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@article{808379,
author = {Mandáková, Terezie and Lysák, Martin},
article_location = {United States},
article_number = {October},
keywords = {Brassicaceae; comparative chromosome painting (CCP); karyotype evolution; chromosomal phylogeny},
language = {eng},
issn = {1040-4651},
journal = {Plant Cell},
title = {Chromosomal phylogeny and karyotype evolution in x=7 crucifer species (Brassicaceae)},
volume = {20},
year = {2008}
}
TY - JOUR
ID - 808379
AU - Mandáková, Terezie - Lysák, Martin
PY - 2008
TI - Chromosomal phylogeny and karyotype evolution in x=7 crucifer species (Brassicaceae)
JF - Plant Cell
VL - 20
IS - October
SP - 2559
EP - 2559
PB - AMER SOC PLANT BIOLOGISTS
SN - 10404651
KW - Brassicaceae
KW - comparative chromosome painting (CCP)
KW - karyotype evolution
KW - chromosomal phylogeny
N2 - Karyotype evolution in species with identical chromosome number but belonging to distinct phylogenetic clades is a longstanding question of plant biology, intractable by conventional cytogenetic techniques. Here, we apply comparative chromosome painting (CCP) to reconstruct karyotype evolution in eight species with x=7 (2n=14, 28) chromosomes from six Brassicaceae tribes. CCPdata allowed us to reconstruct an ancestral Proto-Calepineae Karyotype (PCK; n=7) shared by all x=7 species analyzed. The PCK has been preserved in the tribes Calepineae, Conringieae, and Noccaeeae, whereas karyotypes of Eutremeae, Isatideae, and Sisymbrieae are characterized by an additional translocation. The inferred chromosomal phylogeny provided compelling evidence for a monophyletic origin of the x=7 tribes. Moreover, chromosomal data along with previously published gene phylogenies strongly suggest the PCK to represent an ancestral karyotype of the tribe Brassiceae prior to its tribe-specific whole-genome triplication. As the PCK shares five chromosomes and conserved associations of genomic blocks with the putative Ancestral Crucifer Karyotype (n=8) of crucifer Lineage I, we propose that both karyotypes descended from a common ancestor. A tentative origin of the PCK via chromosome number reduction from n=8 to n=7 is outlined. Comparative chromosome maps of two important model species, Noccaea caerulescens and Thellungiella halophila, and complete karyotypes of two purported autotetraploid Calepineae species (2n=4x=28) were reconstructed by CCP.
ER -
MANDÁKOVÁ, Terezie and Martin LYSÁK. Chromosomal phylogeny and karyotype evolution in x=7 crucifer species (Brassicaceae). \textit{Plant Cell}. United States: AMER SOC PLANT BIOLOGISTS, 2008, vol.~20, October, p.~2559-2570. ISSN~1040-4651.
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