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1. Evolution of an avirulence gene, AVR1-CO39, concomitant with the evolution and differentiation of Magnaporthe oryzae

Description:
Includes references
Author:
Tosa, Y. , Osue, J. , Eto, Y. , Oh, H.S. , Nakayashiki, H. , Mayama, S. , Leong, S.A.
Subject:
Magnaporthe grisea , plant pathogenic fungi , fungal proteins , complementary DNA , sequence analysis , loci , pathogenicity , host-pathogen relationships , blast disease , Oryza sativa , rice , host plants , Triticum aestivum , wheat , Setaria italica , millets , evolution , nucleotide sequences
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2005

2. Instability of the Magnaporthe oryzae avirulence gene AVR-Pita alters virulence

Description:
The avirulence gene AVR-Pita of Magnaporthe oryzae determines the efficacy of the resistance gene Pi-ta in rice. The structures of the AVR-Pita alleles in 39 US isolates of M. oryzae were analyzed using polymerase chain reaction. A series of allele-specific primers were developed from the AVR-Pita gene to examine the presence of AVR-Pita. Orthologous alleles of the AVR-Pita gene were amplified from avirulent isolates. Sequence analysis of five alleles revealed three introns at identical positions in the AVR-Pita gene. All five alleles were predicted to encode metalloprotease proteins highly similar to the AVR-Pita protein. In contrast, the same regions of the AVR-Pita alleles were not amplified in the most virulent isolates, and significant variations of DNA sequence at the AVR-Pita allele were verified by Southern blot analysis. A Pot3 transposon was identified in the DNA region encoding the putative protease motif of the AVR-Pita protein from a field isolate B2 collected from a Pi-ta-containing cultivar Banks. These findings show that transposons can contribute to instability of AVR-Pita and is one molecular mechanism for defeating resistance genes in rice cultivar Banks.
Author:
Zhou, E.X. , Jia, Y.L. , Singh, P. , Correll, J.C. , Lee, F.N.
Subject:
Magnaporthe , plant pathogenic fungi , genes , virulence , alleles , introns , DNA primers , polymerase chain reaction , nucleotide sequences , transposons , pathogenicity , blast disease , Oryza sativa , rice
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

3. Sequence variation at the rice blast resistance gene Pi-km locus: Implications for the development of allele specific markers

Description:
Includes references
Author:
Costanzo, Stefano , Jia, Yulin
Subject:
Oryza sativa , rice , grain crops , Magnaporthe , plant pathogenic fungi , blast disease , disease resistance , genetic resistance , gene-for-gene relationship , disease control , plant breeding , genetic markers , nucleotide sequences , genetic variation , alleles , loci , cultivars , genetic polymorphism , amino acid sequences , protein subunits , protein conformation , introgression
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2010

4. Silencing of subfamily I of protein phosphatase 2A catalytic subunits results in activation of plant defense responses and localized cell death

Description:
Includes references
Author:
He, X. , Anderson, J.C. , Del Pozo, O. , Gu, Y.Q. , Tang, X. , Martin, G.B.
Subject:
Arabidopsis thaliana , Nicotiana tabacum , Nicotiana benthamiana , tobacco , Oryza sativa , rice , phosphoprotein phosphatase , gene silencing , multigene family , messenger RNA , plant response , bacterial diseases of plants , fungal diseases of plants , disease resistance , resistance mechanisms , phenotypic variation , plant morphology , hypersensitive response , apoptosis , pathogenesis-related proteins , host-pathogen relationships , Pseudomonas syringae pv. tomato , Pseudomonas syringae pv. tabaci , plant pathogenic bacteria , Fulvia fulva , plant pathogenic fungi , amino acid sequences , nucleotide sequences
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2004

5. Sm1, a Proteinaceous Elicitor Secreted by the Biocontrol Fungus Trichoderma virens Induces Plant Defense Responses and Systemic Resistance

Description:
Includes references
Author:
Djonović, S. , Pozo, M.J. , Dangott, L.J. , Howell, C.R. , Kenerley, C.M.
Subject:
Oryza sativa , rice , Gossypium hirsutum , cotton , Trichoderma , biological control agents , fungal proteins , nucleotide sequences , amino acid sequences , systemic acquired resistance , resistance mechanisms , soil fungi , phytotoxicity , reactive oxygen species , pathogenesis-related proteins , gene expression , nutrient availability , host plants , cotyledons , Colletotrichum , plant pathogenic fungi , fungal diseases of plants , Hypocrea virens
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2006