Stages of development of the floral secretory disk in Tapirira guianensis Aubl. (Anacardiaceae), a dioecious species

Autor(es)

Dantas Toelke, Elisabeth E. A. ^[1] ; Galetto, Leonardo ^{[2, 3]} ; Machado, Silvia Rodrigues ^[4] ; Stecchahn Lacchia, Ana Paula ^[5] ; Carmello-Guerreiro, Sandra Maria ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, UNICAMP, Dept Bot, Inst Biol, BR-13083079 Campinas, SP - Brazil

^[2] Univ Nacl Cordoba, Inst Multidisciplinario Biol Vegetal CONICET UNC, RA-5000 Cordoba - Argentina

^[3] Univ Nacl Cordoba, FCEFyN, RA-5000 Cordoba - Argentina

^[4] Univ Estadual Paulista, Inst Biociencias, BR-18618000 Botucatu, SP - Brazil

^[5] Univ Estadual Paraiba, UEPB, Dept Biol, BR-8109790 Campina Grande, Paraiba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 179, n. 3, p. 533-544, NOV 2015.
• Citações Web of Science: 4

Resumo

The goal of this study was to analyse possible structural and ultrastructural differences between the secretory disk of male and functionally female flowers of Tapirira guianensis (Anacardiaceae) at different developmental stages. Studies were carried out using light, scanning and transmission electron microscopy. Biochemical tests were employed to determine the proportion of sugars in the nectar of the floral morphotypes: they were found to be similar, both predominantly composed of sucrose. In addition to sugars, lipids and phenolic substances were identified in anthetic flowers; thus, the secretory disk is a mixed secretion gland, also called a sensu lato nectary. During anthesis, granulocrine and eccrine secretory mechanisms occur in both floral morphotypes. After anthesis and fertilization of the functionally female flower, only the lipophilic and phenolic secretion continues until the early stages of fruit development. An intrastaminal secretory disk that produces both nectar and lipids is reported for the first time in Anacardiaceae. (C) 2015 The Linnean Society of London. (AU)

• Processo FAPESP: 11/02293-0 - Tapirira guianensis Aubl. (Anacardiaceae): uma investigação acerca das secreções produzidas na flor e no fruto
• Beneficiário: Elisabeth Emília Augusta Dantas Tölke
• Modalidade de apoio: Bolsas no Brasil - Mestrado