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A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin

2010; Wiley; Volume: 28; Issue: 4 Linguagem: Inglês

10.1111/j.1756-1051.2010.00603.x

1756-1051

Iva Hodálová, Pavol Mered'a Jun, Alexandra Vinikarová, Vít Grulich, Olga Rotreklová,

Mediterranean and Iberian flora and fauna

Nordic Journal of BotanyVolume 28, Issue 4 p. 413-427 A new cytotype of Jacobaea vulgaris (Asteraceae): frequency, morphology and origin Iva Hodálová, Iva HodálováSearch for more papers by this authorPavol Mered'a Jun, Pavol Mered'a JunSearch for more papers by this authorAlexandra Vinikarová, Alexandra VinikarováSearch for more papers by this authorVít Grulich, Vít GrulichSearch for more papers by this authorOlga Rotreklová, Olga RotreklováSearch for more papers by this author Iva Hodálová, Iva HodálováSearch for more papers by this authorPavol Mered'a Jun, Pavol Mered'a JunSearch for more papers by this authorAlexandra Vinikarová, Alexandra VinikarováSearch for more papers by this authorVít Grulich, Vít GrulichSearch for more papers by this authorOlga Rotreklová, Olga RotreklováSearch for more papers by this author First published: 02 September 2010 https://doi.org/10.1111/j.1756-1051.2010.00603.xCitations: 5 I. Hodálová ([email protected]) and P. Mered'a, Inst. of Botany, Slovak Academy of Sciences, Dúbravská cesta 14, SK–845 23 Bratislava, Slovak Republic. – A. Vinikarová, V. Grulich and O. Rotreklová, Inst. of Botany and Zoology, Masaryk Univ., Kotlářská 2, CZ–611 37 Brno, Czech Republic. Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract Jacobaea vulgaris subsp. vulgaris (syn. Senecio jacobaea subsp. jacobaea) constitutes an intricate polyploid complex distributed in Europe. Four cytotypes have been reported in this species, three with euploid (diploid, tetraploid and octoploid; 2n=20, 40 and 80) and one with aneuploid (2n=32) chromosome numbers. Here we report that the diploid chromosome number (2n=20) reported from Bulgaria is due to misidentification with Jacobaea aquatica. On the other hand, we have discovered a new, hexaploid (2n=6x=60) cytotype within J. vulgaris subsp. vulgaris using flow cytometry. The new cytotype occurs within four sympatric populations of otherwise tetraploid and octoploid plants in Pannonia (one locality in the eastern Czech Republic and two localities in southwestern Slovakia) and in Podillya (one locality in western 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. Three mixed populations with hexaploid plants were subjected to detailed morphological and pollen fertility analyses. Multivariate morphometric analysis reveals partial separation of tetraploid and octoploid plants, whereas hexaploid individuals are similar in morphology to octoploids. In comparison with tetraploids, 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 compared to tetraploids and octoploids. References Abbott, R. J. and Lowe, A. J. 2004. Origins, establishment and evolution of new polyploid species: Senecio cambrensis and S. eboracensis in the British Isles. Biol. J. Linn. Soc. 82: 467–474. Andersson, S. 2001a. Fitness consequences of floral variation in Senecio jacobaea (Asteraceae): evidence from a segregating hybrid population and a resource manipulation experiment. Biol. J. Linn. Soc. 74: 17–24. Andersson, S. 2001b. 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Citing Literature Volume28, Issue4August 2010Pages 413-427 ReferencesRelatedInformation