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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Morphological diversity and function of the stigma in Ficus species (Moraceae)

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Autor(es):
Teixeira, Simone Padua [1] ; Costa, Marina F. B. [1, 2] ; Basso-Alves, Joao Paulo [2, 3] ; Kjellberg, Finn [4] ; Pereira, Rodrigo A. S. [5]
Número total de Autores: 5
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 Estadual Campinas, PPG Biol Vegetal, Inst Biol, Av Bandeirantes 3900, BR-14040901 Campinas, SP - Brazil
[3] DIPEQ, Inst Pesquisa Jardim Bot Rio de Janeiro, Rua Pacheco Leao 915, BR-22460030 Rio De Janeiro, RJ - Brazil
[4] Univ Paul Valery Montpellier, Univ Montpellier, CEFE UMR 5175, CNRS, EPHE, 1919 Route Mende, F-34293 Montpellier 5 - France
[5] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Av Bandeirantes 3900, BR-14040903 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 5
Tipo de documento: Artigo Científico
Fonte: ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY; v. 90, n. SI, p. 117-131, JUL 2018.
Citações Web of Science: 1
Resumo

The stigma plays several roles such as pollen hydration and selection, and pollen tube nutrition. In the Ficus-fig wasp mutualism, stigmata have an additional, almost unknown, function by representing a physical interface for both plant and wasp reproduction. We used light and electron microscopy to compare the detailed morphology of the stigmata of nine Ficus species of different sections and with different pollination modes and sexual expressions. Figs were collected at the stage when the stigmata were receptive for pollination. Stigmata in actively pollinated monoecious species have well developed papillae concentrated on the adaxial surface exposed towards the fig cavity. Conversely, the passively pollinated monoecious species have the whole surface of the stigmata covered by somewhat smaller papillae. In both actively and passively pollinated monoecious species these features are consistent, irrespective of style length. In all actively pollinated gynodioecious species, the stigmata of pistillate flowers were tubular or infundibuliform whereas in almost all actively pollinated monoecious species (except F. racemosa) the stigmata were filiform, with one branch or two asymmetric branches. In gynodioecious species the short-styled flowers in ``male{''} figs show a limited receptive surface with small papillae, while the stigmata of long-styled flowers in ``female{''} figs are covered by papillae that extend down the sides of the style, increasing the stigmatic surface. In actively pollinated species, stigmata are cohesive, forming a common surface for pollen tube germination ( = synstigma). The synstigma arrangement was quite variable: lax, cohesive or very cohesive, with entanglement by stigmatic papillae and stylar trichomes. Entanglement by stylar trichomes is common in gynodioecious species. The synstigma arrangement did not correlate with phylogeny or breeding system. This study is the first to report a very loose synstigma in actively pollinated monoecious Ficus species. Our analyses revealed that, in Ficus, the synstigma is functionally analogous to an extra-gynoecial compitum. Comparative studies will be required to test further hypotheses about the evolutionary determinants of such variation. (AU)

Processo FAPESP: 14/07453-3 - Desenvolvimento floral de espécies do clado urticoide
Beneficiário:Simone de Pádua Teixeira
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/02374-2 - Sinestigma de espécies neotropicais de Ficus L. (Moraceae) e seu papel no mutualismo figo-vespa de figo
Beneficiário:Marina Fernanda Bortolin Costa
Linha de fomento: Bolsas no Brasil - Doutorado