Relationships between endogenous phenolic compounds of rhododendron tissues and organs and cold hardiness development Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5x21th998

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • The leaching of water soluble phenolic compounds from cold stressed Rhododendron leaves was found to be a reliable indicator of tissue damage. In sublethally stressed leaf tissues, more and novel phenolic compounds appeared and were hypothesized to be precursors of cell wall components such as lignin and suberin. Subsequent radiolabeling of sublethally cold stressed tissues showed a preferential incorporation of the phenolic precursor phenylalanine into cell walls. The appearance of more and new phenolic compounds in intact leaves was found in four varieties of artificially cold acclimated Rhododendron. Phenolic polymers including suberin and lignin were also found in cold hardened Azalea (Rhododendron sp.) floral buds. Hardy Azalea floral buds appear to possess an ice nucleation barrier within bud tissues, which seems to prevent ice present in the stem and scales from nucleating water in the primordia. Non-hardy buds do not have such barriers. This physical barrier can be removed by a sublethal heat treatment of the buds; treated buds showed decreased hardiness as measured by differential thermal analysis (DTA), evidenced by a decrease in the number of low temperature exotherms (LTE's). Histochemical and photomicrographical studies suggest a lignified, suberized barrier occurs at the base of bud scales and pedicels, and beneath the bud axis.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 24-bit Color) using Scamax Scan+ V.1.0.32.10766 on a Scanmax 412CD by InoTec in PDF format. LuraDocument PDF Compressor V.5.8.71.50 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 2011-11-18T22:30:53Z (GMT) No. of bitstreams: 1 CHALKERSCOTTLINDA1989.pdf: 2828817 bytes, checksum: 9d17db57a98987356b13889e04322686 (MD5)
  • description.provenance : Submitted by Erin Clark (ecscannerosu@gmail.com) on 2011-11-16T17:10:17Z No. of bitstreams: 1 CHALKERSCOTTLINDA1989.pdf: 2828817 bytes, checksum: 9d17db57a98987356b13889e04322686 (MD5)
  • description.provenance : Made available in DSpace on 2011-11-18T22:30:53Z (GMT). No. of bitstreams: 1 CHALKERSCOTTLINDA1989.pdf: 2828817 bytes, checksum: 9d17db57a98987356b13889e04322686 (MD5) Previous issue date: 1988-07-06
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2011-11-16T21:46:08Z (GMT) No. of bitstreams: 1 CHALKERSCOTTLINDA1989.pdf: 2828817 bytes, checksum: 9d17db57a98987356b13889e04322686 (MD5)

Relationships

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

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items