Undergraduate Thesis Or Project

 

In search of ecological advantages : Mycorrhizal facilitation of big huckleberry Vaccinium membranaceum (Doug.) Public Deposited

Downloadable Content

Download file
https://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/hm50tt75f

Descriptions

Attribute NameValues
Creator
Abstract
  • Temperate evergreen forests of the Pacific Northwest support big huckleberries (Vaccinium membranaceum) despite their nutrient impoverished soils. Acquisition of nitrogen and phosphorous are the major nutrients limiting V. membranaceum. The plant’s access to these resources is linked to their mycorrhizal symbiosis. To learn more about the symbionts of eriaceous plants in temperate evergreen forests, this study focuses on new methods to quantify mycorrhizal facilitation, and a search for correlations between level of infection and soil qualities. Quantifying enzyme activity differentiates active hyphae from inactive or senescing hyphae, in contrast to conventional microscopy techniques. Because ericoid mycorrhizae are the primary contributors of phosphorus to V. membranaceum, phosphatase assays were used as a rapid method to quantify mycorrhizal infection. These tests suggest that phosphatase assays may not be as satisfactory as other enzyme assays to indicate mycorrhizal facilitation because they do not correlate well with physical infection values found by microscopy. This observation could be the result of: 1.) variation within seasonal activity of the ericoid symbiont, 2.) unknown phosphatase contributions from dark septate endophytes, 3.) a miscalculation of enzyme standard curves, or 4.) a combination of the three factors. The infection of roots by dark septate endophytes was correlated with both the total available phophorus and organic phosphorus. An increase in root size was positively correlated with increased organic matter and total nitrogen (also interpreted as an absence of smaller hair-roots). Implications of these results regarding variation in nutrient availability throughout a year and over time (decades) are discussed.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Non-Academic Affiliation
Rights Statement
Publisher
Peer Reviewed
Language
File Format
File Extent
  • 43350528 bytes
Replaces
Additional Information
  • description.provenance : Made available in DSpace on 2006-09-25T18:06:00Z (GMT). No. of bitstreams: 1stocking.doc: 43350528 bytes, checksum: 29c4aedadf98f16221af27ca45d06787 (MD5)
  • description.provenance : Rejected by Linda Kathman(linda.kathman@oregonstate.edu), reason: Janet, Please resubmit this without the markup language showing in the original document.Thanks,Linda on 2006-09-25T16:45:45Z (GMT)
  • description.provenance : Submitted by Janet Webster (janet.webster@oregonstate.edu) on 2006-09-20T22:50:26ZNo. of bitstreams: 1stocking.doc: 43349504 bytes, checksum: 7013def6ba2b77357685d2f7214d07af (MD5)
  • description.provenance : Approved for entry into archive by Linda Kathman(linda.kathman@oregonstate.edu) on 2006-09-25T18:05:59Z (GMT) No. of bitstreams: 1stocking.doc: 43350528 bytes, checksum: 29c4aedadf98f16221af27ca45d06787 (MD5)
  • description.provenance : Submitted by Janet Webster (janet.webster@oregonstate.edu) on 2006-09-25T17:51:15ZNo. of bitstreams: 1stocking.doc: 43350528 bytes, checksum: 29c4aedadf98f16221af27ca45d06787 (MD5)

Relationships

Parents:
In Collection:

Items