Genetic mapping and chromosomal assignment of Magnaporthe oryzae avirulence genes AvrPik, AvrPiz, and AvrPiz-t controlling cultivar specificity on rice

Chao Xi Luo, Liang Fen Yin, Satomi Koyanagi, Mark L. Farman, Motoaki Kusaba, Hiroshi Yaegashi

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

A genetic map including three avirulence (Avr) genes, AvrPik, AvrPiz, and AvrPiz-t, was constructed in a genetic cross of two rice field isolates, 84R-62B and Y93-245c-2. The chromosomal locations of the Avr genes were determined by using selected markers to probe Southern blots of the parental chromosomes that had been separated by contour-clamped homogenous electric fields electrophoresis. Electrophoretic karyotyping showed that both parental isolates 84R-62B and Y93-245c-2 contained seven chromosomes greater than 3.5 megabases (Mb) in size and 84R-62B possessed a small chromosome of ≈1.6 Mb. The linkage groups containing AvrPiz and AvrPiz-t were assigned to chromosomes 3 and 7, respectively. Some markers from the linkage group that contained AvrPik hybridized with chromosome 1 and the 1.6-Mb chromosome, yet all of the cloned RAPD markers that were closely linked to AvrPik hybridized exclusively to the 1.6-Mb chromosome in 84R-62B, the parent that possesses AvrPik. Thus, we conclude that AvrPik is located on the 1.6-Mb chromosome in 84R-62B.

Original languageEnglish
Pages (from-to)640-647
Number of pages8
JournalPhytopathology
Volume95
Issue number6
DOIs
StatePublished - Jun 2005

Keywords

  • P. oryzae
  • Pyricularia grisea
  • Rice blast fungus

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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