Evaluation of the importance of ionic and osmotic components of salt stress on the photosynthetic efficiency of epiphytic lichens.
Evaluation of the importance of ionic and osmotic components of salt stress on the photosynthetic efficiency of epiphytic lichens.
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DOI：
10.1007/s12298-022-01134-2
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发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Rola K
中科院分区：
文献类型：
--
作者：
Chowaniec K;Rola K
地衣是一种生活在各种恶劣环境中的自给自足的共生生物，盐胁迫可以显著地破坏地衣的功能。目的是测试盐和蔗糖对两种选择的附生地衣的光合效率的影响，这些地衣居住在土地的内部。首先，我们比较了不同浓度的盐溶液和蔗糖溶液的效果。其次，比较了具有相同渗透压的盐溶液和蔗糖溶液的效果。结果表明，短期盐胁迫导致FV/FM显著降低，叶绿素荧光参数和OJIP瞬变的变化幅度大于蔗糖诱导的渗透胁迫。这证明盐胁迫的负面影响主要与离子效应有关。离子应力的最有症状的影响是电子传递中捕获能量的利用率显著降低，从而下调电子传递。由于地衣对暂时缺水有抵抗力，离子胁迫可能比渗透胁迫本身产生更严重的后果。Hypogymnia physodes是更敏感的盐胁迫比Pseudevernia furfuracea，但光合效率的降低是不是永久性的，因为24 h后FV/FM恢复到健康地衣的水平特征。然而，反复暴露于盐可能会降低地衣的生命力生长沿着交通路线洒盐在冬季。最后，某些JIP测试参数的变化比FV/FM更强，因此它们可以更好地指示地衣的盐胁迫。在线版本包含补充材料，可通过10.1007/s12298-022-01134-2获得。
Salt stress can significantly disrupt the functioning of lichens which are self-sufficient symbiotic organisms inhabiting various severe environments. The aim was to test the effect of salt and sucrose on the photosynthetic efficiency of two selected epiphytic lichens inhabiting the interior of the land. Firstly, we compared the effect of salt and sucrose solutions of different concentrations. Secondly, the effect of salt and sucrose solutions with identical osmotic pressures was compared. The results showed that short-term salt stress leads to a significant reduction of FV/FM, greater changes in chlorophyll fluorescence parameters and OJIP transients compared to the osmotic effects induced by sucrose. This proved that the negative impact of salt stress is associated primarily with ionic effects. The most symptomatic effect of the ionic stress was a significant reduction of the utilisation of trapped energy in electron transport and thereby down-regulation of electron transfer. Since lichens are resistant to a temporary lack of water, ionic stress could have more serious consequences than osmotic stress itself. Hypogymnia physodes was more sensitive to salt stress than Pseudevernia furfuracea, but the reduction of photosynthetic efficiency was not permanent since after 24 h FV/FM returned to the level characteristic for healthy lichens. Nevertheless, repeated exposure to salt may reduce the vitality of lichens growing along communication routes sprinkled with salt in the winter season. Finally, the changes in certain JIP-test parameters were stronger than FV/FM, thus they could be better indicators of salt stress in lichens. The online version contains supplementary material available at 10.1007/s12298-022-01134-2.
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DOI：
10.1007/978-3-642-19106-0_6
发表时间：
2011-01-01
期刊：
PLANT DESICCATION TOLERANCE
影响因子：
--
作者：
Allan Green, T. G.;Sancho, Leopoldo G.;Pintado, Ana
通讯作者：
Pintado, Ana
影响因子：
5.4
作者：
Boisvert, Steve;Joly, David;Carpentier, Robert
通讯作者：
Carpentier, Robert
影响因子：
3.7
作者：
Bednarikova, Michaela;Vaczi, Peter;Bartak, Milos
通讯作者：
Bartak, Milos
影响因子：
5.7
作者：
Kalaji, Hazem M.;Rackova, Lydia;Sitko, Krzysztof
通讯作者：
Sitko, Krzysztof
影响因子：
4.2
作者：
BUCK, GW;BROWN, DH
通讯作者：
BROWN, DH