Inflorescence and floral development of Dahlstedtia species (Leguminosae: Papilionoideae: Millettieae)

Autor(es)

Teixeira, Simone de Padua ^[1] ; Ranga, Neusa Taroda ^[2] ; Tucker, Shirley C. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Ciencias Farmaceut, BR-14040903 Ribeirao Preto, SP - Brazil

^[2] Univ Estadual Paulista, Dept Bot & Zool, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[3] Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 - USA

• Tipo de documento: Artigo Científico
• Fonte: FLORA; v. 204, n. 10, p. 769-781, 2009.
• Citações Web of Science: 10

Resumo

Inflorescence and floral development of two tropical legume trees, Dahlstedtia pinnata and Dahlstedlia pentaphylla, occurring in the Atlantic Forest of south-eastern and southern Brazil, were investigated and compared with other papilionoids. Few studies have been made of floral development in tribe Millettieae, and this paper is intended to fill that gap in our knowledge. Dahlstedtia species have an unusual inflorescence type among legumes, the pseudoraceme, which comprises axillary units of three or more flowers, each with a subtending bract. Each flower exhibits a pair of opposite bractcoles. The order of flower initiation is acropetal; inception of the floral organs is as follows: sepals (5), petals (5), carpel (1) plus outer stamens (5) and finally inner stamens (5). Organ initiation in sepal, petal and inner stamen whorls is unidirectional; the carpel cleft is adaxial. The vexillum originates from a tubular-shaped primordium in mid-development and is larger than other petals at maturity, covering the keels. The filament tube develops later after initiation of inner-stamen primordia. Floral development in Dahlstedtia is almost always similar to other papilionoids, especially species of Phaseoleae and Sophoreae. But one important difference is the precocious ovule initiation (open carpel with ovules) in Dahlstedtia, the third citation of this phenomenon for papilionoids. No suppression, organ loss or anomalies occur in the order of primordia initiation or structure. Infra-generic differences in the first stages of ontogeny are rare; however, different species of Dahlstedtia are distinguished by the differing distribution pattern of secretory cavities in the flower. (C) 2009 Elsevier GmbH. All rights reserved. (AU)

• Processo FAPESP: 97/11242-0 - Estudos sobre o desenvolvimento floral, o sistema reprodutivo e a embriologia em Dahlstedtia Malme (Leguminosae, Papilionoideae)
• Beneficiário: Simone de Pádua Teixeira
• Modalidade de apoio: Bolsas no Brasil - Doutorado