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mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Physiological, morphological, and biochemical criteria for the selection of potato germplasm that maintains yield under high temperatures
  name:
    name part: Bohac, Janice Aline
    name part: 1953-
    role:
      role term: creator
  name:
    name part: Miller, J. Creighton
    role:
      role term: degree supervisor.
  name:
    name part: Bender, David A.
    role:
      role term: degree committee member.
  name:
    name part: Park, William D.
    role:
      role term: degree committee member.
  name:
    name part: Smith, James D.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1990
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xi, 117 leaves : illustrations ; 29 cm
  abstract: The potato suffers from yield reduction and loss of quality when grown at high temperatures. Determination of the relative contribution of total biomass and partitioning to yield stability, and documentation of morphological changes that occur in heat susceptible cultivars would be useful in selection of improved heat tolerant germplasm. Potato cultivars known to differ in yield under heat stress were studied in early and late season trials in two environmentally diverse Texas locations. Based on the cumulative degree days over a high temperature threshold, the environment was described as cool, warm, or hot. In the Lubbock warm environment, tuber yield was reduced, but biomass and its components were not, implying a higher temperature threshold for haulum compared to tuber growth. Total biomass was reduced in the two warmest environments, College Station warm and hot, but partitioning appeared to be the key element in yield stability. As night temperatures increased, plant morphology changed: relative area of new leaves decreased, leaf angles became more acute, the ratios of leaf to stem and tuber to root decreased, and root to biomass increased. The effect of warmer environments on both tuber yield and the major tuber protein, patatin, was studied. First, an improved method of purification of this protein was developed. Patatin antibody was used to quantify the relative amounts of patatin in tubers, roots, leaves and stems from three potato cultivars grown in three field environments that varied from relatively cool to hot. Generally, patatin levels increased in tubers as the environment became hotter. Material that cross-reacted with patatin antibody was found in leaf, stem and root tissue. However quantification of patatin in these tissues is uncertain since not all the isoforms in leaves, stems and roots have immunological identity with those in tubers. The appearance of patatin in leaf and stem tissue seemed to coincide with reduced tuberization and a warmer e…
  note: by Janice Aline Bohac.
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Plant breeding."
  note: Ph. D. Texas A & M University 1990
  note: Includes bibliographical references.
  subject:
    topic: Potatoes
    topic: Genetics
  subject:
    topic: Potatoes
    topic: Germplasm resources
  subject:
    topic: Potatoes
    topic: Effect of heat on
  subject:
    topic: Potatoes
    topic: Genetics
  subject:
    topic: Potatoes
    topic: Germplasm resources
  subject:
    topic: Plant Breeding
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 910312
    record change date: 20200904152502.0
    record identifier: in00000989282
    language of cataloging:
      language term: eng