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Chromosome numbers in the genus Mimosa L.: cytotaxonomic and evolutionary implications


Dahmer, N; Simon, M F; Schifino-Wittmann, M T; Hughes, C E; Miotto, S T S; Giuliani, J C (2011). Chromosome numbers in the genus Mimosa L.: cytotaxonomic and evolutionary implications. Plant Systematics and Evolution, 291(3-4):211-220.

Abstract

Abstract Chromosome numbers were determined for
125 accessions of 92 taxa of Mimosa from all five of
Barneby’s (Mem New York Bot Gard 65:1–835, 1991)
taxonomic sections. For 69 species, 1 subspecies and 8
varieties, chromosome numbers are presented for the first
time, for 6 species and 1 variety previously published data
have been confirmed and for 3 species and 2 varieties
different numbers were found. Results show that 74% of
the accessions were diploid (2n = 2x = 26) and 26%
polyploid, these mostly tetraploid (2n = 4x = 52) but with
two triploid (2n = 3x = 39). These results double the
number of Mimosa species for which the chromosome
count is known from less than 10% previously reported to
more than 20%, representing an important advance in the
cytotaxonomy of this legume genus. These results together
with literature data show that ca. 78% of Mimosa species
are diploid. Polyploids are present in most of the taxonomic
sections and in different lineages across the genus.
No particular chromosome number is restricted to a given
section or lineage. A possible relation between geography,
species distribution, polyploidy and invasiveness was
detected, however, further studies based on more accessions,
especially from higher latitudes, are required before
firm conclusions can be drawn.

Abstract

Abstract Chromosome numbers were determined for
125 accessions of 92 taxa of Mimosa from all five of
Barneby’s (Mem New York Bot Gard 65:1–835, 1991)
taxonomic sections. For 69 species, 1 subspecies and 8
varieties, chromosome numbers are presented for the first
time, for 6 species and 1 variety previously published data
have been confirmed and for 3 species and 2 varieties
different numbers were found. Results show that 74% of
the accessions were diploid (2n = 2x = 26) and 26%
polyploid, these mostly tetraploid (2n = 4x = 52) but with
two triploid (2n = 3x = 39). These results double the
number of Mimosa species for which the chromosome
count is known from less than 10% previously reported to
more than 20%, representing an important advance in the
cytotaxonomy of this legume genus. These results together
with literature data show that ca. 78% of Mimosa species
are diploid. Polyploids are present in most of the taxonomic
sections and in different lineages across the genus.
No particular chromosome number is restricted to a given
section or lineage. A possible relation between geography,
species distribution, polyploidy and invasiveness was
detected, however, further studies based on more accessions,
especially from higher latitudes, are required before
firm conclusions can be drawn.

Citations

13 citations in Web of Science®
14 citations in Scopus®
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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Systematic Botany and Botanical Gardens
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:2011
Deposited On:25 Nov 2011 13:03
Last Modified:05 Apr 2016 15:07
Publisher:Springer
ISSN:0378-2697
Publisher DOI:https://doi.org/10.1007/s00606-010-0382-2

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