| Revue: | Lankesteriana |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000393494 |
| ISSN: | 1409-3871 |
| Autores: | Gerlach, Gunter1 |
| Instituciones: | 1Botanischer Garten Munchen-Nymphenburg, Munich, Baviera. Alemania |
| Año: | 2013 |
| Periodo: | Ago |
| Volumen: | 13 |
| Número: | 1-2 |
| Paginación: | 39-46 |
| País: | Costa Rica |
| Idioma: | Español |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Analítico, descriptivo |
| Resumen en inglés | The sexual dimorphism of the genera Catasetum and Cycnoches is now common knowledge to orchid growers and investigators. Female flowers of Catasetum are all non-resupinate with a hooded lip, whereas the male flowers can be non-resupinate with a hooded lip or resupinate with a differently shaped lip, depending on the species. Only with male flowers present can the species of a Catasetum can be determined. In Cycnoches , flowers of both sexes are resupinate with a slender and long, curved column, resembling a swan’s neck. The lip of male flowers of C. sect. Heteranthae is provided with finger-like projections, but female flowers of that section and those of C. sect. Cycnoches have an entire lip. Female flowers of both genera observed in the Botanical Garden of Munich bear pollinaria, but they are without any function. Slight movements of the female inflorescences of Catasetum cause the pollinaria to fall off, and as a result their presence is often overlooked. In female pollinaria of Catasetum the caudicles are absent, making pollination impossible in nature. Their pollen is germinable, and application of the pollinia to the stigma of the same flower yields viable seeds. The seldom- observed intermediate forms have a stigmatic cavity as in the male flowers. Their pollinaria are similar to those of the female flowers, so they are also non-functional. They do not serve either as males or females. In female Cycnoches , the anther cap does not fall off, so preventing pollination by such a pollinarium. The pollinia are encapsulated by the anther cap and so cannot come into contact with the stigma of another flower. Here, too, germination tests of the female pollen were positive. It is suspected that selfing of the female flowers here also will result in viable seeds. In both cases the female flowers are true hermaphrodites, but because of their limited male function one should think of them as functional female flowers. Male flowers, however, do not develop precu |
| Disciplinas: | Agrociencias, Biología |
| Palabras clave: | Plantas ornamentales, Anatomía e histología, Angiospermas, Reproducción y desarrollo, Orchidaceae, Dimorfismo sexual, Polinización, Catasetum, Cycnocches |
| Keyword: | Agricultural sciences, Biology, Ornamental plants, Anatomy and histology, Angiosperms, Reproduction and development, Orchidaceae, Sexual dimorphism, Pollination, Catasetum, Cycnocches |
| Texte intégral: | Texto completo (Ver HTML) |
