SciELO - Scientific Electronic Library Online

vol.17 número1Phanerogamic hydrophytes from the temporary swampy environments of coastal plains of northern Rio de Janeiro State, BrazilStrombomonas carinata sp. nov. and Strombomonas ferrazi sp. nov., two new Euglenophyceae from the state of Rio Grande do Sul, southern Brazil índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados




Links relacionados


Acta Botanica Brasilica

versión impresa ISSN 0102-3306versión On-line ISSN 1677-941X


VIEIRA, Milene Faria  y  GRABALOS, Rodrigo. Breeding system of Oxypetalum mexiae Malme (Asclepiadaceae), an endemic and endangered species of Viçosa, Minas Gerais, Brazil. Acta Bot. Bras. [online]. 2003, vol.17, n.1, pp.137-145. ISSN 0102-3306.

Results of open-pollination (exposed flowers), in natural population, and cross and self-pollination, in cultivated individuals, are reported in O. mexiae. This species occurs at the Reserva Florestal Mata do Paraíso, a forest fragment with 195ha, whose original vegetation is part of the phytogeographic unit of the Atlantic forest. O. mexiae is a climbing species of great dimension, which grows at the wood border, following the water flow. It is self-compatible, but spontaneous self-pollination does not occur for morphological reasons. Seeds of xenogamous (40%) and autogamous (50%) fruit sets presented a high viability (respectively, 99 and 100%). No fruit was produced in natural population, indicating that this species presents reproductive limitation. This limitation is imposed by a low level of pollination, which restricts the number of fruit-set, and herbivory, which impedes the developing fruits to reach maturation. The low level of pollination may be related to habitat fragmentation. Besides, O. mexiae habitat may further limit its distribution and abundance.

Palabras clave : habitat fragmentation; low fruit-set; Oxypetalum; self-compatibility.

        · resumen en Portugués     · texto en Portugués     · Portugués ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons