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作 者 ：沙伟;王欢;师帅

期 刊 ：武汉植物学研究 2010年 28卷 2期 页码：246-249

关键词：东亚砂藓；复水；生理生化指标；

Keywords:Racomitrium japonicum, Rewatering, Physio-biochemical indexes,

摘 要 ：对经长期干旱的东亚砂藓(Racomitrium japonicum)材料按不同时间梯度复水处理,并测定游离脯氨酸含量、可溶性蛋白含量、超氧化物歧化酶(SOD)活性和过氧化物酶(POD)活性等4项生理指标.结果表明,经长期干旱的东亚砂藓4项生理指标在复水后2 d内恢复到对照水平,而在复水过程中变化趋势有所不同:可溶性蛋白含量经长期干旱后在植物体内积累,SOD活性较高,在复水过程中与游离脯氨酸含量变化趋势一致,呈现升高后降低的波动状态恢复到对照水平;而游离脯氨酸含量和POD活性经长期干旱后和对照一致,在复水过程中POD活性迅速升高而后很快恢复到对照水平.这4种生理指标从一定程度上反应了耐旱东亚砂藓具有不同于其它植物的旱后复水的特殊生理机制.

Abstract:After long-time drought,Racomitrium japonicum was rewatered at different time rates.The contents of free proline and soluble proteins and the activities of superoxide dismutase (SOD) and peroxidase (POD) were then determined.The results showed that,after rewatering of two days,all indexes in the droughty R.japonicum resumed to control level,but the extent of their change differed with rewatering time.Long-time drought induced the accumulation of soluble proteins in R.japonicum.The SOD activity and free proline showed a similar change in trend during the rewatering process,though they varied in both peak curve with rewatering time and resumption to control level.The POD activity in longtime droughty R.japonicumwas similar to the control.With increasing rewatering time,POD activity increased quickly to control level.These indexes shown that R.japonicum has a specific physiology mechanism for rewatering after drought,which is different from other plants.

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