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: Pathogenic variability and sexuality in Peronosclerospora sorghi (Weston and Uppal) Shaw, and comparative nuclear cytology of Peronosclerospora species
  name:
    name part: Pawar, Malojirao Namdeo.
    role:
      role term: creator
  name:
    name part: Craig, Jeweus
    role:
      role term: degree committee member.
  name:
    name part: Frederiksen, Richard A.
    role:
      role term: degree supervisor.
  name:
    name part: Hart, Gary E.
    role:
      role term: degree committee member.
  name:
    name part: Lyda, Stuart D.
    role:
      role term: degree committee member.
  name:
    name part: Magill, Clint
    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: 1986
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: ix, 107 leaves : illustrations (some color) ; 29 cm
  abstract: Sixteen Peronosclerospora sorghi populations from seven countries were evaluated for variability in their virulence pattern on sorghum. All populations were identified as distinct vertical pathotypes based on differential sporulation on defined sorghum differentials. Cultivar-by-isolate interactions were consistent with Flor's gene-for-gene hypothesis. Sorghum cultivars IS1032, IS2473, IS3546, IS14332, IS14387, IS22227, IS22228, IS22229, IS22230, and QL-3, India were resistant to all isolates of P. sorghi tested. These cultivars are considered to be stable and durable sources of sorghum downy mildew (SDM) resistance. Most of the SDM-resistant converted cultivars from Texas remained resistant to isolates from the Americas, whereas they were susceptible to the isolates from India and Africa. P. sorghi isolates from India and Africa had a wider range of virulence compared to the isolates from the Americas. The correlation coefficient between degree of conidial sporulation on inoculated sorghum cultivars and percent SDM incidence was 0.9348. To determine the diversity in sources of resistance, sorghum cultivars that possess resistance to Texas pathotypes 1 and 3 were inoculated with conidia at seed germination. On the basis of percent SDM incidence, cultivars were grouped into resistant, heterogeneous, and susceptible classes. Sexuality in P. sorghi was evaluated by attempting to isolate mating types and by establishing the relationship between origins of gametangia. Attempts to isolate mating types failed. Light microscopy and scanning electron microscopy revealed that male and female gametangia are borne on the same vegetative hypha, i.e., that P. sorghi is homothallic. One isolate of P. sorghi (Thailand) was compared with five isolates of P. sorghi for mean number of nuclei per conidium. The mean number of nuclei (10.07) of purported P. sorghi (Thailand) differed significantly from mean number of nuclei (14.26) of the species P. sorghi. The mean of purported P. sorgh…
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. in Plant Pathology Texas A & M University 1986
  note: Includes bibliographical references (leaves 92-106).
  subject:
    topic: Downy mildew diseases
  subject:
    topic: Plants
    topic: Disease and pest resistance
  subject:
    topic: Sorghum
    topic: Diseases and pests
  subject:
    topic: Major plant pathology
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-22847
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-22847
  record info:
    record content source: TXA
    record creation date: 880526
    record change date: 20220104090809.0
    record identifier: in00000016463
    language of cataloging:
      language term: eng