title: Factors contributing to the regulation of thermoinhibition in Tagetes minuta L.
abstract: Thermoinhibition in Tagetes minuta achenes is tightly and rapidly regulated with regard to its imposition and release, with both processes occurring within 2-3h. Germination at high temperatures is almost exclusively regulated by the embryo, while the pericarp appears to play only a minor role. Thermoinhibition in T. minuta could not be alleviated by any single plant growth regulator application, but a combination of treatments that both reduced ABA levels and increased ethylene levels were able to restore germination at supraoptimal temperatures. This suggests a role for both ethylene and ABA in the imposition of thermoinhibition in this species.
authors.affiliation: Research Centre for Plant Growth and Development, School of Biological and Conservation Sciences, University of KwaZulu-Natal, Pietermaritzburg, Scottsville, South Africa.
authors.forename: Nicky J
authors.initials: NJ
authors.lastname: Taylor
authors.forename: Paul N
authors.initials: PN
authors.lastname: Hills
authors.forename: John D
authors.initials: JD
authors.lastname: Gold
authors.forename: Wendy A
authors.initials: WA
authors.lastname: Stirk
authors.forename: Johannes
authors.initials: J
authors.lastname: van Staden
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism; D018525:Germination; D007700:Kinetics; D012639:Seeds / Q000502:physiology; D031686:Tagetes / Q000196:embryology / Q000378:metabolism / Q000502:physiology*; D013696:Temperature
chemical_list: D000040:Abscisic Acid