Data/hora: 09/06/2024 17:09:29

Provedor de dados: | 52
País: | Brazil
Título: | Cytogenetic studies in some species of Passiflora L. (Passifloraceae): a review emphasizing Brazilian species
Autores: | Souza,Margarete Magalhães; Pereira,Telma N. Santana; Vieira,Maria Lúcia Carneiro.
Data: | 2008-04-01
Ano: | 2008
Palavras-chave: | Karyotype; Banding; Meiotic behavior; Pollen viability; Nuclear DNA content; FISH.
Resumo: | The Passifloraceae is represented by species of tropical and subtropical origin. The Passiflora is the richest genus with approximately 450 species, 200 of them being native to Brazil. Recent karyological studies have reported the basic chromosome number for the Passiflora genus as x = 6, whereas x = 9, x = 10 and x = 12 were established as secondary basic numbers. High rates of fertility occur in most Passiflora species, since both meiotic index and pollen viability are above 90%. Unusual meiotic behavior has been described in some taxa. Unviable pollen were observed in some diploids species. The genome size varies from 1.83 to 5.36 pg, and significant interspecific variance has been observed. Studies using the FISH methodology have shown that there are two to three rDNA 45S sites and one 5S site in the species analyzed. In this review, information about the above-mentioned studies is presented and discussed in detail.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000200003
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132008000200003
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.51 n.2 2008
Fonte: | info:eu-repo/semantics/openAccess