Abstract
Acrocomia aculeata is an oleaginous palm widely distributed through the tropical and subtropical Americas that shows significant potential for agroindustrial use. Studies of floral structures can contribute to our knowledge of the evolutionary diversification of this genus and ecological aspects of its species as well as assist management and domestication programs. With the objective of characterizing the morphoanatomy of the flowers of A. aculeata, 20 inflorescences were collected in each of three natural populations growing in the northern region of Minas Gerais State, Brazil. Flowers at anthesis were evaluated biometrically and using standard plant anatomical procedures, and observed under light and scanning electron microscopy. The flowers showed wide biometric variability that was influenced by the collection area, the individuals examined, and the positions of the flowers on the inflorescence. Staminate flowers can have two whorls of petals, small anthers, and vestigial structures, with the development of an infertile carpel and rudimentary ovules. Defenses against herbivory include the presence of raphides in the anthers and pistillate flowers, fiber bundles, stegmata, and idioblasts containing phenols and raphides. Pollinators are attracted by the liberation of intense odors produced by osmophores located in the corolla, with pollen being the principal resource offered. Phenotypic plasticity, the structures involved in defending against herbivores and attracting pollinators, the numbers of flowers, and flowering synchrony contribute to the reproductive success of this species. The short period during which the stigmas remain receptive determines synchronous fertilization within the inflorescence.
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Acknowledgments
The authors would like to thank Petrobras for the research grant awarded to the first author and for financially supporting this project; the Fundação de Amparo a Pesquisa do Estado de Minas Gerais for its financial support (CRA APQ 01043/11) used, in part, in the photographic documentation of this project, and for the BIPDT grants to L.M. Ribeiro and M.O. Mercadante-Simões; the Núcleo de Microscopia e Microanálise da Universidade Federal de Viçosa (Dra. Aristéa Alves Azevedo and Gilmar Edilberto Valente - NMM/UFV) and the Núcleo de Apoio à Pesquisa em Microscopia Eletrônica Aplicada à Pesquisa Agropecuária (Dr. Francisco André Ossamu Tanaka - NAP/MEPA).
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Mazzottini-dos-Santos, H.C., Ribeiro, L.M., Mercadante-Simões, M.O. et al. Floral structure in Acrocomia aculeata (Arecaceae): evolutionary and ecological aspects. Plant Syst Evol 301, 1425–1440 (2015). https://doi.org/10.1007/s00606-014-1167-9
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DOI: https://doi.org/10.1007/s00606-014-1167-9