Abstract
Earlier, we have established that the European blackjack, which in many literary sources is cited as an invasive North American Bidens connata, was described by Carl Warnstorf back in 1895 as B. decipiens and had a hybrid origin (B. frondosa × B. cernua). In this study, we continue to compare the genomes of B. connata and B. decipiens by molecular genetics and cytological methods. The objects are the F1 offsprings of B. frondosa, B. connata, and B. cernua collected in 2018 from Minnesota and Wisconsin (USA), grown from seeds in the greenhouse conditions of N.V. Tsitsin Main Botanical Garden of Russian Academy of Sciences, as well as samples of B. decipiens, B. frondosa and B. cernua collected from Eastern Europe (Belarus and European Russia). The nucleotide sequences of nuclear (ITS 1–2) and chloroplast (trnL– trnF and rpl32–trnL) DNA were studied. Analysis of the ITS 1–2 site showed that B. connata individuals of North America are not hybrids. Analysis of the chloroplast DNA regions confirmed that both taxa, B. connata and B. decipiens, are evolutionarily close to B. cernua.
 Bangladesh J. Plant Taxon. 28(1): 1-10, 2021 (June)
Highlights
Bidens connata Muehl. ex Willd. is a North American species with a natural range from Alaska in the north to Mexico in the south (Strother and Weedon, 2006)
We have discovered that characters of that species are transitional between the North American invasive B. frondosa L. and the native B. cernua L. (Galkina et al, 2015), which may indicate a hybrid origin of B. decipiens
This study aims to compare the genomes of North American B. connata and European B. decipiens by molecular and cytological methods to confirm the non-identity of these taxa
Summary
Bidens connata Muehl. ex Willd. is a North American species with a natural range from Alaska in the north to Mexico in the south (Strother and Weedon, 2006). Is a North American species with a natural range from Alaska in the north to Mexico in the south (Strother and Weedon, 2006). At home, this species has high polymorphism, and several of its varieties are described that include B. connata var. In the second half of the XX century, American botanists based on the morphological characters suggested the hybridogenic nature of B. connata. They thought that the parental species of B. connata were B. frondosa L. and B. cernua L. Bidens decipiens Warnst. was described by Carl Warnstorf in 1895 from the European samples, but later on the plants with a set of similar characteristics were defined by European botanists as
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