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: Evaluation of reciprocal recurrent selection composites for combining ability and phenotypic variability
  name:
    name part: Bockholt, Anton John.
    role:
      role term: creator
  name:
    name part: Collier, J. W.
    role:
      role term: degree supervisor.
  name:
    name part: Hanna, R. L.
    role:
      role term: degree committee member.
  name:
    name part: Kilpatrick. R. A.
    role:
      role term: degree committee member.
  name:
    name part: McAfee, T. E.
    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: theses
  genre: Academic theses
  origin info:
    place:
      place term: txu
    date issued: 1967
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: 72 leaves tables
  abstract: During 1963 and 1964 composites from a reciprocal recurrent selection breeding program were evaluated to determine the effectiveness of the program in improving combining ability and maintaining phenotypic variability within the populations. The combining ability tests were grown at College Station and Temple, Texas. Composites were available from five cycles of testing of the reciprocal recurrent selection study being conducted by the Texas Agricultural Experiment Station. The open-pollinated varieties Yellow Surcropper (YS) and Ferguson's Yellow Dent (FYD) are the parental varieties in the study. Crosses were made in all possible combinations with the YS composites and the FYD composites, i.e. YS-0 x FYD-0, FYD-1, FYD-2, etc. Crosses also were made with the composites, YS-0 to YS-4 and FYD-0 to FYD-4 and seven testers. The results of this study indicated that general combining ability was relatively more important than specific combining ability in determining the characters studied. However, since composites rather than homozygous lines were used in this study, there was probably a better estimate of general combining ability than of specific combining ability. The yields of the composite crosses and composite x tester crosses indicated that the greatest improvement has been made for general combining ability in the FYD population. Little if any improvement has been made in the YS population. In the variability study, the composites were space-planted in blocks at College Station and Temple. Measurements were made of 200 plants of each composite at each location. Variances were computed for each composite and the variances within each group for each location were tested for homogeneity using Bartlett's test for homogeneity of variances. Variation, as measured by the variance of the composites, has been maintained at a high level for all agronomic characters studied. In the YS group a decrease in variation occurred for ear length and ear weight, while in the FYD g…
  note: Ph. D. in Plant Breeding Texas A & M University
  subject:
    topic: Major plant breeding
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-169668
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-169668
  record info:
    record content source: TXA
    record creation date: 791112
    record change date: 20220103135214.0
    record identifier: in00000162388
    language of cataloging:
      language term: eng