So small and so rich: diversity of floral resources in miniature Oncidiinae (Orchidaceae) and their relation to pollinators

Autor(es)

Pansarin, L. M. ^[1] ; Pansarin, E. R. ^[1] ; Alves-Dos-Santos, I. ^[2] ; Teixeira, S. P. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras, Dept Biol, BR-14040901 Ribeirao Preto, SP - Brazil

^[2] Univ Sao Paulo, Inst Biociencias, Dept Ecol, Sao Paulo - Brazil

^[3] Univ Sao Paulo, Fac Ciencias Farmaceut, Dept Ciencias Farmaceut, Ribeirao Preto - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Plant Biology; v. 23, n. 2 DEC 2020.
• Citações Web of Science: 0

Resumo

Oncidiinae is one of the most important subtribes among the Neotropical orchids, with an enormous diversity of floral morphology and secretory structures. This subtribe attracts a diverse array of pollinators which explore a variety of floral resources of its flowers. In this paper we provide a detailed investigation of the floral anatomy of 32 species of micro Oncidiinae. We applied histochemical tests in order to determine the diversity of the glands and rewards. The diversity of secretory flower structures and rewards was related to the group of pollinators known for this subtribe. We verified that half of the species (16 species, 50%) secrete oil as a resource, being pollinated by female of solitary bees. Species of some distinct nectar-secreting genera (four species, 12.5%) are pollinated by a range of nectar-searching animals. Species of the genus Notylia (four species, 12.5%) release floral perfumes that reward male Euglossini bees. Most of the investigated species (six species, 18.75%) possess osmophores that are involved in pollinator attraction. Two species of Capanemia (6.25%) do not offer any floral reward, suggesting that pollination by food deception is involved. There are strong variations in the anatomy of reward-producing structures and resources in Oncidiinae. The diversity of floral rewards affects the range of pollinators, which are related to the diversification of this subtribe throughout the Neotropics. The understanding of relationships between Oncidiinae species and their pollinators is crucial to our knowledge of the evolution of pollination systems in this huge plant family represented by the orchids. (AU)

• Processo FAPESP: 11/12720-2 - Anatomia, histoquímica e evolução das estruturas secretoras e recursos florais em Oncidiinae (Orchidaceae)
• Beneficiário: Ludmila Mickeliunas Pansarin
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado