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: Investigations on the variability of the sorghum anthracnose fungus C̲o̲l̲l̲e̲t̲o̲t̲r̲i̲c̲h̲u̲m̲ g̲r̲a̲m̲i̲n̲i̲c̲o̲l̲a̲
  name:
    name part: Casela, Carlos Roberto
    name part: 1951-
    role:
      role term: creator
  name:
    name part: Frederiksen, Richard A.
    role:
      role term: degree supervisor.
  name:
    name part: Duncan, Ronny R.
    role:
      role term: degree committee member.
  name:
    name part: Magill, Clint W.
    role:
      role term: degree committee member.
  name:
    name part: McDonald, Bruce A.
    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: 1992
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xx, 166 leaves : illustrations ; 29 cm
  abstract: Laboratory and greenhouse experiments were conducted to: 1) investigate the diversity in the sorghum anthracnose fungus Colletotrichum graminicola using biotechnological and conventional techniques; 2) study the pathogenic variability among monoconidial isolates from isolated leaf lesions and monoconidial cultures; and 3) evaluate mutation as a mechanism contributing to pathogenic variability in this organism. For the first study, monoconidial isolates of C. graminicola were established from collections made in commercial fields and experimental trials during 2 consecutive years from 4 regions of Brazil (Central, South, Southeast, and Northeast) and from the sorghum anthracnose flora of Texas and Georgia in the United States. A total of 78 monoconidial isolates were investigated for variability in virulence on 8 differential sorghum cultivars and in RAPD (Random Amplified Polymorphic DNA) banding patterns as defined by 8 primers. Average linkage cluster analysis, applied to both types of data, revealed a lack of relationship between clusters as defined by these markers. The same or related virulence phenotypes were composed by genetically distant isolates when analyzed by RAPD markers. Isolates of C. graminicola within the same or related RAPD pattern were obtained from distant regions, indicating that populations of this pathogen are not geographically defined. Pathogenicity of monoconidial cultures from a discrete lesion and from monoconidial cultures and sub-cultures from the sorghum cultivars Tx623 and SC748-5 was evaluated on 5 differentials. Monoconidial isolates from single lesions and from monoconidial cultures and sub-cultures were separated into several different virulence phenotypes, indicating the occurrence of pathogenic instability, at least in some isolates of this pathogen. Reversion from a virulent to an avirulent state was observed for some isolates. To search for the possibility of obtaining natural mutants for virulence, 2 isolates of C. graminic…
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Plant Pathology."
  note: Ph. D. Texas A & M University 1992
  note: Includes bibliographical references.
  subject:
    topic: Sorghum
    topic: Diseases and pests
  subject:
    topic: Colletotrichum graminicola
    topic: Genetics
  subject:
    topic: Colletotrichum graminicola
    topic: Variation
  subject:
    topic: Major plant pathology
  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: 931005
    record change date: 20200904152614.0
    record identifier: in00001160506
    language of cataloging:
      language term: eng