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https://locus.ufv.br//handle/123456789/22238
Tipo: | Artigo |
Título: | Oxypetalum banksii subsp. banksii: a taxon of Asclepiadaceae with an extragynoecial compitum |
Autor(es): | Vieira, M. F. Shepherd, G. J. |
Abstract: | The floral morphology of seven Oxypetalum species and, in particular, the spatial relationship between the five stigmatic chambers and two separate ovaries of their flowers with respect to transmission of the pollen tube are studied. In all species, except O. banksii subsp. banksii, floral morphology is similar to that in other Asclepiadeae, and the flowers pollinated with one pollinium develop only one follicle, which means compitum absence. In O. banksii subsp. banksii flowers, the secretory interstaminal tissue lines the inner walls of the stigmatic chambers as in the other species studied, but it also reaches the upper part of the inner surface of the filament tube, where it surrounds the styles, an unprecedented feature for Asclepiadaceae. This tissue secretes nectar and mucilage; the latter acts as transmitting medium for the growth of pollen tubes from pollinia inserted and hydrated in stigmatic chambers (“hyperstigmas”). Mucilage also functions as an extragynoecial compitum: in flowers pollinated with one pollinium both carpels develop into a follicle. |
Palavras-chave: | Compitum Floral morphology Hyper- stigma Oxypetalum Pollen tube pathway |
Editor: | Plant Systematics and Evolution |
Tipo de Acesso: | Springer Nature Switzerland AG. |
URI: | http://dx.doi.org/10.1007/s00606-002-0204-2 http://www.locus.ufv.br/handle/123456789/22238 |
Data do documento: | 14-Out-2002 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | texto completo | 3,99 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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