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Statements

Subject Item
n2:RIV%2F00216224%3A14310%2F10%3A00044966%21RIV11-MSM-14310___
rdf:type
skos:Concept n19:Vysledek
dcterms:description
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. 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.
dcterms:title
A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin
skos:prefLabel
A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin
skos:notation
RIV/00216224:14310/10:00044966!RIV11-MSM-14310___
n3:aktivita
n14:P n14:Z
n3:aktivity
P(LC06073), Z(MSM0021622416)
n3:cisloPeriodika
4
n3:dodaniDat
n15:2011
n3:domaciTvurceVysledku
n17:2957906 n17:6175031
n3:druhVysledku
n9:J
n3:duvernostUdaju
n16:S
n3:entitaPredkladatele
n11:predkladatel
n3:idSjednocenehoVysledku
244737
n3:idVysledku
RIV/00216224:14310/10:00044966
n3:jazykVysledku
n6:eng
n3:klicovaSlova
Senecio jacobaea; Asteraceae; ploidy level; habitat differentiation; habitat differentiation; evolutionary dynamics; distribution patterns; hexaploid cytotypes; flowering plants; floral variation; Eastern Alps; fitness
n3:klicoveSlovo
n4:habitat%20differentiation n4:Senecio%20jacobaea n4:Asteraceae n4:distribution%20patterns n4:floral%20variation n4:Eastern%20Alps n4:flowering%20plants n4:ploidy%20level n4:fitness n4:evolutionary%20dynamics n4:hexaploid%20cytotypes
n3:kodStatuVydavatele
DK - Dánské království
n3:kontrolniKodProRIV
[1830FF254121]
n3:nazevZdroje
Nordic Journal of Botany
n3:obor
n8:EF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
5
n3:projekt
n10:LC06073
n3:rokUplatneniVysledku
n15:2010
n3:svazekPeriodika
28
n3:tvurceVysledku
Rotreklová, Olga Vinikarová, Alexandra Grulich, Vít Mereďa, Pavel Hodálová, Iva
n3:wos
000281551400004
n3:zamer
n18:MSM0021622416
s:issn
0107-055X
s:numberOfPages
15
n13:organizacniJednotka
14310