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Acta Agronómica

Print version ISSN 0120-2812

Abstract

CAETANO, Creucí Maria et al. Cytogenetic of Vasconcellea species (Caricaceae). Acta Agron. [online]. 2008, vol.57, n.4, pp.241-245. ISSN 0120-2812.

This work aims to know basic aspects of cytogenetics of mountain papayas' or 'papayuelas', Vasconcellea species (Caricaceae), originated from Ecuador and Colombia. Flower buds were fixed in 3:1 acetic-alcohol solution for 24 hr, transferred to new solution and stored al low temperature. Both microsporocytes and pollen grains were stained with 1% acetic carmine. Meiosis phases and pollen viability were evaluated to describe chromosome behavior. We found that: 1) all tested species were diploid (2n=2x=18); 2) chromosome number of V. sphaerocarpa, V. longiflora and V. palandensis (2n=18) were by first time reported; 3) asymmetry level of chromosome complements indicated a evolution process in these species; 4) presence of numerous NOR in V. sphaerocarpa associated to micronucleoli corroborated its possible hybrid origin; and 5) V. cauliflora (42.98%) and V. cundinamarcensis (47.93%) presented the low percentage of pollen viability.

Keywords : Mountain papaya; Vasconcellea; meiotic behavior; pollen viability.

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