Abstract
Because the detrimental effects of chromium (Cr) to higher plants have been poorly investigated, the present study was undertaken to verify the toxic attributes of hexavalent chromium [Cr(VI)] to plant mitotic microtubules (MTs), to determine any differential disruption of MTs during mitosis of taxonomically related species and to clarify the relationship between the visualized chromosomal aberrations and the Cr(VI)-induced MT disturbance. For this purpose, 5-day-old uniform seedlings of Vicia faba, Pisum sativum, Vigna sinensis and Vigna angularis, all belonging to the Fabaceae family, were exposed to 250 μM Cr(VI) supplied as potassium dichromate (K2Cr2O7) for 24, 72 and 120 h and others in distilled water serving as controls. Root tip samples were processed for tubulin immunolabelling (for MT visualization) and DNA fluorescent staining (for chromosomal visualization). Microscopic preparations of cell squashes were then examined and photographed by confocal laser scanning microscopy (CLSM). Cr(VI) halted seedling growth turning roots brown and necrotic. Severe chromosomal abnormalities and differential disturbance of the corresponding MT arrays were found in all mitotic phases. In particular, in V. faba MTs were primarily depolymerized and replaced by atypical tubulin conformations, whereas in P. sativum, V. sinensis and V. angularis they became bundled in a time-dependent manner. In P. sativum, the effects were milder compared to those of the other species, but in all cases MT disturbance adversely affected the proper aggregation of chromosomes on the metaphase plate, their segregation at anaphase and organization of the new nuclei at telophase. Cr(VI) is very toxic to seedling growth. The particular effect depends on the exact stage the cell is found at the time of Cr(VI) entrance and is species-specific. Mitotic MT arrays are differentially deranged by Cr(VI) in the different species examined, even if they are taxonomically related, while their disturbance underlies chromosomal abnormalities. Results furthermore support the view that MTs may constitute a reliable, sensitive and universal subcellular marker for monitoring heavy metal toxicity.
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Notes
The confocal laser scanning microscopy (CLSM) figures were obtained from seedlings treated with 250 μM Cr(VI) for 24 h, except for Fig. 5g that was treated for 72 h, and of equivalent controls. All CLSM figures are projections of serial optical sections unless otherwise stated. Both tubulin (microtubules—MTs) immunolocalization (green) and DNA staining (red) are shown, either single or merged. When figures of the same cell are used, they are identified by the same letter and numbered consecutively. Cells are placed with their longitudinal axis vertical in accordance with the normal orientation of the root.
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Acknowledgments
This research was financially supported by the Department of Botany, School of Biology, Aristotle University of Thessaloniki, Greece. We are grateful to Dr. Anastasia Tsingotjidou, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, Greece, for generously providing access to the Nikon D-Eclipse C1 CLSM, and to Dr. Takahiro Hamada (Kyoto University, Japan) for cordially providing seeds of V. angularis.
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Eleftheriou, E.P., Michalopoulou, V.A. & Adamakis, ID.S. Aberration of mitosis by hexavalent chromium in some Fabaceae members is mediated by species-specific microtubule disruption. Environ Sci Pollut Res 22, 7590–7599 (2015). https://doi.org/10.1007/s11356-014-3880-x
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DOI: https://doi.org/10.1007/s11356-014-3880-x