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首页> 外文期刊>Plant, Cell & Environment >Freeze avoidance: a dehydrating moss gathers no ice.
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Freeze avoidance: a dehydrating moss gathers no ice.

机译：避免结冰：脱水的苔藓不结冰。

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摘要

Using cryo-SEM with EDX fundamental structural and mechanical properties of the moss Ceratodon purpureus (Hedw.) Brid. were studied in relation to tolerance of freezing temperatures. In contrast to more complex plants, no ice accumulated within the moss during the freezing event. External ice induced desiccation with the response being a function of cell type; water-filled hydroid cells cavitated and were embolized at -4 degrees C while parenchyma cells of the inner cortex exhibited cytorrhysis, decreasing to ~20% of their original volume at a nadir temperature of -20 degrees C. Chlorophyll fluorescence showed that these winter acclimated mosses displayed no evidence of damage after thawing from -20 degrees C while GCMS showed that sugar concentrations were not sufficient to confer this level of freezing tolerance. In addition, differential scanning calorimetry showed internal ice nucleation occurred in hydrated moss at ~-12 degrees C while desiccated moss showed no evidence of freezing with lowering of nadir temperature to -20 degrees C. Therefore the rapid dehydration of the moss provides an elegantly simple solution to the problem of freezing; remove that which freezes.
机译：使用具有EDX的冷冻SEM进行青苔（Herw。）Brid苔藓的基本结构和力学性能。关于冷冻温度的耐受性进行了研究。与更复杂的植物相反，在冰冻事件期间，苔藓内没有积冰。外在的冰引起的干燥，其响应是细胞类型的函数;充满水的水合细胞空化并在-4°C处栓塞，而内皮层的实质细胞表现出细胞溶血作用，在-20°C的最低温度下会减少至其原始体积的〜20％。叶绿素荧光表明这些冬天已经适应-20摄氏度解冻后，苔藓未显示出破坏的迹象，而GCMS显示糖浓度不足以赋予该水平的冷冻耐受性。此外，差示扫描量热法显示，水合苔藓在〜-12摄氏度时发生内部冰核，而干燥苔藓未显示冻结现象，最低温度降至-20摄氏度。因此，苔藓的快速脱水提供了一种简洁的方法解决冻结问题;删除冻结的。

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