Staminal wing and a novel secretory structure of asclepiads

Autor(es)

Demarco, Diego

• Tipo de documento: Artigo Científico
• Fonte: BOTANY; v. 95, n. 7, p. 763-772, JUL 2017.
• Citações Web of Science: 1

Resumo

Asclepiads (Asclepiadoideae, Apocynaceae) have morphologically complex flowers with a wide range of secretory structures related to their defense and pollination. A striking feature of the flowers is the presence of a guide rail formed by staminal wings, which is related to the guidance of the pollinator to the pollinarium translator and the retention of the pollinium. Previous analyses of floral ontogeny in asclepiads detected the presence of a possible gland on the staminal wing during flower development. The goal of the present study was to verify the occurrence of a secretory structure on the staminal wing and its possible function through ontogenetic and histochemical analyses of the presumed gland. Staminal wings are formed early in developing flowers, and a gland is originated in the outer and inner margins of the guide rail in all species. This gland releases a secretion composed of mucilage and lipids, which likely assists in the introduction of the pollinator appendage into the narrow guide rail by lubricating the staminal wings. The gland degenerates before anthesis, increasing the space within the guide rail and enabling the introduction of the pollinarium. This new secretory structure may be present in floral buds of all asclepiads. (AU)

• Processo FAPESP: 04/09729-4 - Glândulas de órgãos vegetativos aéreos e florais de espécies de Asclepiadoideae R. Br. ex Burnett (Apocynaceae s.l.) de Mata de Restinga do estado de São Paulo
• Beneficiário: Diego Demarco
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 03/12595-7 - Composição florística, estrutura e funcionamento da Floresta Ombrófila Densa dos Núcleos Picinguaba e Santa Virgínia do Parque Estadual da Serra do Mar, estado de São Paulo, Brasil
• Beneficiário: Carlos Alfredo Joly
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 02/11881-3 - Estruturas secretoras florais e coleteres foliares de Aspidosperma Mart & Zucc. e Blepharodon Decne. (Apocynaceae s.l.) de Cerrado
• Beneficiário: Diego Demarco
• Modalidade de apoio: Bolsas no Brasil - Mestrado