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: Studies on Septoria tritici blotch of wheat in Texas
  name:
    name part: Garcia, Celsa
    name part: 1957-
    role:
      role term: creator
  name:
    name part: Magill, Clint W.
    role:
      role term: degree supervisor.
  name:
    name part: Marshall, David
    role:
      role term: degree supervisor.
  name:
    name part: McDaniel, Milton E.
    role:
      role term: degree committee member.
  name:
    name part: Starr, James L.
    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: 1993
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiii, 84 leaves : illustrations, map ; 28 cm
  abstract: Septoria tritici blight (STB) epidemics caused by the fungus Septoria tritici Rob. ex Desm. have become prominent in recent years over the coastal, eastern and north central regions of Texas where the weather is generally favorable for the development of the disease. The purpose of this work was to explore several facets of STB epidemiology and biology in Texas. Efforts to determine the presence of the sexual stage of the pathogen were successful. Pseudothecia and asci containing ascospores, that conformed to the description of Mycosphaerella graminicola, were found from September 1989 until March 1990 on leaves and sheaths of naturally infected wheat plants. Plants inoculated with ascospores developed symptoms characteristic of STB and produced typical S. tritici pycnidia. The infection process of ascospores were longer, and required a higher level of humidity than infection by conidia. Electrophoresis of total DNA showed four low molecular weight bands in S. nodorum isolates which were missing in all S. tritici isolates. The bands consisted of ssRNA as indicated by acridine orange staining. Restriction patterns of the S. nodorum isolates were unmistakably distinct from those of S. tritici. At least one dimorphism was detected among S. tritici isolates. Pathogenic variation was detected among S. tritici isolates as expressed on the disease progress curves on each of 22 wheat cultivars. An aggressiveness pattern was detected for each isolate, but exceptions indicated an isolate-cultivar interaction. Disease levels of natural infections on several locations and years could not be predicted, and varied depending an a specific year-location combination. Disease levels evaluated at one time were correlated with disease progress curves generated by 4-5 evaluation times.
  note: Vita.
  note: "Major subject: Plant Pathology."
  note: Includes bibliographical references.
  note: Ph. D. Texas A & M University 1993
  subject:
    geographic code: n-us-tx
  subject:
    topic: Wheat
    topic: Diseases and pests
    geographic: Texas
  subject:
    topic: Wheat speckled leaf blotch
    geographic: Texas
  subject:
    topic: Septoria tritici
    geographic: Texas
    topic: Genetics
  subject:
    topic: Major plant pathology
  subject:
    topic: Wheat
    topic: Diseases and pests
  subject:
    topic: Wheat speckled leaf blotch
  subject:
    geographic: Texas
  identifier: http://gateway.proquest.com/openurl
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://gateway.proquest.com/openurl
  record info:
    record content source: TXA
    record creation date: 950809
    record change date: 20200904152705.0
    record identifier: in00001231261
    language of cataloging:
      language term: eng