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

Authors

  • 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

DOI:

https://doi.org/10.15517/lank.v16i1.23746

Keywords:

Orchid, sexual expression, anatomy

Abstract

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. 

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Published

2016-04-13

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

Issue

2016: Lankesteriana: Volumen 16, Número 1

Section

Articles

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According to the Open Access policy promoted by the University of Costa Rica, all the papers published by Lankesteriana are licensed under the Creative Commons copyright and can be downloaded free of charge. The journal holds copyright and publishing rights under the CC BY-NC-ND 3.0 CR license.

Before the publication of the materials submitted by the author(s) in LANKESTERIANA, the author(s) hereby assign all rights in the article to the Lankester Botanical Garden.

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