Floral nectaries of Heliocarpus popayanensis and Luehea divaricata (Malvaceae-Grewioideae): structure and ultrastructure
Elsa C. Lattar A B F , Beatriz G. Galati C , Constanza S. Carrera D E and María S. Ferrucci A B D
+ Author Affiliations
- Author Affiliations
A Instituto de Botánica del Nordeste (IBONE-UNNE-CONICET).
B Cátedra de Morfología de Plantas Vasculares, Facultad de Ciencias Agrarias, Universidad del Nacional del Nordeste, Corrientes, Argentina.
C Universidad de Buenos Aires, Facultad de Agronomía, Depto. de Recursos Naturales y Ambiente, Cátedra de Botánica General, Buenos Aires, Argentina.
D Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET).
E Instituto de Fisiología y Recursos Genéticos Vegetales, CIAP-INTA, Córdoba, Argentina.
F Corresponding author. Email: elsilattar@gmail.com
Australian Journal of Botany 66(1) 59-73 https://doi.org/10.1071/BT17086
Submitted: 18 May 2017 Accepted: 13 December 2017 Published: 31 January 2018
Abstract
The structure and ultrastructure on floral nectaries of Heliocarpus popayanensis Kunth. and Luehea divaricata Mart (Malvaceae-Grewioideae) were investigated for the first time. The floral nectaries of the analysed species are structured (can be recognised macroscopically and microscopically) and of trichomatic type. Significant morphological differences were observed between the nectaries of perfect and pistillate flowers of H. popayanensis, as well as between nectaries of this species and those of the related species, Triumfetta rhomboidea Jacq. The volume of nectar produced in the perfect and pistillate flowers of H. popayanensis and in the perfect flowers of L. divaricata presents significant differences that could be related to the rewards offered to flower visitors. No differences were observed in ultrastructure features of the glandular trichomes between H. popayanensis and L. divaricata. Nectar accumulation occurs between the wall and the cuticle. The predominant floral visitors in perfect and pistillate flowers of H. popayanensis were bees, and less frequently flies; whereas for L. divaricata were wasps, bumblebees, butterflies and beetles. Our results support the inclusion of each genus in different tribes according to the recent tribal classification based on molecular and morphological data of the subfamily Grewioideae.
Additional keywords: floral visitors, Grewioideae, multivariate analysis, nectar, nectary structure, secretory trichomes.
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