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- W324803721 abstract "approved: Seed piece to plant transmission of the potato late blight pathogen, Phytophthora infestans, occurred with isolates of the clonal lineages US-8 in Oregon and US-li in Washington in field trials. Average transmission rate across potato cultivars was 0.5 and 2.4% with US-8, and 0.8 and 1.0% with US-il in 1999 and 2000, respectively. Transmission rate with US-8 was 2.3% for Russet Burbank (RB) in 1999 and 1.7, 0.7, 4.3, 7.6 and 0.5% for Baimock, Bzura, Ranger, Russet Norkotah (RN), and Umatilla, respectively, in 2000. Transmission rate with US-i 1 in 1999 was 0.5, 4.9 and 1.4% for RB, RN, and Shepody, respectively, and 1.7% for RB in 2000. Seedborne inoculum of both clonal lineages significantly affected stand establishment and plant vigor. With US-8, final emergence, emergence rate, and aerial biomass of cvs Kennebec, RB, RN, and Shepody were significantly lower than Bzura in 1999, whereas in 2000, these same responses in Chieftain, Bannock, Ranger, and Shepody were significantly lower than Bzura, Umatilla and RN. With US-il, these same response variables were significantly lower in Kennebec, RN and Shepody compared to Bzura and RB in 1999, and were Redacted for Privacy significantly lower in Bannock, Chieftain, Ranger and Shepody compared to RB and Umatilla in 2000. Plant growth responses of cvs RB and RN grown from seed pieces infected with US-8 or US-il were evaluated in greenhouse trials. RN was equally susceptible to both cional lineages whereas RB was more resistant than RN to seedborne inoculum of US-il. Compared to RN its final emergence was higher, emergence rate was faster, aerial biomass was greater, and seed piece decay was lower. US-8 was more aggressive than US-i 1 on RB. US-8 caused a greater reduction in final emergence, emergence rate, and aerial biomass, and a greater increase in seed piece decay. The two clonal lineages were similar in their aggressiveness on RN. This is the first report of cultivar*clonal lineage*inoculum density interactions for plant growth responses of potato grown from seed pieces infected with P. infestans. © HEATHER M. PARTIPILO March 11,2002 All rights reserved. Seedborne Phytophthora infestans: Effect of Pathogen Clonal Lineage and Potato Cultivar on Seed Transmission of Late Blight and Plant Growth Responses by Heather M. Partipilo A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Presented March 11, 2002 Commencement June, 2002 Master of Science thesis of Heather M. Partipilo presented on March 11, 2002. Major cfrofesr, representing Botany and Plant Pathology Chair of Department of B Dean of Gthdtiâte School and Plant Patholo I understand that my thesis will become part of the permanent collection of Oregon State University libraries. My signature below authorizes release of my thesis to any reader upon request. Author Redacted for Privacy Redacted for Privacy Redacted for Privacy Redacted for Privacy" @default.
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- W324803721 date "2002-03-11" @default.
- W324803721 modified "2023-09-27" @default.
- W324803721 title "Seedborne Phytophthora infestans : effect of pathogen clonal lineage and potato cultivar on seed transmission of late blight and plant growth responses" @default.
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