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Variability of the 5S and 45S rDNA sites and phylogenetic relationships in Passiflora
Cytologically, species of Passiflora are diploids, although some polyploids have been registered. de Melo and Guerra (pp. 309-316) show that the number and location of 5S and 45S rDNA are consistent with the hypothesis of x = 6 as the probable ancestral genome for the genus.
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