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: Advancements in Sorghum Breeding to Address Emerging Challenges
  name:
    name part: Kyanam, Ammani
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Rooney, William
    role:
      role term: thesis advisor.
  name:
    name part: Texas A&M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2023
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Developing novel tools to aid in sorghum improvement in an ongoing initiative, and this study aims to addresses two such distinct research objectives. The first objective was to evaluate the effects of the temporal male gametocide trifluoromethanesulfonamide (TFMSA) on treated sorghum inbred lines and their derived hybrids in order to gauge its application within a breeding program. Foliar applications of 25 mg per plant of TFMSA were made to a set of male-fertile B and R lines, and treated plants were compared to the corresponding untreated male-sterile A/ms3-line. Among treated inbreds, there was a delay in flowering, reduction in plant height and an average 15% reduction in hybrid seed production but TFMSA induced near-complete male-sterility and allowed for testcross hybrid seed production across a variety of genotypes. Testcross hybrid comparison did not show any significant difference between TFMSA induced male-sterile lines and the conventional sterility systems such as cytoplasmic- or genetic male-sterility. Results demonstrates that TFMSA can be used to produce breeding crosses, population development or testcross hybrid seed production all of which can aid in breeding objectives. The second objective was to identify quantitative trait loci (QTL) associated with resistance to sorghum aphid (Melanaphis sorghi) in two biparental recombinant inbred (RIL) populations derived from novel resistance source BTx3408. These RILs were genotyped using DArTseqLD and genetic linkage maps of markers were constructed individually for each population in addition to a consensus map. The RILs were phenotyped using a visual scoring scale of 1-9 in representative sorghum growing regions of Texas in experimental sites with ample natural pest populations. Results show that broad sense heritability estimates for the trait ranged between 0.60 to 0.76 and QTL mapping revealed a single major effect QTL on the short arm of chromosome 06 that explained between 22 to 36% of the total va…
  note: by Ammani Kyanam.
  note: "Major Subject: Plant Breeding"
  note: Includes vita.
  note: Doctor of Philosophy Texas A&M University 2022 https://hdl.handle.net/1969.1/198017
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Plant Breeding
  subject:
    topic: Gametocide
  subject:
    topic: TFMSA
  subject:
    topic: CHA
  subject:
    topic: male sterility
  subject:
    topic: sorghum aphid
  subject:
    topic: sugarcane aphid
  subject:
    topic: QTL mapping
  identifier: https://hdl.handle.net/1969.1/198017
  record info:
    record content source: TXA
    record creation date: 240827
    record change date: 20240829173516.4
    record identifier: in00005468635
    language of cataloging:
      language term: eng