| Texto completo | |
| Autor(es): |
Leme, Flavia M.
[1, 2]
;
Schonenberger, Jurg
[3]
;
Staedler, Yannick M.
[3]
;
Teixeira, Simone P.
[4]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, UNICAMP, Programa Posgrad Biol Vegetal, Inst Biol, R Monteiro Lobato 255, BR-13083862 Campinas, SP - Brazil
[2] Univ Fed Mato Grosso do Sul, Inst Biociencias, Lab Bot, BR-79070900 Campo Grande, MS - Brazil
[3] Univ Vienna, Dept Bot & Biodivers Res, Rennweg 14, AT-1030 Vienna - Austria
[4] Univ Sao Paulo, Dept Ciencias Farmaceut, Fac Ciencias Farmaceut Ribeirao Preto, Av Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Botanical Journal of the Linnean Society; v. 193, n. 1, p. 64-83, MAY 2020. |
| Citações Web of Science: | 4 |
| Resumo | |
Species of Cannabaceae are wind pollinated, have inconspicuous and reduced flowers that are pistillate, staminate and apparently perfect on the same individual or on different individuals, with a single-whorled perianth and a pseudomonomerous gynoecium. Our objective is to understand the developmental processes that lead to such a reduced flower morphology and polygamy in Cannabis sativa, Celtis iguanaea and Trema micrantha. Floral buds and flowers were processed for surface, histological examinations and 3D reconstructions of vasculature. The single-whorled perianth is interpreted as a calyx because the organs are robust, have a broad base, an acute apex and quincuncial aestivation and are opposite the stamens. Petals are absent from inception. The dicliny is established at different development stages: stamens or carpels are absent from inception (Cannabis sativa), initiated and aborted during early (Trema micrantha, before sporo/gametogenesis) or late (Celtis iguanaea, after sporo/gametogenesis) development. Furthermore, in all species studied the carpels are congenitally united and the pseudomonomerous nature of the gynoecium is confirmed. Glandular trichomes are distributed on the bracts, sepals, anther connective and receptacle. Special floral features shared by species of Cannabaceae include precocious ovule development and sepals that are each vascularized by one bundle. The reduced flowers of Cannabaceae are the result of the absence from inception and/or abortion of organs and even of a whole whorl at different developmental stages, which were probably selected in response to pressures exerted by the similar pollination mechanism. (AU) | |
| Processo FAPESP: | 14/07453-3 - Desenvolvimento floral de espécies do clado urticoide |
| Beneficiário: | Simone de Pádua Teixeira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |