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


  • Cristiano Pedroso-de-Moraes Biological Science Department of Centro Universitário Hermínio Ometto – UNIARARAS. Rua Maximiliano Baruto, 500, Jd. Universitário. CEP: 13.607-339. Araras/SP. Brasil
  • Thiago de Souza-Leal Biological Science Department of Universidade Estadual Paulista – UNESP. P.O. Box 199, CEP 13506-900. Rio Claro/SP. Brasil.
  • Alinne L. Saoncella Biothecnology Department of Universidade Federal de São Carlos – UFSCar. P.O. Box 198, Rodovia Anhanguera, CEP: 78005-970. Araras/SP. Brasil
  • Marcílio de Almeida Biological Science Department of Escola Superior de Agricultura Luiz de Queiróz/Universidade de São Paulo – ESALQ/USP. P.O. Box. 168. CEP: 13.915-231. Piracicaba/SP. Brasil




Orchid, sexual expression, anatomy


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. 


Download data is not yet available.



How to Cite

Pedroso-de-Moraes, C., de Souza-Leal, T., Saoncella, A. L., & de Almeida, M. (2016). Floral sexual differentiation in &lt;i&gt;Catasetum fimbriatum&lt;/i&gt; (Catasetinae, Orchidaceae) exposed to different light intensities. Lankesteriana: International Journal on Orchidology, 16(1). https://doi.org/10.15517/lank.v16i1.23746

Most read articles by the same author(s)