Presumed domatia are actually extrafloral nectaries on leaves of Anacardium humile (Anacardiaceae)

Autor(es)

Ana Paula Stechhahn Lacchia ; Elisabeth Emilia Augusta Dantas Tölke ; Diego Demarco ; Sandra Maria Carmello-Guerreiro

• Tipo de documento: Artigo Científico
• Fonte: Rodriguésia; v. 67, n. 1, p. 19-28, Mar. 2016.

Resumo

Presumed domatia are actually extrafloral nectaries on leaves ofAnacardium humile (Anacardiaceae), a species from the Brazilian savannah, is associated with foraging ants, which leads to the description of the structure of its leaves as domatia. However, the ants collect secretions on the leaves, a phenomenon that inspired us to elucidate this structure. To this end, we conducted an analysis of the distribution, micromorphology, anatomy and histochemistry of these supposed domatia. They are located in the axil of thicker leaf veins and are composed of glandular trichomes which exude glucose; they are, therefore, described here as extrafloral nectaries (EFNs). The nectariferous trichomes are located at the same level as the other epidermal cells on young leaves, while in mature leaves they were found in depressions of the leaf blade. The secretory activity of EFNs is limited to juvenile phases, becoming degenerated in mature leaves. Carbohydrates and lipophilic compounds were detected in the produced secretion. It can be concluded that the presence of ants foraging leaves to collect from EFNs indicates a mutualistic interaction, with the plant providing a sugar resource to the ants in return for protection against herbivory since they are present in developing leaves. (AU)

• Processo FAPESP: 14/18002-2 - Sapindales: filogenia e diversificação na região neotropical
• Beneficiário: José Rubens Pirani
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 01/12178-1 - Anatomia, ultraestrutura e histoquímica das estruturas secretoras em órgãos reprodutivos de espécies de Anacardiaceae do cerrado no estado de São Paulo
• Beneficiário: Ana Paula Stechhahn Lacchia
• Linha de fomento: Bolsas no Brasil - Mestrado
• Processo FAPESP: 96/12345-5 - Reequipamento do herbário do Departamento de Botânica - IB/UNICAMP
• Beneficiário: Eliana Regina Forni Martins
• Linha de fomento: Auxílio à Pesquisa - Programa Infra-estrutura - Equipamentos
• Processo FAPESP: 03/13556-5 - Estruturas secretoras em órgãos vegetativos e reprodutivos de espécies de Anacardiaceae do Cerrado do estado de São Paulo: anatomia, histoquímica e ultra-estrutura
• Beneficiário: Ana Paula Stechhahn Lacchia
• Linha de fomento: Bolsas no Brasil - Doutorado Direto