Keywords
pollination
seed dispersal
reproductive biology
phylogeny
systematics
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Copyright (c) 2026 Emerson Pansarin
Abstract
With more than 60 species, the Neotropics is the most species rich region among Vanilla. Currently, many Brazilian species have been described or rediscovered, and taxonomic realignments have been carried out based on integrative taxonomy. The accuracy in species delimitation is important for studies on phylogeny and ecology, and because some Brazilian vanilla seems to be inappropriate to human consumption. Vanilla is monophyletic, with three main lineages, two of which occur throughout the Neotropics. The pollination system of Neotropical Vanilla is not species-specific, and their flowers are commonly adapted to pollination by euglossine males. The pollination mechanism of euglossinophilous Vanilla is based on a combination of perfume collection and nectar seeking. At least one species, V. palmarum, is pollinated by hummingbirds representing an evolutionary disruption in the pollination system among Vanilla. With regards to seed dispersal, the mesocarp of species with dehiscent fruits are rich in raphid idioblasts that can be harmful to seed dispersers. For this reason, in Vanilla with dehiscent fruits, birds and mammals commonly access the sclerotic seeds through fruit valves. Seeds of Vanilla with indehiscent fruits are dispersed by terrestrial herbivores. Besides the nutritive rewards, fruits are rich in polyphenols that can be toxic or unpalatable to omnivores. The chemical scarification of seed coat by the digestive acids is crucial for synchronizing the biological processes involved in seed germination. The understanding of the processes involved in Vanilla reproduction is very important in the selection of favorable genotypes for commercial vanilla production.
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