Distribution and characterization of ice nucleation active strains of Pseudomonas syringae from diseased woody plants and grasses Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mp48sh29j

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • In a recent survey, it was observed that many woody plant species grown in Pacific Northwest nurseries exhibited disease symptoms typical of a bacterial infection and Pseudomonas syringae was commonly isolated from these tissues. The distribution of the ice nucleation phenotype among P. syringae strains recovered from these infected woody hosts was examined. More than eighty-five percent of the P. syringae strains from linden, lilac, dogwood and oriental magnolia samples were ice nucleation active (INA) at 5°C; 76% of the P. syringae strains from aspen were INA at -5°C; but only 30% of the P. syringae strains from Japanese pear and 24% of the red maple strains were active ice nucleators at this temperature. The P. syringae strains isolated from these seven plant hosts were variable relative to their ability to induce a hypersensitive response in tobacco leaves and their ability to induce pathogenic changes when injected into immature tomato fruits. The range in hypersensitivity response by P. syringae strains isolated from a particular host varied from 100% in aspen strains to 57% in Japanese pear while the range in potential pathogenic ability on tomato fruit varied from 100% in aspen to 36% in saucer magnolia. In November 1983, tissue samples were also obtained from fields of diseased sudan grass used as green manure, from fields of symptomless cereal rye grass grown as cover crops as well as from roadside grass species growing around the perimeter of nursery production areas. Large populations of pathogenic and INA strains of P. syringae were isolated from these grass strains with populations of fluorescent pseudomonads exceeding 10⁹ cfu/g fresh tissue from sudan samples whereas populations of 10⁹ cfu/g were obtained from cereal rye grass and roadside grass samples. Eighty-one randomly selected strains from these isolations were tested using the L0PAT determination scheme for fluorescent pseudomonad identification. Fifty-eight of the 81 strains (72%) were similar to P. syringae, whereas 34 (59%) of the 58 strains were ice nucleation active at -5°C. Thirty-one of the 58 strains induced a hypersensitive response in tobacco leaves, and 29 (50%) were pathogenic to green fruit of tomato. Several P. syringae strains isolated from sudan and cereal rye grass were pathogenic when inoculated to greenhouse grown sudan seedlings; however, none of the strains tested were pathogenic to cereal rye grass seedlings in the greenhouse. Three of six P. syringae strains tested were also pathogenic to young shoots and leaves of peach trees maintained in a greenhouse chamber at high humidity.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-17T18:36:00Z (GMT) No. of bitstreams: 1 BacaSteve1986.pdf: 251228 bytes, checksum: 22bf0f249bec1e472cc426581e6508f8 (MD5)
  • description.provenance : Made available in DSpace on 2013-07-17T18:36:00Z (GMT). No. of bitstreams: 1 BacaSteve1986.pdf: 251228 bytes, checksum: 22bf0f249bec1e472cc426581e6508f8 (MD5) Previous issue date: 1986-04-11
  • description.provenance : Submitted by Katy Davis (kdscannerosu@gmail.com) on 2013-07-01T21:51:21Z No. of bitstreams: 1 BacaSteve1986.pdf: 251228 bytes, checksum: 22bf0f249bec1e472cc426581e6508f8 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-07-02T14:40:58Z (GMT) No. of bitstreams: 1 BacaSteve1986.pdf: 251228 bytes, checksum: 22bf0f249bec1e472cc426581e6508f8 (MD5)

Relationships

In Administrative Set:
Last modified: 08/16/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items