Journal article
Population Biology of Pseudoperonospora humuli in Oregon and Washington
Plant disease, Vol.90(10), pp.1283-1286
10/2006
Handle:
https://hdl.handle.net/2376/108093
PMID: 30780933
Abstract
Pseudoperonospora humuli populations from Oregon and Washington were analyzed for genetic variation using random amplified polymorphic DNA (RAPD) and DNA amplification fingerprinting (DAF) markers. The genetic structure of the Oregon and Washington populations differed considerably. There was little genetic diversity in Washington, with only five RAPD and six DAF groups detected among 40 isolates tested. One genotype was predominant in Washing-ton. In contrast, 18 RAPD and 34 DAF groups were found among the 40 isolates tested from Oregon. No unique band profile associated with host cultivar was observed. It is suggested that the distinct difference in population structure between the two geographic regions might be due to climatic differences resulting in a higher frequency of sexual reproduction of P. humuli in Oregon than in Washington.
Populations of the hop downy mildew pathogen (Pseudoperonospora humuli) from Oregon and Washington were analyzed for genetic variation using random amplified polymorphic DNA (RAPD) and DNA amplification fingerprinting (DAF) markers. The genetic structure of the pathogen populations in Oregon and Washington differed considerably. There was little genetic diversity in Washington, with only five RAPD and six DAF groups detected among 40 isolates tested. Among the Washington isolates, 90% were in a single RAPD group and 85% were in a single DAF group. In contrast, 18 RAPD and 34 DAF groups were found among the 40 isolates tested from Oregon. The distinct differences in population diversity between the two geographic regions suggest that sexual reproduction of the pathogen might be more important in Oregon than Washington. The relative cool and wet growing season in the Willamette Valley of Oregon is conducive to disease development and possibly sexual reproduction, while the relatively warm and dry climate of central Washington is less favorable to hop downy mildew, perhaps inhibiting formation of oospores (sexual spores).
Metrics
4 Record Views
Details
- Title
- Population Biology of Pseudoperonospora humuli in Oregon and Washington
- Creators
- Hee Youn Chee - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350Mark E Nelson - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350Gary G Grove - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350Kenneth C Eastwell - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350Stephen T Kenny - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350Robert E Klein - Irrigated Agriculture Research and Extension Center, Washington State University, 24106 N. Bunn Rd., Prosser 99350
- Publication Details
- Plant disease, Vol.90(10), pp.1283-1286
- Academic Unit
- Plant Pathology, Department of
- Identifiers
- 99900546970801842
- Language
- English
- Resource Type
- Journal article