rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Phenotyping of High Temperature Susceptibility in Garden Roses (Rosa x hybrida)
  name:
    name part: Greyvenstein, Ockert Frederick
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Byrne, David H. (David Hawkins)
    name part: 1953-
    role:
      role term: thesis advisor.
  name:
    name part: Starman, Terri W.
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2014
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource (136 pages)
  abstract: Roses (Rosa x hybrida) have delighted man for nearly 5000 years as ornamentals, food, and medicine. A decline in garden roses in the U.S. has been observed in the past 30 years, which can be attributed in part to the lack of widely adapted cultivars. Adaptation to high temperature stress is viewed as high priority in breeding programs of all major crops. High temperature stress negatively affects garden rose performance and the quality of flowers produced. The work described in this dissertation is focused on quantifying high temperature susceptibility in garden roses to enable breeders selecting for high temperature performance to make better selections. Seasonal change in flower size and plant architecture was investigated on 14 field grown cultivars. Controlled environment experiments were used to establish the developmental stage where flowers were most sensitive to high temperatures. The effectiveness of detached leaf assays as indicators of thermotolerance by way of cell membrane thermostablity (MTS) and chlorophyll fluorescence is reported on. Flower abscission and leaf necrosis of whole plants shocked in a heat chamber were correlated to summer flower productivity. The mean daily maximum temperature for days 8 - 14 (2WkMax ̊C) before a flower opens best described the fluctuation in flower dry weight during the growing season. Differences in the rate of change were found among cultivars. Subjecting plants at different stages of development to two week high temperature (36/28 ̊C) treatments revealed flowers were most sensitive to high temperatures at the visible bud stage of development. Two week high temperature treatments and high temperature shock (44 ̊C, 3 h) both resulted in decreased flower dry weight and increased flower abscission. Initial results favored MTS over chlorophyll fluorescence as indicator of high temperature susceptibility. Further investigation showed no correlation between MTS and summer flower intensity recorded for 18 cultivars. Propen…
  note: by Ockert Frederick Coenrad Greyvenstein.
  note: "Major Subject: Plant Breeding"
  note: Includes vita.
  note: Doctor of Philosophy Texas A & M University 2013 http://hdl.handle.net/1969.1/151819
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Plant Breeding
  subject:
    topic: Heat tolerance
  subject:
    topic: Rose breeding
  subject:
    topic: Rose genetics
  subject:
    topic: Flower size
  subject:
    topic: Flower abscission
  subject:
    topic: Leaf necrosis
  subject:
    topic: Electrolyte leakage
  subject:
    topic: Chlorophyll fluorescence
  subject:
    topic: Cell membrane thermostability
  subject:
    topic: Heat chamber
  identifier: http://hdl.handle.net/1969.1/151819
  record info:
    record content source: TXA
    record creation date: 140624
    record change date: 20151206101856.0
    record identifier: in00003478514
    language of cataloging:
      language term: eng