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- Title
Rice Pi5-Mediated Resistance to Magnaporthe oryzae Requires the Presence of Two Coiled-Coil-Nucleotide-Binding-Leucine-Rich Repeat Genes.
- Authors
Sang-Kyu Lee; Mm-Young Song; Young-Su Seo; Hye-Kyung Kim; Seho Ko; Pei-Jian Cao; Jung-Pil Suh; Gihwan Yi; Jae-Hwan Roh; Sichul Lee; Gynheung An; Tae-Ryong Hahn; Guo-Liang Wang; Pamela Ronald; Jong-Seong Jeon
- Abstract
Rice blast, caused by the fungus Magnaporthe olyzae, is one of the most devastating diseases of rice. To understand the molecular basis of Pi5-mediated resistance to M. oryzae, we cloned the resistance (R) gene at this locus using a map-based cloning strategy. Genetic and phenotypic analyses of 2014 F2 progeny from a mapping population derived from a cross between IR50, a susceptible rice cultivar, and the RIL260 line carrying Pi5 enabled us to narrow down the Pi5 locus to a 130-kb interval. Sequence analysis of this genomic region identified two candidate genes, Pi5-1 and Pi5-2, which encode proteins carrying three motifs characteristic of Rgenes: an N-terminal coiled-coil (CC) motif, a nucleotide-binding (NB) domain, and a leucine-rich repeat (LRR) motif. In genetic transformation experiments of a susceptible rice cultivar, neither the Pi5-J nor the Pi5-2 gene was, found to confer resistance to M. oryzae. In contrast, transgenic rice plants expressing both of these genes, generated by crossing transgenic lines carrying each gene individually, conferred Pi5-mediated resistance to M. oryzae. Gene expression analysis revealed that Pi5-1 transcripts accumulate after pathogen challenge, whereas the Pi5-2 gene is constitutively expressed. These results indicate that the presence of these two genes is required for rice Pi5-mediated resistance to M. oryzae.
- Publication
Genetics, 2009, Vol 181, Issue 4, p1627
- ISSN
0016-6731
- Publication type
Academic Journal
- DOI
10.1534/genetics.108.099226