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Author Huang,C.L., Hwang,S.Y., Chiang,Y.C. and Lin,T.P.
Title Molecular Evolution of Pi-ta Gene Resistance to Rice Blast in Wild Rice (Oryza rufipogon)
Rice blast disease resistance to the fungal pathogen Magnaporthe grisea is triggered by a physical interaction between the protein products of the host R (resistance) gene, Pi-ta, and the pathogen Avr (avirulence) gene, AVR-pita. The genotype variation and resistant/susceptible phenotype at the Pi-ta locus of wild rice (Oryza rufipogon), the ancestor of cultivated rice (O. sativa), was surveyed in 36 locations worldwide to study the molecular evolution and functional adaptation of the Pi-ta gene. The low nucleotide polymorphism of the Pi-ta gene of O. rufipogon was similar to that of O. sativa, but greatly differed from what has been reported for other O. rufipogon genes. The haplotypes can be subdivided into two divergent haplogroups named H1 and H2. H1 is derived from H2, with nearly no variation and at a low frequency. H2 is common and is the ancestral form. The leucine-rich repeat (LRR) domain has a high pi(non)/pi(syn) ratio, and the low polymorphism of the Pi-ta gene might have primarily been caused by recurrent selective sweep and constraint by other putative physiological functions. Meanwhile, we provide data to show that the amino acid Ala-918 of H1 in the LRR domain has a close relationship with the resistant phenotype. H1 might have recently arisen during rice domestication and may be associated with the scenario of a blast pathogen-host shift from Italian millet to rice.
Journal Genetics
Country Taiwan
Volume 179(3)
Pages 1527-1538
Year 2008
PubMed ID 18622033
PubMed Central ID -
DOI 10.1534/genetics.108.089805
INSD EU346955 EU346956 EU346957 EU346958 EU346959 EU346960 EU346961 EU346962 EU346963 EU346964 EU346965 EU346966 EU346967 EU346968 EU346969 EU346970 EU346971 EU346972 EU346973 EU346974 EU346975 EU346976 EU346977 EU346978 EU346979 EU346980 EU346981 EU346982 EU346983 EU346984 EU346985 EU346986 EU346987 EU346988 EU346989 EU346990 EU346991 EU346992 EU346993 EU346994 EU346995 EU346996 EU346997 EU346998 EU346999 EU347000 EU347001 EU347002 EU347003 EU347004 EU347005 EU347006
Strain Wild Core Collection -
Induced Mutation Lines(NIG Collection) -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
Stages in Each Organ
- Muant Lines (Gene)
Cultivated Varieties(NIG Collection) -
Stages in Each Organ -