2008
DOI: 10.1159/000163096
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Chromosome reduction in <i>Eleocharis maculosa </i>(Cyperaceae)

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… Show more

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Cited by 24 publications
(11 citation statements)
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References 49 publications
(27 reference statements)
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“…Our study showed that 45S rDNA is more variable in the number of sites than 5S, but it is unclear why the 45S rDNA sites never appear at interstitial positions, as observed with the 5S rDNA sites, since rearrangements are very common in the karyotype differentiation of the Cyperaceae (Vanzela et al 2003, Da Silva et al 2005, 2008b. Besides, it was unclear why the events that favor the multiplication and dispersion of 45S rDNA did not favor the same direction for 5S rDNA segments.…”
Section: Discussionmentioning
confidence: 52%
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“…Our study showed that 45S rDNA is more variable in the number of sites than 5S, but it is unclear why the 45S rDNA sites never appear at interstitial positions, as observed with the 5S rDNA sites, since rearrangements are very common in the karyotype differentiation of the Cyperaceae (Vanzela et al 2003, Da Silva et al 2005, 2008b. Besides, it was unclear why the events that favor the multiplication and dispersion of 45S rDNA did not favor the same direction for 5S rDNA segments.…”
Section: Discussionmentioning
confidence: 52%
“…The occurrence of 45S (terminal) and 5S rDNA (interstitial) sites in the same chromosome pair was found in E. flavescens, precisely because the 45S rDNA sites were distributed in the terminal regions of all chromosomes. The 5S rDNA hybridization signals were also detected at interstitial positions in E. sellowiana, E. geniculata, E. subarticulata and E. maculosa, but, in the last two species, 5S positioning was associated with chromosome rearrangements (Da Silva et al 2005Silva et al , 2008b. As E. sellowiana and E. geniculata exhibit regular meiosis (Da Silva et al 2010), the interstitial positioning of 5S rDNA in these species could not be explained by agmatoploidy and symploidy, but possibly by inversion.…”
Section: Discussionmentioning
confidence: 97%
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“…The occurrence of agmatoploidy in other genera of Juncaceae has been criticized because there is no evidence that they have holokinetic chromosomes (Schönswetter et al , 2007; Drábková, 2013). In all other genera where agmatoploidy has been reported, including the large genera Carex, Eleocharis, Schoenus, and others, it was used to indicate partial agmatoploidy (Luceño and Castroviejo, 1991; Da Silva et al. , 2008; Kaur et al.…”
Section: The Original Conceptsmentioning
confidence: 99%
“…Holocentric chromosomes can be very tolerant of dysploidy events, and this can be observed in the wide chromosome number variation of the Cyperaceae ( Da Silva et al , 2008 ; Roalson, 2008 ; Bureš and Zedek, 2014 ). Species of Eleocharis R. Br.…”
Section: Introductionmentioning
confidence: 99%