Dichogamy and compatibility system in the tropical tree Gymnopodium floribundum (Polygonaceae)

keywords: floral sexual synchrony, compatibility index, inbreeding depression index, sexual expression, tree pollination

Abstract

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.

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Dichogamy and compatibility system in the tropical tree <em>Gymnopodium floribundum</em> (Polygonaceae)

References

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Published
2023-12-13
How to Cite
Paquini-Rodríguez, S. L., Meléndez-Ramírez, V., Tun-Garrido, J., & Parra-Tabla, V. (2023). Dichogamy and compatibility system in the tropical tree Gymnopodium floribundum (Polygonaceae). Botanical Sciences, 102(1), 54-67. https://doi.org/10.17129/botsci.3366
Section
ECOLOGY / ECOLOGÍA