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@article{1318480,
author = {Mandáková, Terezie and Schranz, M. Eric and Sharbel, Timothy F. and de Jong, Hans and Lysák, Martin},
article_location = {Hoboken (USA)},
article_number = {5},
doi = {http://dx.doi.org/10.1111/tpj.12849},
keywords = {Boechera; Brassicaceae; apomixis; chromosome fission; karyotype evolution; heterochromatin; centromere inactivation},
language = {eng},
issn = {0960-7412},
journal = {Plant Journal},
title = {Karyotype evolution in apomictic Boechera and the origin of the aberrant chromosomes},
url = {http://onlinelibrary.wiley.com/doi/10.1111/tpj.12849/epdf},
volume = {82},
year = {2015}
}
TY - JOUR
ID - 1318480
AU - Mandáková, Terezie - Schranz, M. Eric - Sharbel, Timothy F. - de Jong, Hans - Lysák, Martin
PY - 2015
TI - Karyotype evolution in apomictic Boechera and the origin of the aberrant chromosomes
JF - Plant Journal
VL - 82
IS - 5
SP - 785-793
EP - 785-793
PB - Wiley-Blackwell
SN - 09607412
KW - Boechera
KW - Brassicaceae
KW - apomixis
KW - chromosome fission
KW - karyotype evolution
KW - heterochromatin
KW - centromere inactivation
UR - http://onlinelibrary.wiley.com/doi/10.1111/tpj.12849/epdf
L2 - http://onlinelibrary.wiley.com/doi/10.1111/tpj.12849/epdf
N2 - Chromosome rearrangements may result in both decrease and increase of chromosome numbers. Here we have used comparative chromosome painting (CCP) to reconstruct the pathways of descending and ascending dysploidy in the genus Boechera (tribe Boechereae, Brassicaceae). We describe the origin and structure of three Boechera genomes and establish the origin of the previously described aberrant Het and Del chromosomes found in Boechera apomicts with euploid (2n=14) and aneuploid (2n=15) chromosome number. CCP analysis allowed us to reconstruct the origin of seven chromosomes in sexual B.stricta and apomictic B.divaricarpa from the ancestral karyotype (n=8) of Brassicaceae lineage I. Whereas three chromosomes (BS4, BS6, and BS7) retained their ancestral structure, five chromosomes were reshuffled by reciprocal translocations to form chromosomes BS1-BS3 and BS5. The reduction of the chromosome number (from x=8 to x=7) was accomplished through the inactivation of a paleocentromere on chromosome BS5. In apomictic 2n=14 plants, CCP identifies the largely heterochromatic chromosome (Het) being one of the BS1 homologues with the expansion of pericentromeric heterochromatin. In apomictic B.polyantha (2n=15), the Het has undergone a centric fission resulting in two smaller chromosomes - the submetacentric Het and telocentric Del. Here we show that new chromosomes can be formed by a centric fission and can be fixed in populations due to the apomictic mode of reproduction.
ER -
MANDÁKOVÁ, Terezie, M. Eric SCHRANZ, Timothy F. SHARBEL, Hans DE JONG a Martin LYSÁK. Karyotype evolution in apomictic Boechera and the origin of the aberrant chromosomes. \textit{Plant Journal}. Hoboken (USA): Wiley-Blackwell, 2015, roč.~82, č.~5, s.~785-793. ISSN~0960-7412. Dostupné z: https://dx.doi.org/10.1111/tpj.12849.
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