Diversity of floral nectary secretions and structure, and implications for their evolution in Anacardiaceae

Autor(es)

Toelke, Elisabeth D. ^[1] ; Bachelier, Julien B. ^[2] ; Lima, Elimar A. ^[1] ; Galetto, Leonardo ^{[3, 4]} ; Demarco, Diego ^[5] ; Carmello-Guerreiro, Sandra M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas UNICAMP, Dept Biol Vegetal, Inst Biol, BR-13083970 Campinas, SP - Brazil

^[2] Free Univ Berlin, Inst Biol, Struct & Funct Plant Divers Grp, Altensteinstr 6, D-14195 Berlin - Germany

^[3] Univ Nacl Cordoba, Inst Multidisciplinario Biol Vegetal CONICET UNC, Velez Sarsfield 1611, CC 495, RA-5000 Cordoba - Argentina

^[4] Univ Nacl Cordoba, FCEFyN, Velez Sarsfield 1611, CC 495, RA-5000 Cordoba - Argentina

^[5] Univ Sao Paulo, Inst Biociencias, Dept Bot, BR-05508090 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 187, n. 2, p. 209-231, JUN 2018.
• Citações Web of Science: 1

Resumo

The flowers of most Anacardiaceae have a floral nectary disk producing nectar rich in sugars. However, a recent study demonstrated that their nectaries might also produce other substances, including lipids and phenolic compounds. To explore the diversity of floral nectary production and (ultra)structure, and their potential for the systematics of Anacardiaceae, we studied seven genera and 13 species from the two subfamilies. We used spectrophotometry to identify sugars and histochemical tests for other substances, and electron and brightfield microscopy to study nectary (ultra)structure and secretory pathways. The composition of sugars and other substances can vary between closely related species and be more similar in species from different subfamilies, being of limited value for the systematics of the family. The general morphology and structure of the floral nectary and their secretory pathways appear to be conservative in the family, and, like the production of mixed secretions, they might be plesiomorphic. Three morphological types of floral nectaries are defined for the family: nectariferous disk with papillose (1) or smooth epidermis-type (2) and trichomatous-type (3). The secretions may be released both by granulocrine and eccrine mechanisms and exuded through nectarostomata or the cuticle. Further studies are needed to better understand their evolutionary and ecological implications in Anacardiaceae and other sapindalean lineages. (AU)

• Processo FAPESP: 14/18002-2 - Sapindales: filogenia e diversificação na região neotropical
• Beneficiário: José Rubens Pirani
• Modalidade de apoio: Auxílio à Pesquisa - Temático