Holocentric chromosomes may be an apomorphy of Droseraceae

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Authors

KOLODIN Pavel CEMPÍRKOVÁ Hana BUREŠ Petr HOROVÁ Lucie VELEBA Adam FRANCOVÁ Jana ADAMEC Lubomír ZEDEK František

Year of publication 2018
Type Article in Periodical
Magazine / Source Plant Systematics and Evolution
MU Faculty or unit

Faculty of Science

Citation
Web https://link.springer.com/content/pdf/10.1007%2Fs00606-018-1546-8.pdf
Doi http://dx.doi.org/10.1007/s00606-018-1546-8
Keywords Aldrovanda;Dionaea;Drosera;Drosophyllum;Flow cytometry;Gamma irradiation;Holocentric chromosomes;Holokinetic chromosomes;Karyotype evolution;carnivory
Description Holocentric chromosomes have evolved in various plant and animal taxa, which suggests they may confer a selective advantage in certain conditions, yet their adaptive potential has scarcely been studied. One of the reasons may reside in our insufficient knowledge of the phylogenetic distribution of holocentric chromosomes across eukaryotic phylogeny. In the present study, we focused on Droseraceae, a carnivorous plant family with an unknown chromosomal structure in monotypic genera Dionaea and Aldrovanda, and a closely related monotypic family Drosophyllaceae. We used flow cytometry to detect holocentric chromosomes by measuring changes in the ratio of the number of G2 nuclei to the number of G1 nuclei in response to gamma irradiation and determined chromosomal structures in Aldrovanda vesiculosa, Dionaea muscipula, Drosera tokaiensis, and Drosera ultramafica from Droseraceae and Drosophyllum lusitanicum from Drosophyllaceae. We confirmed monocentric chromosomes in D. lusitanicum and detected holocentric chromosomes in all four Droseraceae. Our novel finding of holocentric chromosomes in monotypic genera Aldrovanda and Dionaea suggests that all Droseraceae may be holocentric, but to confirm that further research is needed due to previously reported conflicting results in Drosera rotundifolia.
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