渗透胁迫下塔藓的4种生理指标的变化

The effects of osmotic stress on four physiological characters of Rhytidiadel phus triquetrus

以塔藓为材料,用PEG6000进行模拟干旱处理,研究3种不同程度PEG胁迫下的4种生理指标的变化。 塔藓在受到轻度胁迫(10％PEG)时游离脯氨酸含量与对照相比稍变化,中度胁迫(20％PEG)和重度胁迫(30％PEG) 时先降后升又降;塔藓分别受到轻度胁迫(10％PEG)、中度胁迫(20％PEG)和重度胁迫(30％PEG)时可溶性蛋 白含量先降后升,但总是低于对照;塔藓在轻度胁迫(10％PEG)和重度胁迫(30％PEG)时SOD活性3d的变化 是先升后降,但达到最高点的时间不同;中度胁迫(20％PEG)SOD活性是先升后降又升,重度胁迫(30％PEG) 时SOD活性3d的变化是先升后降。POD活性在3种胁迫下总体的趋势是上升。塔藓的这4种生理指标不同与其 它大部分植物的变化,可能是由于苔藓植物有一种特有的诱导恢复器官的原因。

The Rhytidiadel phus triquetrus was used as experimental material and treated with the osmotic stress solution PEG6000.The changes of physiological index study were at three stress levels. The change of proline content of Rhytidiadel phus triquetru is only a little different form normal condition and decreased, increased and decreased in 20%PEG and 30%PEG water stress, and they were always less with under water stress than normal condition. The SOD activity of Rhytidiadelphus triquetru was increased in first and then decreased in 10%PEG and 30%PEG water stress in three clays and increased, decreased and increased in 20%PEG water stress. The POD activity of Rhytidiadel phus triquetru was always in three water stress levels . The physiological index changes of Rhytidiadel phus triquetrus were different form most of plants,the reason should he an active rehydration induced recovery mechanicsm apparently unique to hryophytes.