Floral ontogeny in Dipterygeae (Fabaceae) reveals new insights into one of the earliest branching tribes in papilionoid legumes

Autor(es)

Leite, Viviane Goncalves ^{[1, 2]} ; Mansano, Vidal Freitas ^[3] ; Teixeira, Simone Padua ^[1]

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 Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Biol, BR-14040901 Ribeirao Preto, SP - Brazil

^[3] Inst Pesquisa Jardim Bot Rio de Janeiro, DIPEQ, BR-22460030 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Botanical Journal of the Linnean Society; v. 174, n. 4, p. 529-550, APR 2014.
• Citações Web of Science: 11

Resumo

Flowers of Dipterygeae (Fabaceae, Papilionoideae) exhibit an unusual petaloid calyx. The two adaxial sepals are large and petaloid, and the three abaxial sepals form a three-toothed lobe. The goal of this study was to elucidate the ontogenetic pathways of this peculiar calyx in light of the floral development of the three genera that comprise the tribe. Floral buds of Dipteryx alata, Pterodon pubescens and Taralea oppositifolia were analysed using scanning electron microscopy and light microscopy. The order of bracteole and sepal initiation varies among the species. The androecium is asymmetric. The carpel cleft is positioned to the right or to the left, and is opposite the adaxial antepetalous stamen. The peculiarity of the calyx becomes noticeable in the intermediate stages of floral development. It results from the differential growth of the sepal primordia, in which the abaxial and lateral primordia remain diminutive during floral development, compared with the adaxial ones that enlarge and elongate. Bracteoles, abaxial sepals, petals and anthers are appendiculate, except in T. oppositifolia, in which the appendices were not found in bracteoles or anthers. These appendices comprise secretory canals or cavities. Considering that the ontogenetic pathway for the formation of the petaloid calyx is similar and exclusive for Dipterygeae, it might be a potential synapomorphy for the group, with the presence of secretory canals in the appendices of abaxial and lateral sepals and petals. (c) 2014 The Linnean Society of London, Botanical Journal of the Linnean Society, 2014, 174, 529-550. (AU)

• Processo FAPESP: 09/05976-0 - Técnicas para estudo de desenvolvimento floral
• Beneficiário: Viviane Gonçalves Leite
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 08/57487-0 - Desenvolvimento floral em especies de leguminosae
• Beneficiário: Simone de Pádua Teixeira
• Modalidade de apoio: Auxílio à Pesquisa - Regular