Abstract
Glutathione pool and redox status, as well as chlorophyll fluorescencewere measured in Tortula ruralis which was treated withheavy metals and exposed to different desiccation treatments. Two hours afterre-wetting, the ratio of oxidised glutathione to total glutathione poolreturnedto the steady state level (14%) in slowly dried unpolluted plants. Cdtreatment doubled this ratio, as did rapid drying without the heavy metaltreatment. When Cd and rapid drying were applied together, the ratio of GSSGreached 45% indicating a clear additive effect of these two stressfactors. RFd, a chlorophyll fluorescence parameter followed a similar pattern.Lead did not cause the depletion of the glutathione pool but increased theratioof GSSG. It is suggested that Cd and rapid desiccation exert their damageadditively. This might also entail a lowered degree of desiccation tolerance inareas polluted with metals and therefore a retreat of the mosses to mesicmicrohabitats.
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Takács, Z., Tuba, Z. & Smirnoff, N. Exaggeration of desiccation stress by heavy metal pollution in Tortula ruralis: a pilot study. Plant Growth Regulation 35, 157–160 (2001). https://doi.org/10.1023/A:1014481704892
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DOI: https://doi.org/10.1023/A:1014481704892