Stipular extranuptial nectaries new to Polygala: morphology and ontogeny

Autor(es)

Andrade De Aguiar-Dias, Ana Cristina ^[1] ; Yamamoto, Kikyo ^[2] ; Castro, Marilia De Moraes ^[2]

Afiliação do(s) autor(es)

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

^[2] Univ Estadual Campinas, Dept Biol Vegetal, Inst Biol, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 166, n. 1, p. 40-50, MAY 2011.
• Citações Web of Science: 4

Resumo

Although taxonomic studies indicate that approximately one-third of the genera of Polygalaceae have nodal glands, few anatomical data are available on the structure and ontogeny of these secretory organs. We studied the as yet unknown origin, structure and function of such glands in Polygala laureola. During field observations, we detected glucose in the secretion using Glicofita Plus (R) and visitors were recorded. Vegetative shoot apices and nodal glands were examined using light microscopy and scanning electron microscopy. The presence of glucose in the secretion allowed us to identify these nodal glands as extranuptial nectaries. Secretory cells occupy a medullary position and are surrounded by phloem. Vascular bundles are concentric, and xylem is only observed at the basal region of the nectary. Nectar is released during the daytime through a pore at the top of the nectary. A stipular origin was confirmed by the fact that the procambial strand is connected to the leaf trace, opposite the leaf gap. The occurrence of stipular extranuptial nectaries in a nodal position is new to Polygala. (C) 2011 The Linnean Society of London, Botanical Journal of the Linnean Society, 2011, 166, 40-50. (AU)

• Processo FAPESP: 04/09728-8 - Estudos estruturais em espécies de Polygala L. (Polygalaceae) de Mata de Restinga e Cerrado do estado de São Paulo
• Beneficiário: Ana Cristina Andrade de Aguiar
• 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