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New evidence of floral elaiophores and characterization of the oil flowers in the subtribe Oncidiinae (Orchidaceae)

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Abstract

Elaiophores seems to be uncommon in Orchidaceae; however, the number of known species with floral oil glands has increased in recent years, principally in Oncidiinae. Oil rewards are used by bees of the tribes Centridini, Tapinotaspidini and Tetrapediini. Our aims were to identify the presence of elaiophores and to describe their structure in species of Gomesa, Grandiphyllum and Trichocentrum, and to compare our results with other studies of elaiophores in Oncidiinae. We selected a set of characters presumably associated with oil production in flowers of Oncidiinae, which were evaluated using a cluster analysis to identify different floral morphologies of the oil flowers. The correlation between morphological types of oil flowers and species of pollinators was examined. The cluster analysis distinguished two groups of species, one of them principally linked with pollination by bees of genus Centris and the other type associated to species of Paratetrapedia and Tetrapedia. The evaluation of these results into a phylogenetic framework of the Oncidiinae, adding more evidence that species of this subtribe with similar floral morphology associated with floral oil secretion arise in many independent clades, in parallel evolution with the oil-bee pollination.

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Acknowledgements

This work was supported by FONCYT PICT 2013-1867 and CONICET PIP 2012-2014 (11220110100312). We thank to B. Galati and G. Zarlavsky for technical assistance, G. Sanchez for image processing, A. Torretta for the revision of manuscript and M. Bello and M. Lovisolo for providing plant material, and two anonymous reviewers for their constructive comments on this manuscript.

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Correspondence to Sandra S. Aliscioni.

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Handling editor: Louis P. Ronse De Craene.

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Online Resource 1. Data base used in the cluster analysis with the corresponding bibliography.

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Gomiz, N.E., Torretta, J.P. & Aliscioni, S.S. New evidence of floral elaiophores and characterization of the oil flowers in the subtribe Oncidiinae (Orchidaceae). Plant Syst Evol 303, 433–449 (2017). https://doi.org/10.1007/s00606-016-1382-7

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