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Cytogenet Genome Res. 2008;122(2):175-80. doi: 10.1159/000163096. Epub 2008 Dec 18.

Chromosome reduction in Eleocharis maculosa (Cyperaceae).

Author information

1
Laboratório de Biodiversidade e Restauração de Ecossistemas, Departamento de Biologia Geral, Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, PR, Brazil.

Abstract

Chromosome numbers in Cyperaceae lower than the typical basic number x = 5 have been described for only three species: Rhynchospora tenuis (n = 2), Fimbristylis umbellaris (n = 3) and Eleocharis subarticulata (n = 3). Eleocharis maculosa is recorded here as the fourth species of Cyperaceae that has a chromosome number lower than 2n = 10, with 2n = 8, 7 and 6. The karyotype differentiation in E. maculosa was studied using conventional staining (mitosis and meiosis), FISH with 45S and 5S rDNA and telomere probes. The results allow us to determine which chromosomes of the chromosome race with 2n = 10 fused to form the remaining reduced numbers, as well as to understand how the symploidy and translocation mechanisms were important in karyotype differentiation and the formation of chromosome races in Eleocharis.

PMID:
19096214
DOI:
10.1159/000163096
[Indexed for MEDLINE]

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