EFFECT OF DESICCATION ON CATION LOCATION IN LICHENS
EFFECT OF DESICCATION ON CATION LOCATION IN LICHENS
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DOI：
10.1093/oxfordjournals.aob.a085730
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发表时间：
1979-01-01
期刊：
影响因子：
4.2
通讯作者：
BROWN, DH
中科院分区：
文献类型：
--
作者：
BUCK, GW;BROWN, DH
在 15 个地衣物种中进行了实验 [Umbilicaria pustulata、Cladonia coniocraea、Leptogium schraderi、Cladonia foliacea、Dermatocarpon miniatum、Platismatia glauca、Parmelia perlata、Hypogymnia physodes、Ramalina siliquosa、Dermatocarpon Fluviatile、Usnea subfloridana、Evernia prunastri、 Lichina pygmaea、Cladoniarangiformis、Peltigerahorizonis]来自一系列不同的生境，以比较干燥胁迫和非胁迫材料中的细胞阳离子位置。干燥导致某些物种细胞内钾和镁大量流失；损失可能与自然栖息地的可用水量有关。在渗漏过程中，一些阳离子固定在细胞壁阳离子交换位点上。固定的比例取决于释放的阳离子的性质和交换位点上已经存在的阳离子的性质。干燥胁迫的地衣可以通过潮湿环境孵化部分或全部恢复其原有的阳离子分布。提出了地衣的抗干燥性和恢复指数。可以与苔藓植物[Hypnum cupressiforme、Lophocolea cuspidata]进行比较，并得出关于它们各自的微环境的结论。
Experiments were performed in 15 lichen species [Umbilicaria pustulata, Cladonia coniocraea, Leptogium schraderi, Cladonia foliacea, Dermatocarpon miniatum, Platismatia glauca, Parmelia perlata, Hypogymnia physodes, Ramalina siliquosa, Dermatocarpon fluviatile, Usnea subfloridana, Evernia prunastri, Lichina pygmaea, Cladonia rangiformis, Peltigera horizontalis] from a range of different habitats, to compare cellular cation location in desiccation-stressed and -unstressed material. Desiccation caused significant intracellular K and Mg loss in some species; loss can be related to water availability in the natural habitat. During leakage, some cation immobilization occurs on cell wall cation exchange sites. The proportion immobilized depends on the nature of the cation released and the nature of cations already present on exchange sites. Desiccation-stressed lichens can partially or wholly recover their original cation distribution by humid environment incubation. Desiccation resistance and recovery indices for lichens are proposed. Comparisons can be made with bryophytes [Hypnum cupressiforme, Lophocolea cuspidata] and conclusions can be drawn about their respective micro-environments.