MORFOLOGÍA FLORAL Y EMBRIOLOGÍA DE BEGONIA GRACILIS (BEGONIACEAE): SU RELEVANCIA EN LA MONOECIA

Elizabeth Chávez-García, Sonia Vázquez-Santana

Abstract


In this study the development of the male and female flowers of Begonia gracilis is described, using conventional histological and microscopic techniques. The aims were to clarify whether just one whorl is initiated on the meristem or if the flower begins as bisexual and later abortion occurs on androecium or gynoecium. The results show that the unisexuality is established in the floral meristem, because any floral morph develops atrophied organs. The female flowers develop a style that is trifurcate on the tip, forming three dry, bifid, papillate, and helically twisted stigmas. The ovule is crassinucellate, bitegmic and anatropous. The micropyle is amphistome. The male flowers develop free stamens and the gynoecium reminiscences are absent. The microspores tetrads are tetrahedric and isobilateral. The pollen grain is bicellular and tricolporate, with striate and verrugate-striate exine near to the apertures. Based on results we conclude that unisexuality in B. gracilis is established since the floral meristem, likely by mutations in homeotic genes that regulate the development of sexual whorls.

Keywords


Begonia; embryology; floral development; monoecy; unisexuality

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DOI: http://dx.doi.org/10.17129/botsci.469

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Botanical Sciences is an international peer-reviewed journal that publishes scientific papers in plant sciences. The arguments, figures / schemes / photographs, quality and the general contents of this publication are full responsibility of the authors, and not commit the Editor- in-Chief or the Sociedad Botánica de México.

Botanical Sciences year 8, Vol. 97, No. 2, April-June 2019. Quarterly publication edited and published by Sociedad Botánica de México A.C. (www.socbot.mx). Editor in Chief Salvador Arias, Jardín Botánico, Instituto de Biología, 3er Circuito s/n, Ciudad Universitaria, Delegación Coyoacán, C.P. 04510. Reserves of Rights to the Exclusive Use No. 04-2017-040716054100-203, digital-ISSN 2007-4476, both granted by the Instituto Nacional del Derecho de Autor. Responsible for updating the page Pedro López, email: plopez@escire.mx, eScire. Last update July 18, 2019.

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