Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae)
In an attempt to track the chromosomal differentiation in the <i>Dichroplus elongatus</i> species group, we analyzed the karyotypes of four species with classical cytogenetic and mapping several multigene families through fluorescent <i>in situ</i> hybridization (FISH). We im...
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Formato: | Articulo |
Lenguaje: | Inglés |
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2017
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/87372 |
Aporte de: |
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I19-R120-10915-87372 |
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institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Naturales Dichroplus elongatus |
spellingShingle |
Ciencias Naturales Dichroplus elongatus Castillo, Elio R. D. Taffarel, Alberto Maronna, Maximiliano M. Cigliano, María Marta Palacios Gimenez, Octavio M. Cabral de Mello, Diogo C. Martí, Dardo A. Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
topic_facet |
Ciencias Naturales Dichroplus elongatus |
description |
In an attempt to track the chromosomal differentiation in the <i>Dichroplus elongatus</i> species group, we analyzed the karyotypes of four species with classical cytogenetic and mapping several multigene families through fluorescent <i>in situ</i> hybridization (FISH). We improved the taxon sampling of the <i>D. elongatus</i> species group adding new molecular data to infer the phylogeny of the genus and reconstruct the karyotype evolution. Our molecular analyses recovered a fully resolved tree with no evidence for the monophyly of <i>Dichroplus</i>. However, we recovered several stable clades within the genus, including the <i>D. elongatus</i> species group, under the different strategies of tree analyses (Maximum Parsimony and Maximum Likelihood). The chromosomal data revealed minor variation in the <i>D. elongatus</i> species group's karyotypes caused by chromosome rearrangements compared to the phylogenetically related <i>D. maculipennis</i> species group. The karyotypes of <i>D. intermedius</i> and <i>D. exilis</i> described herein showed the standard characteristics found in most Dichroplini, 2n = 23/24, X0♂ XX♀, Fundamental number (FN) = 23/24. However, we noticed two established pericentric inversions in <i>D. intermedius</i> karyotype, raising the FN to 27♂/28♀. A strong variation in the heterochromatic blocks distribution was evidenced at interespecific level. The multigene families' mapping revealed significant variation, mainly in rDNA clusters. These variations are probably caused by micro chromosomal changes, such as movement of transposable elements (TEs) and ectopic recombination. These observations suggest a high genomic dynamism for these repetitive DNA sequences in related species. The reconstruction of the chromosome character "variation in the FN" posits the FN = 23/24 as the ancestral state, and it is hypothesized that variations due to pericentric inversions has arisen independently three times in the evolutionary history of <i>Dichroplus</i>. One of these independent events occurred in the <i>D. elongatus</i> species group, where <i>D. intermedius</i> is the unique case with the highest FN described in the tribe Dichroplini. |
format |
Articulo Articulo |
author |
Castillo, Elio R. D. Taffarel, Alberto Maronna, Maximiliano M. Cigliano, María Marta Palacios Gimenez, Octavio M. Cabral de Mello, Diogo C. Martí, Dardo A. |
author_facet |
Castillo, Elio R. D. Taffarel, Alberto Maronna, Maximiliano M. Cigliano, María Marta Palacios Gimenez, Octavio M. Cabral de Mello, Diogo C. Martí, Dardo A. |
author_sort |
Castillo, Elio R. D. |
title |
Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
title_short |
Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
title_full |
Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
title_fullStr |
Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
title_full_unstemmed |
Phylogeny and chromosomal diversification in the <i>Dichroplus elongatus</i> species group (Orthoptera, Melanoplinae) |
title_sort |
phylogeny and chromosomal diversification in the <i>dichroplus elongatus</i> species group (orthoptera, melanoplinae) |
publishDate |
2017 |
url |
http://sedici.unlp.edu.ar/handle/10915/87372 |
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