Pathogenicity of Phytophthora species from Oregon waterways Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cc08hh971

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  • Described as one of the most destructive pathogens of agricultural crops and forest trees, Phytophthora is a genus of microorganisms containing over 100 known species. Phytophthora alni has caused collar and root disease in alders throughout Europe and a form of the species has recently been isolated in North America. Red alder, Alnus rubra, is native to Oregon and has been reported to be suffering from dieback, which prompted a survey of their overall health as well as determining if P. alni was present. Over 1200 individual Phytophthora isolates were recovered in the survey, which are representative of 22 species and 2 taxa, including P. alni subsp. uniformis. High levels of mortality for red alder were not observed during the WORE survey, which suggests these Phytophthora species are not aggressive pathogens of red alder. In order to test the hypothesis that red alder is not susceptible to the twelve Phytophthora species recovered from western Oregon riparian ecosystems, a variety of pathogenicity tests were conducted. Twelve species of Phytophthora were selected from the Phytophthora species recovered from the western Oregon riparian ecosystem survey for pathogenicity testing. Red alder seedlings were selected for testing because they have adapted to survive in riparian ecosystems, which is where these Phytophthora species have been recovered. Pathogenicity tests conducted for this study demonstrated that the twelve Phytophthora species from the survey of riparian ecosystems were able to cause minor disease symptoms on red alder, but did not cause the same symptoms observed during the WORE survey. Phytophthora species have the potential to have global impacts on forest ecosystems, which can be mitigated by conducting research on indigenous species before they become global issues of forest health.
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  • description.provenance : Submitted by Sarah Navarro (navarros@onid.orst.edu) on 2013-07-13T18:48:25Z No. of bitstreams: 1 NavarroSarahM2014.pdf: 1962597 bytes, checksum: daa3470233789fd1242ab7fc9406d537 (MD5)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting because after making the revisions the page numbers on the Table of Contents starting with page 37 - 81 are not matching with the actual thesis. The Table of Contents shows Chapter 2 starting on page 38 and it's page 37. All the other revisions look good, thanks! ~Julie on 2013-07-15T18:36:28Z (GMT)
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  • description.provenance : Submitted by Sarah Navarro (navarros@onid.orst.edu) on 2013-07-04T01:03:18Z No. of bitstreams: 1 NavarroSarahM2013.pdf: 1982234 bytes, checksum: e5e3975843086f2fee5c365210215bc2 (MD5)
  • description.provenance : Approved for entry into archive by Julie Kurtz(julie.kurtz@oregonstate.edu) on 2013-07-16T15:41:29Z (GMT) No. of bitstreams: 1 NavarroSarahM2014.pdf: 2157722 bytes, checksum: 935a2a1cf99a0732c02666c876938b40 (MD5)
  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Rejecting because 1) Table of Contents (Continued) is on the bottom of the previous page instead of on the top heading. 2) page 37 is blank, is there something missing? 3) there are two page 81's . The first is the second page of Discussion and the second is Table 6.A. Once revised, open the item that was rejected. Replace the attached file with the revised file and resubmit. Thanks, Julie on 2013-07-08T18:35:20Z (GMT)

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