{"id":{"repo_id":"york","oai_identifier":"oai:yorkspace.library.yorku.ca:10315/36742"},"canonical_url":"https://search.dev.ndltd.org/etd/york/oai:yorkspace.library.yorku.ca:10315/36742","repository":{"repo_id":"york","name":"York University","base_url":"https://yorkspace.library.yorku.ca/oai/request"},"display":{"title":"Determining the Genes for Distyly in Turnera","abstract":"Heterostyly promotes outbreeding and reduces pollen wastage. Distylous species have two mating types: L-morph and S-morph plants, which are genetically determined by the S-locus. It was hypothesized that the S-locus carries at least three tightly linked genes constituting a supergene. The S-locus genes responsible for distyly in Turnera had not been determined. Using deletion mapping and chromosome walking, the S- and s-haplotypes of the S-locus were constructed. Three hemizygous genes, TsSPH1, TsYUC6, and TsBAHD occur only on the S-haplotype and appear to determine S-morph characteristics. TsSPH1 is expressed in filaments, TsYUC6 in anthers, and TsBAHD in styles. A long-homostyle mutant (Drh) did not possess TsBAHD while another long-homostyle mutant (Mhomo-H) possessed a substitution mutation in TsBAHD. Short-homostyle mutants did not express TsSPH1. The incompatibility system of Turnera joelii possessed a mutation that appears to be linked to S-locus. A possible mechanism of incompatibility is discussed which involves brassinosteroids and auxins.","abstract_html":"Heterostyly promotes outbreeding and reduces pollen wastage. Distylous species have two mating types: L-morph and S-morph plants, which are genetically determined by the S-locus. It was hypothesized that the S-locus carries at least three tightly linked genes constituting a supergene. The S-locus genes responsible for distyly in Turnera had not been determined. Using deletion mapping and chromosome walking, the S- and s-haplotypes of the S-locus were constructed. Three hemizygous genes, TsSPH1, TsYUC6, and TsBAHD occur only on the S-haplotype and appear to determine S-morph characteristics. TsSPH1 is expressed in filaments, TsYUC6 in anthers, and TsBAHD in styles. A long-homostyle mutant (Drh) did not possess TsBAHD while another long-homostyle mutant (Mhomo-H) possessed a substitution mutation in TsBAHD. Short-homostyle mutants did not express TsSPH1. The incompatibility system of Turnera joelii possessed a mutation that appears to be linked to S-locus. A possible mechanism of incompatibility is discussed which involves brassinosteroids and auxins.","abstract_has_math":false,"creators":["Hamam, Hasan Jihad"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Shore, Joel S"],"committee_chairs":[],"committee_members":[],"year":2019,"date_issued":"2019-11-22","date_published":"2019-11-22","updated_at":"2026-07-24T06:33:34Z","subjects":["Molecular biology"],"languages":["en"],"rights":["Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10315/36742","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Shore, Joel S"]},{"key":"dc:creator","label":"Author","values":["Hamam, Hasan Jihad"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2019-11-22T18:49:57Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2019-11-22T18:49:57Z"]},{"key":"dc:date.issued","label":"Date","values":["2019-11-22"]},{"key":"dc:type","label":"Dc Type","values":["Electronic Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Molecular biology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/10315/36742"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Heterostyly promotes outbreeding and reduces pollen wastage. Distylous species have two mating types: L-morph and S-morph plants, which are genetically determined by the S-locus. It was hypothesized that the S-locus carries at least three tightly linked genes constituting a supergene. The S-locus genes responsible for distyly in Turnera had not been determined. Using deletion mapping and chromosome walking, the S- and s-haplotypes of the S-locus were constructed. Three hemizygous genes, TsSPH1, TsYUC6, and TsBAHD occur only on the S-haplotype and appear to determine S-morph characteristics. TsSPH1 is expressed in filaments, TsYUC6 in anthers, and TsBAHD in styles. A long-homostyle mutant (Drh) did not possess TsBAHD while another long-homostyle mutant (Mhomo-H) possessed a substitution mutation in TsBAHD. Short-homostyle mutants did not express TsSPH1. The incompatibility system of Turnera joelii possessed a mutation that appears to be linked to S-locus. A possible mechanism of incompatibility is discussed which involves brassinosteroids and auxins."]},{"key":"dc:title","label":"Title","values":["Determining the Genes for Distyly in Turnera"]}]}],"canonical_facts":{"dc:contributor.advisor":["Shore, Joel S"],"dc:creator":["Hamam, Hasan Jihad"],"dc:date.accessioned":["2019-11-22T18:49:57Z"],"dc:date.available":["2019-11-22T18:49:57Z"],"dc:date.issued":["2019-11-22"],"dc:description.abstract":["Heterostyly promotes outbreeding and reduces pollen wastage. Distylous species have two mating types: L-morph and S-morph plants, which are genetically determined by the S-locus. It was hypothesized that the S-locus carries at least three tightly linked genes constituting a supergene. The S-locus genes responsible for distyly in Turnera had not been determined. Using deletion mapping and chromosome walking, the S- and s-haplotypes of the S-locus were constructed. Three hemizygous genes, TsSPH1, TsYUC6, and TsBAHD occur only on the S-haplotype and appear to determine S-morph characteristics. TsSPH1 is expressed in filaments, TsYUC6 in anthers, and TsBAHD in styles. A long-homostyle mutant (Drh) did not possess TsBAHD while another long-homostyle mutant (Mhomo-H) possessed a substitution mutation in TsBAHD. Short-homostyle mutants did not express TsSPH1. The incompatibility system of Turnera joelii possessed a mutation that appears to be linked to S-locus. A possible mechanism of incompatibility is discussed which involves brassinosteroids and auxins."],"dc:identifier.uri":["http://hdl.handle.net/10315/36742"],"dc:language":["en"],"dc:rights":["Author owns copyright, except where explicitly noted. Please contact the author directly with licensing requests."],"dc:subject":["Molecular biology"],"dc:title":["Determining the Genes for Distyly in Turnera"],"dc:type":["Electronic Thesis or Dissertation"]},"updated_at":"2026-07-24T06:33:34Z"}