Calcium Toxicity and Tolerance in Lichens: Ca Uptake and Physiological Responses
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- 作者：Martin Bačkor ; Miriam Bačkorová ; Michal Goga ; Michal Hrčka
- 关键词：Calcicole ; Calcifuge ; Plants ; Stress ; Tolerance ; Uptake
- 刊名：Water, Air, & Soil Pollution
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：228
- 期：2
- 全文大小：
- 刊物类别：Earth and Environmental Science
- 刊物主题：Environment, general; Water Quality/Water Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Soil Science & Conservation; Hydrogeology; Climate Change/Climate Change Impacts;
- 出版者：Springer International Publishing
- ISSN：1573-2932
- 卷排序：228
文摘
Although differential sensitivity of lichens to calcium excess has been documented previously at the community level, ecophysiological studies, which would shed light on the calcifuge or calcicole nature of lichens, are virtually absent. In the present study, we compared physiological responses of two morphologically similar foliose lichens, Dermatocarpon miniatum (calcicole lichen) and Umbilicaria hirsuta (calcifuge lichen) to Ca excess (up to 100 mM). The degree of total Ca uptake by the lichens after 24-h prolonged exposure was compared with selected physiological markers including levels of assimilation pigments, chlorophyll a fluorescence, soluble proteins, ergosterol, TBARS, and hydrogen peroxide. Both tested lichens accumulated Ca from the applied solutes of CaCl2 by a dose-dependent manner, although excess of Ca did not change content of assimilation pigments in both tested lichens, as well as integrity of lichen symbiont membranes (tested as TBARS, K content, and ergosterol content) when compared to respective controls. However, we observed significant, concentration-dependent decrease of chlorophyll a fluorescence, content of soluble proteins, and hydrogen peroxide production in U. hirsuta, while in D. miniatum were all these parameters stable through all tested Ca concentrations.