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:
    non sort: The
    title: identification of two maturity loci sheds light on photoperiodic flowering in sorghum
  name:
    name part: Murphy, Rebecca.
    role:
      role term: creator
  name:
    name part: Mullet, John
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2012
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Harnessing the control of flowering time in sorghum bicolor has been essential to programs committed to the development and improvement of this crop. The success of such programs was dependent on the utilization of six Maturity Loci, photoperiod- responsive floral repressors discovered through classic heritability studies. However, the identities of the genes underlying these loci have remained largely unknown. The elucidation of these genes allows for accelerated marker-assisted breeding programs and contributes to the understanding of flowering time in short day plants. Thus, in these studies, two Maturity Loci were identified using a map-based cloning approach, and alleles of each were sequenced in the germplasm. Expression analysis of individual genes by qRT-PCR and the transcriptome by RNAseq was utilized to characterize their response to photoperiod. Maturity Locus 1 (Ma1), the most effective of the loci, was identified as PSEUDORESPONSE REGULATOR 37, a component of the circadian clock. Sequence analysis revealed an allelic series at this locus, each conferring photoperiod insensitivity to varying degrees. It was demonstrated that the expression of this gene is regulated by the circadian clock, yet also highly dependent on light. Moreover, PRR37 was found to up-regulate floral repressors while down-regulating activators, providing a mechanism of flowering control consistent with the external coincidence model. Maturity Locus 6 (Ma6) also generated interest through its genetic interaction with Ma1, and was identified as Grain Yield, Plant Height and Heading Date 7 (Ghd7). Sequence analysis of Ghd7 revealed several severe mutations and these were traced through several Milo maturity standards, sweet and bioenergy varieties, as well as the pedigree of lines used heavily in the conversion of tropical sorghum to early flowering types. The expression of Ghd7 mirrors that observed for PRR37 and is also regulated by both light and the circadian clock. PRR37 and Ghd7 t…
  note: by Rebecca Murphy.
  note: "Major Subject: Biochemistry"
  note: Electronic resource.
  note: Doctor of Philosophy Texas A&M University 2012 http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11547
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Biochemistry
  subject:
    topic: flowering
  subject:
    topic: ghd7
  subject:
    topic: sorghum
  subject:
    topic: psuedoresponse regulator 37
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11547
  record info:
    record content source: TXA
    record creation date: 121126
    record change date: 20150922145733.0
    record identifier: in00002785514