| HODÁLOVÁ, Iva, Pavel MEREĎA, Alexandra VINIKAROVÁ, Vít GRULICH and Olga ROTREKLOVÁ. A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin. Nordic Journal of Botany. Kodaň, 2010, vol. 28, No 4, p. 413-427. ISSN 0107-055X. |
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@article{901344,
author = {Hodálová, Iva and Mereďa, Pavel and Vinikarová, Alexandra and Grulich, Vít and Rotreklová, Olga},
article_location = {Kodaň},
article_number = {4},
keywords = {Senecio jacobaea; Asteraceae; ploidy level; habitat differentiation; habitat differentiation; evolutionary dynamics; distribution patterns; hexaploid cytotypes; flowering plants; floral variation; Eastern Alps; fitness},
language = {eng},
issn = {0107-055X},
journal = {Nordic Journal of Botany},
title = {A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin},
volume = {28},
year = {2010}
}
TY - JOUR
ID - 901344
AU - Hodálová, Iva - Mereďa, Pavel - Vinikarová, Alexandra - Grulich, Vít - Rotreklová, Olga
PY - 2010
TI - A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin
JF - Nordic Journal of Botany
VL - 28
IS - 4
SP - 413-427
EP - 413-427
SN - 0107055X
KW - Senecio jacobaea
KW - Asteraceae
KW - ploidy level
KW - habitat differentiation
KW - habitat differentiation
KW - evolutionary dynamics
KW - distribution patterns
KW - hexaploid cytotypes
KW - flowering plants
KW - floral variation
KW - Eastern Alps
KW - fitness
N2 - Jacobaea vulgaris subsp. vulgaris constitutes an intricate polyploid complex distributed in Europe. Four chromosome numbers have been reported in this species: 2n=20, 40, 80 and 32. Chromosome number 2n=20 reported from Bulgaria is due to misidentification with J. aquatica. We discovered new hexaploid (2n=6x=60) cytotype occuring within four sympatric populations of otherwise tetraploid and octoploid plants in the Czech Republic, Slovakia and Ukraine. The frequency of hexaploid individuals within 76 studied populations is very low (only 10 of 693 analysed plants), and hexaploids probably represent hybrids between tetraploid and octoploid plants. Multivariate morphometric analysis reveals partial separation of tetraploid and octoploid plants, whereas hexaploid individuals are similar to octoploids. Octoploids and hexaploids exhibit slightly longer ray florets, involucral bracts and tubular florets and more hairy outer achenes. Hexaploid plants display larger pollen grains and lower pollen fertility.
ER -
HODÁLOVÁ, Iva, Pavel MEREĎA, Alexandra VINIKAROVÁ, Vít GRULICH and Olga ROTREKLOVÁ. A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin. \textit{Nordic Journal of Botany}. Kodaň, 2010, vol.~28, No~4, p.~413-427. ISSN~0107-055X.
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