Abscisic acid and the induction of desiccation tolerance in the extremely xerophilic liverwort Exormotheca holstii
Abscisic acid and the induction of desiccation tolerance in the extremely xerophilic liverwort Exormotheca holstii
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DOI：
10.1007/bf00714466
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发表时间：
1994-12
期刊：
影响因子：
4.3
通讯作者：
E. Hellwege;K. Dietz;O. Volk;W. Hartung
中科院分区：
文献类型：
--
作者：
E. Hellwege;K. Dietz;O. Volk;W. Hartung
脱落酸 (ABA) 诱导旱地苔 Exormotheca holstii 中形成一组蛋白质。其中一些具有类似于干燥玉米胚的脱水蛋白和Craterostigma plantagineum的干燥相关蛋白的免疫学特性。内源性 ABA 在干燥和补水循环过程中的波动似乎足够高，表明 ABA 作为应激激素的作用，从而作为应激相关蛋白质合成的内源性诱导剂。当菌体在水分充足的条件下培养较长时间时，耐干燥性就会消失；除非用外部 ABA 处理，否则此类菌体不能充分增加胁迫依赖性 ABA 生物合成，或形成干燥相关蛋白。再水化的菌体无法从快速失水中恢复，而经过 ABA 处理的非硬化菌体在两小时内恢复其光合作用活性。
Abscisic acid (ABA) induces formation of a set of proteins in the xerophilic liverwortExormotheca holstii. Some of them have immunological properties similar to the dehydrins of desiccated corn embryos and the desiccation-related proteins ofCraterostigma plantagineum. The fluctuations of endogenous ABA during cycles of desiccation and rehydration seem to be sufficiently high to indicate a role for ABA as a stress hormone and there by as an endogenous inductor of stress-related protein synthesis. Desiccation tolerance disappears when thalli are cultivated for a longer period under well-watered conditions; such thalli are not able to increase stress-dependent ABA biosynthesis sufficiently, or to form the desiccation-related proteins unless they are treated with external ABA. The rehydrated thalli cannot recover from a rapid water loss, while ABA-treated, non-hardened thalli regain their photosynthetic activity within two hours.