiotropic effects.

Original languageEnglish
Pages (from-to)188-199
Number of pages12
JournalBreeding Science
Volume68
Issue number2
DOIs
Publication statusPublished - 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

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