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Annals of Botany 92: 265-272, 2003
© 2003 Annals of Botany Company

Variation in DNA-ploidy Levels of Reynoutria Taxa in the Czech Republic

BOHUMIL MANDÁK*,1, PETR PYSEK1, MARTIN LYSÁK2, JAN SUDA1,3, ANNA KRAHULCOVÁ1 and KATERINA BÍMOVÁ1,4

1 Institute of Botany, Academy of Sciences of the Czech Republic, CZ-252 43 Pruhonice, Czech Republic, 2 Laboratory of Molecular Cytogenetics and Cytometry, Institute of Experimental Botany, Sokolovská 6, CZ-772 00, Olomouc, Czech Republic, 3 Department of Botany, Charles University, Benátská 2, CZ-128 01, Prague, Czech Republic and 4 Institute of Applied Ecology, Czech Agricultural University Prague, CZ-281 63 Kostelec nad Cernymi lesy, Czech Republic

* For correspondence. E-mail mandak{at}ibot.cas.cz

Received: 22 November 2002; Returned for revision: 12 March 2003; Accepted: 7 May 2003

The genus Reynoutria is represented by four taxa in the Czech Republic: Reynoutria japonica var. japonica, R. japonica var. compacta, R. sachalinensis and R. xbohemica. By using flow cytometry, cytological variability within the genus is described based on 257 Reynoutria samples. The varieties of R. japonica are cytologically uniform, var. japonica is exclusively octoploid (2n = 8x = 88) and var. compacta occurs only as a tetraploid (2n = 4x = 44), but R. sachalinensis and R. xbohemica exhibit some variation in chromosome numbers. Reynoutria sachalinensis is predominantly tetraploid (2n = 4 x = 44), but also occurs occasionally as hexaploid and octoploid cytotypes. The most common ploidy level in R. xbohemica is hexaploid (2n = 6x = 66), but tetraploid and octoploid clones were also found. The four taxa occurring in the Czech Republic are described briefly and the possible origins of the cytotypes discussed.

Key words: Clonality, Fallopia, flow cytometry, hybridization, invasion, Polygonaceae, polyploidy, Reynoutria japonica var. japonica, R. japonica var. compacta, R. sachalinensis, R. xbohemica.


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