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- W2092380327 abstract "Karyotypes of six species (in ten populations) of the genus Serjania and one species of the genus Urvillea were studied using root tip mitotic metaphases. All species of Serjania were diploids with 2n = 24 chromosomes and the species of Urvillea was octoploid with 2n = 86 chromosomes. Analysis of the karyotypes of Serjania showed that the species are differentiated by chromosomic structural changes. Chromosome lengths showed great differences among the species that may be explained by chromosomal deletion or addition. The basic chromosomic number is x = 12 for Serjania and x = 1 1 for Urvillea. In Urvillea the evolutionary trend may be toward polyploidy followed by reductional aneuploidy. The Giemsa (C-band) staining technique was applied in Serjania; however, no clear blocks of heterochromatin were observed. This result agrees with the presence of semireticulate nuclei. The Nucleolar Organizing Region (NOR-banding) technique was applied in S. communis and S. laruotteana, which showed one and two pairs stained, respectively. Variation in the number of nucleoli was observed among the different populations of Serjania. This variation could be explained by the presence of small nucleolar organizer regions that occur scattered along the genome and are not detected by the silver staining methodology." @default.
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- W2092380327 date "1995-05-01" @default.
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- W2092380327 title "Karyotypic study of some species ofSerjaniaandUrvillea(Sapindaceae; TribePaullinieae)" @default.
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- W2092380327 doi "https://doi.org/10.1002/j.1537-2197.1995.tb11509.x" @default.
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