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Botanical Sciences
versão On-line ISSN 2007-4476versão impressa ISSN 2007-4298
Resumo
PAQUINI-RODRIGUEZ, Sara Lucía; MELENDEZ-RAMIREZ, Virginia; TUN-GARRIDO, Juan e PARRA-TABLA, Víctor. Dicogamia y sistema de compatibilidad en el árbol tropical Gymnopodium floribundum (Polygonaceae). Bot. sci [online]. 2024, vol.102, n.1, pp.54-67. Epub 13-Fev-2024. ISSN 2007-4476. https://doi.org/10.17129/botsci.3366.
Background:
Gymnopodium floribundum is a dominant tree in the seasonally tropical dry forests of Yucatan, Mexico. This species shows a large floral display size during short periods, but a very low seed-set has been reported.
Questions:
What type of dichogamy does G. floribundum exhibit? What is its compatibility system?
Study species:
G. floribundum, a dichogamous tree of importance in beekeeping.
Study sites and dates:
Xtmakuil, Yucatan. February-March and November-December 2022.
Methods:
Floral sexual function synchrony and sexual expression was recorded during the flowering season. The compatibility system was evaluated with a hand-pollination experiment.
Results:
Intra-floral overlap of sexual functions was low (< 2 %), but relatively high between flowers of different inflorescences (0.48 ± 0.13, Mean ± SD) and between flowers of different trees (0.64 ± 0.11, Mean ± SD). Mature fruit production by hand self-pollination was low (ca. 3 %) and 6 times lower with respect to cross.
Conclusions:
G. floribundum shows complete intrafloral dichogamy, but incomplete intra- and interindividual dichogamy. Sexual expression changed throughout flowering, from predominant male bias to female. Although G. floribundum is self-compatible, the results suggest a wide advantage of cross-pollination over self-pollination.
Palavras-chave : floral sexual synchrony; compatibility index; inbreeding depression index; sexual expression; tree pollination.