The uncommon cavitated secretory trichomes in Bauhinia s.s. (Fabaceae): the same roles in different organs

Autor(es)

Marinho, Cristina Ribeiro ^[1] ; Oliveira, Rejane Barbosa ^{[1, 2]} ; Teixeira, Simone Padua ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Av Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil

^[2] Univ Tecnol Fed Parana, Rua Cerejeira S-N, BR-85892000 Santa Helena, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 180, n. 1, p. 104-122, JAN 2016.
• Citações Web of Science: 8

Resumo

Cavitated secretory trichomes are characterized by a short or absent stalk that is connected to a secretory hollow head. They are rare structures in angiosperms; in Fabaceae, they have been recorded in only seven genera, including Bauhinia s. s. Because B. curvula and B. rufa exhibit glands that are responsible for attracting pollinators to flowers, this study aimed to test whether the cavitated secretory trichomes present in the flowers of these species have an attraction function. As leaf trichomes are commonly related to plant defence, comparative analyses of the morphology, ontogeny, ultrastructure and chemical profile of the secretory trichomes present in flowers and leaves were conducted. It was found that cavitated secretory trichomes are similar in their external morphology and development, regardless of the organ or species analysed. However, interspecific differences were found in the secretion process and chemical profile of the exudate. The differences found in the cavitated secretory trichomes between species indicate that they secrete distinct compounds, whereas the similarities found in these structures between vegetative and reproductive organs indicate that the cavitated trichomes have equivalent ecological functions within a species, probably in plant defence during organ development. (C) 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 180, 104-122. (AU)

• Processo FAPESP: 09/01057-0 - Anatomia floral de espécies de Leguminosae com polinização noturna enfatizando os osmóforos.
• Beneficiário: Cristina Ribeiro Marinho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/55434-7 - Estruturas secretoras em espécies vegetais de cerrado: abordagens morfológica, química e ecológica
• Beneficiário: Silvia Rodrigues Machado
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático