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Acta Botanica Brasilica

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

Resumen

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.  http://dx.doi.org/10.1590/S0102-33062003000100010.

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.

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