Floral sexual differentiation in Catasetum fimbriatum (Catasetinae, Orchidaceae) exposed to different light intensities



Título del documento: Floral sexual differentiation in Catasetum fimbriatum (Catasetinae, Orchidaceae) exposed to different light intensities
Revue: Lankesteriana
Base de datos: PERIÓDICA
Número de sistema: 000401384
ISSN: 1409-3871
Autores: 1
2
3
4
Instituciones: 1Centro Universitario Herminio Ometto, Departamento de Ciencias Biologicas, Araras, Sao Paulo. Brasil
2Universidade Estadual Paulista "Julio de Mesquita Filho", Departamento de Ciencias Biologicas, Rio Claro, Sao Paulo. Brasil
3Universidade Federal de Sao Carlos, Departamento de Biotecnologia, Sao Carlos, Sao Paulo. Brasil
4Universidade de Sao Paulo, Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Sao Paulo. Brasil
Año:
Periodo: Abr
Volumen: 16
Número: 1
Paginación: 47-56
País: Costa Rica
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Analítico, descriptivo
Resumen en inglés To elucidate the factors which control the flower phenotypic plasticity of Catasetum fimbriatum, studies focusing the floral development of the species were performed. The treatments were: high light intensity (1613 μmol.m-2.s-1); low light intensity (454 μmol.m-2.s-1) and mean light intensity (827 μmol.m-2.s-1). The floral morphology and anatomy were analyzed to evaluate of the sequence of tissue development involved in the sexual differentiation. We found the presence of cell cluster with meristematic features in the ovaries and gynostemium of the male and female diclinous flowers. These are responsible for the definition of the sexual expression of the species, in the dependence of the environmental stimulus, related to the endogenous concentration of ethylene, allowing, consequently, the dedifferentiation and re-differentiation of those clusters in the sexual determination of the flowers. There were no anatomical differences in floral tissues in different treatments
Disciplinas: Biología
Palabras clave: Angiospermas,
Fisiología vegetal,
Desarrollo floral,
Efectos de la luz,
Plasticidad fenotípica,
Determinación sexual,
Catasetum fimbriatum,
Orchidaceae
Keyword: Biology,
Angiosperms,
Plant physiology,
Floral development,
Light effects,
Phenotypic plasticity,
Sex determination,
Catasetum fimbriatum,
Orchidaceae
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