Graduate Thesis Or Dissertation
 

Nursery, cold storage, and field studies on western conifers inoculated with spores of Pisolithus tinctorius

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3n2041952

Descriptions

Attribute NameValues
Creator
Abstract
  • Inoculations of white fir, Shasta red fir, Douglas fir and ponderosa pine with Pisolithus tinctorius spores when outplanted failed to produce P. tinctorius mycorrhizae at the end of the first growing season. In the third year a few P. tinctorius mycorrhizae were formed on white fir. Inoculations reduced seedling survival in some cases. High rate of spore application may have desiccated roots of the true firs; levels of spore application need careful attention. Soil scarification and ripping significantly promoted growth of white fir seedlings compared to scarification alone. White fir, Shasta red fir, Douglas fir and ponderosa pine seedlings were inoculated in a bareroot nursery with spores of P. tinctorius. The spores were applied at three rates with vs. without cold-wet pretreatment of 7 vs. 21 days. Pretreatment did not affect their efficiency as inoculum. Inoculated ponderosa pine seedlings grew significantly more than noninoculated. Growth of inoculated Douglas fir, Shasta red, and white fir seedlings did not differ significantly from that of noninccuiated. Inoculations in the greenhouse with a wider range of spore application rates revealed that a higher concentration of spores was needed to induce an increase in growth and mycorrhiza formation for Douglas fir than for ponderosa pine. The effective application rates were much higher than those used in nursery inoculations. Survival and growth of white fir, Douglas fir and ponderosa pine seedlings and survival of mycorrhizal fungi on their roots were assessed after cold storage with or without 5 ppm ethylene in combination with four root treatments: (1) washed, (2) dipped in Truban solution, (3) dipped in Benlata solution, and (4) no treatment. Ethylene treatment resulted in increased survival, apical bud burst, and new root production when roots were untreated. Root washing and fungicide treatments, however decreased vigor of seedlings, especially that of white fir. ?. tinctorius, which formed mycorrhizae with 10-20 percent of the short roots of the seedlings, did not survive cold storage. Thelephora sp. and an ectendomycorrhizal fungus both survived cold storage and rapidly colonized roots newly formed on seedlings planted after cold storage.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
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

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details AlvarezIsabelF1983.pdf 2017-08-07 Public Download