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1. A New Strain of Streptomyces Causing Common Scab in Potato

Description:
Includes references
Author:
Wanner, L.A.
Subject:
Solanum tuberosum , potatoes , Streptomyces scabiei , plant pathogenic bacteria , bacterial diseases of plants , scab diseases , strains , strain differences , pathogenicity , ribosomal DNA , nucleotide sequences , genes , tubers , stems , stolons , microbial genetics , Idaho
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

2. Assessing Potential Pathogenicity of Avian Influenza Virus: Current and Experimental System

Description:
Paper presented at the Sixth International Symposium on Avian Influenza held April 3-6, 2006, Cambridge, England.
Author:
Lee, C.W. , Lee, Y.J. , Swayne, D. , Senne, D. , Linares, J. , Suarez, D.
Subject:
Influenza A virus , pathogenicity , strains , strain differences , microbial genetics , nucleotide sequences , hemagglutinins , genes , virulence , chickens , international trade , genotype , phenotype , genetic markers , fibroblasts , embryo (animal)
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

3. Global molecular surveillance reveals novel Fusarium head blight species and trichothecene toxin diversity

Description:
Includes references
Author:
Starkey, D.E. , Ward, T.J. , Aoki, T. , Gale, L.R. , Kistler, H.C. , Geiser, D.M. , Suga, H. , Tóth, B. , Varga, J. , O'Donnell, K.
Subject:
Fusarium , plant pathogenic fungi , scab diseases , trichothecenes , mycotoxins , geographical variation , genetic variation , phylogeny , molecular systematics , taxonomy , loci , nucleotide sequences , genes , pathogenicity , Triticum aestivum , wheat , microbial genetics , new species , chemotypes , nivalenol , new geographic records , fungal anatomy , United States , Australia , South Africa
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

4. Identification and Characterization of a Novel Whitefly-Transmitted Member of the Family Potyviridae Isolated from Cucurbits in Florida

Description:
Includes references
Author:
Adkins, S. , Webb, S.E. , Achor, D. , Roberts, P.D. , Baker, C.A.
Subject:
Cucurbita pepo , squashes , Potyviridae , pathogenicity , signs and symptoms (plants) , plant veins , disease transmission , Bemisia tabaci , Myzus persicae , insect pests , plant pests , disease diagnosis , viral proteins , coat proteins , genes , nucleotide sequences , Florida
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

5. Identification, Characterization, and Detection of Black raspberry necrosis virus

Description:
Includes references
Author:
Halgren, A. , Tzanetakis, I.E. , Martin, R.R.
Subject:
Rubus occidentalis , raspberries , Black raspberry necrosis virus , pathogenicity , disease detection , signs and symptoms (plants) , RNA , molecular cloning , genes , nucleotide sequences , Oregon
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

6. 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

7. Investigation of an Outbreak of Fusarium Foot and Fruit Rot of Pumpkin Within the United States

Description:
Includes references
Author:
Elmer, W.H. , Covert, S.F. , O'Donnell, K.
Subject:
Cucurbita , pumpkins , Fusarium solani f. sp. cucurbitae , foot rot (plant) , pods , disease outbreaks , disease incidence , strains , pathogen identification , strain differences , pathogenicity , polymerase chain reaction , nucleotide sequences , disease diagnosis , Connecticut , New York , Ohio , Missouri
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007

8. The Cercospora nicotianae gene encoding dual O-methyltransferase and FAD-dependent monooxygenase domains mediates cercosporin toxin biosynthesis

Description:
Includes references
Author:
Dekkers, K.L. , You, B.J. , Gowda, V.S. , Liao, H.L. , Lee, M.H. , Bau, H.J. , Ueng, P.P. , Chung, K.R.
Subject:
Cercospora nicotianae , plant pathogenic fungi , oxygenases , methyltransferases , genes , nucleotide sequences , mycotoxins , biosynthesis , gene expression , gene expression regulation , pathogenicity , lesions (plant) , leaves , Nicotiana tabacum , fungal diseases of plants
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
Year:
2007