Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

Margarete Magalhães de Souza; Telma N. Santana Pereira; Leandro da Cruz Silva; Daniela Soares da Silva Reis; Cláudia Pombo Sudré

doi:10.1508/cytologia.68.165

Karyotype of Six Passiflora Species Collected in the State of Rio de Janeiro

Margarete Magalhães de Souza, Telma N. Santana Pereira, Leandro da Cruz Silva, Daniela Soares da Silva Reis, Cláudia Pombo Sudré

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Keywords: Passiflora spp., passion fruit, karyotype, mitotic chromosomes, total haploid chromatin length, asymmetry index

JOURNAL OPEN ACCESS

2003 Volume 68 Issue 2 Pages 165-171

DOI https://doi.org/10.1508/cytologia.68.165

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Abstract

It was described karyotypes of 6 species (2n=18) collected in Rio de Janeiro, P. alata, P. edmundoi, P. malacophylla, P. mucronata, P. galbana, P. quadrangularis. To do that young root tips were either obtained from seedling or adult plants. The arm ratio for each chromosome (r), total haploid chromatin length (THC), and asymmetry index (TF%) were calculated. Some differences as THC, TF%, position of the centromere, and number, type and position of satellites were observed among the species studied. The species showed metacentric and submetacentric chromosomes, except P. galbana that showed only metacentric chromosomes. P. malacophylla revealed the smallest THC (14.67 μm) while P. quadrangularis revealed the largest (33.58 μm). The karyotypes varied in relation to other specimens studied and this result, allied to chromosome segregation studies, suggests the existence of intraspecific karyotypic variation in Passiflora species.

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