Resumo

AMORIM, Juliane dos Santos; SOUZA, Margarete Magalhães; VIANA, Américo José Carvalho  e  FREITAS, Jôsie Cloviane de Oliveira. Self-, cross- and interspecific pollinations in Passiflora capsularis and P. rubra. Rev. bras. Bot. [online]. 2011, vol.34, n.4, pp. 537-544. ISSN 0100-8404.  http://dx.doi.org/10.1590/S0100-84042011000400007.

This study aimed to characterize the reproductive system of Passiflora capsularis L. and P. rubra L. In vivo controlled pollinations, in vitro pollen germination and pollen-ovule (P:O) ratio evaluation were conducted. In self-pollination, intraspecific and interspecific pollination, P. capsularis showed means of 62.5, 68.7 and 48.4% of fertilized flowers, while in P. rubra, the averages were 67.2, 62.5 and 46.9%, respectively. For in vitro germination, 52.2% of P. capsularis pollen grains germinated while in P. rubra, the percentage was 64.4. The P:O ratio was 22.4 for P. capsularis, and 27.4 for P. rubra, which included them in the category of obligatory autogamous. Passiflora capsularis and P. rubra can reproduce both by self-pollination and cross-pollination, and crossings between the two species succeeded though the success rate was lower than 50%. The characteristics of the reproductive system of both species allow the use of greater range of options on breeding methods for production of ornamental Passiflora plants.

Palavras-chave : in vivo pollination; in vitro germination; passion flower; pollen-ovule ratio.