Publication details

Endopolyploidy is a common response to UV-B stress in natural plant populations, but its magnitude may be affected by chromosome type.

Authors

ZEDEK František PLAČKOVÁ Klára VESELÝ Pavel ŠMERDA Jakub ŠMARDA Petr HOROVÁ Lucie BUREŠ Petr

Year of publication 2020
Type Article in Periodical
Magazine / Source Annals of Botany
MU Faculty or unit

Faculty of Science

Citation
Web https://academic.oup.com/aob/article-abstract/126/5/883/5862361?redirectedFrom=fulltext
Doi http://dx.doi.org/10.1093/aob/mcaa109
Keywords Endopolyploidy; UV-B-absorbing compounds; endoreduplication index; flow cytometry; holocentric chromosomes; monocentric chromosomes; natural population; ultraviolet radiation
Description BACKGROUND AND AIMS: Ultraviolet-B radiation (UV-B) radiation damages the DNA, cells and photosynthetic apparatus of plants. Plants commonly prevent this damage by synthetizing UV-B-protective compounds. Recent laboratory experiments in Arabidopsis and cucumber have indicated that plants can also respond to UV-B stress with endopolyploidy. Here we test the generality of this response in natural plant populations, considering their monocentric or holocentric chromosomal structure. METHODS: We measured the endopolyploidy index (flow cytometry) and the concentration of UV-B-protective compounds in leaves of 12 herbaceous species (1007 individuals) from forest interiors and neighbouring clearings where they were exposed to increased UV-B radiation (103 forest+clearing populations). We then analysed the data using phylogenetic mixed models. KEY RESULTS: The concentration of UV-B protectives increased with UV-B doses estimated from hemispheric photographs of the sky above sample collection sites, but the increase was more rapid in species with monocentric chromosomes. Endopolyploidy index increased with UV-B doses and with concentrations of UV-B-absorbing compounds only in species with monocentric chromosomes, while holocentric species responded negligibly. CONCLUSIONS: Endopolyploidy seems to be a common response to increased UV-B in monocentric plants. Low sensitivity to UV-B in holocentric species might relate to their success in high-UV-stressed habitats and corroborates the hypothesized role of holocentric chromosomes in plant terrestrialization.
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