Dysploidy and polyploidy trigger strong variation of chromosome numbers in the prayer-plant family (Marantaceae)
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TLDR
Dysploid variation, polyploidy and, to a lesser extend, hybridization may be the main factors in chromosome number evolution of the family Marantaceae.Abstract:
Karyotype analyses in species of the family Marantaceae (550 species, 31 genera) were conducted to shed light on the reported strong variation of chromosome number and size and the occurrence of polyploidy. Special attention was paid to the alterations in basic chromosome numbers, karyotypes and ploidy levels. Taxon sampling covered the whole distribution area of Marantaceae in Africa, Asia and America. We applied mitotic chromosome counting using conventional rapid squash techniques in 43 accessions (39 species, 16 genera), evaluated literature records for 51 species and conducted karyotype analyses. Eleven different somatic chromosome numbers were found (2n = 20, 22, 24, 26, 28, 33, 44, 36, 52, 65, 72). Based on the presumed basic chromosome numbers of x = 9, 10, 11, 12, 13, 14, this may correspond to diploid, triploid, tetraploid, pentaploid and octoploid levels, respectively. Dysploid variation, polyploidy and, to a lesser extend, hybridization may be the main factors in chromosome number evolution of the family. Our results also point to a certain degree of association with species diversification and geographical patterns.read more
Citations
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Comparative FISH analysis of Senna tora tandem repeats revealed insights into the chromosome dynamics in Senna.
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Multiple and independent rearrangements revealed by comparative cytogenetic mapping in the dysploid Leptostachyus group (Phaseolus L., Leguminosae).
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Tracing the Evolution of the Angiosperm Genome from the Cytogenetic Point of View
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The frequency of polyploid speciation in vascular plants
Troy E. Wood,Naoki Takebayashi,Michael S. Barker,Michael S. Barker,Itay Mayrose,Philip B. Greenspoon,Loren H. Rieseberg,Loren H. Rieseberg +7 more
TL;DR: It is established that 15% of angiosperm and 31% of fern speciation events are accompanied by ploidy increase, and frequency estimates are higher by a factor of four than earlier estimates and lead to a standing incidence of polyploid species within genera of 35% (n = 1,506).