对红景天冻害胁迫的抗逆性研究

目的研究不同品种红景天对冻害胁迫的抗逆性。方法以狭叶红景天(R.kirilowii)、大花红景天(R.crenulata)、唐古特红景天(R.Algida)、长鞭红景天(R.fastigiata)为材料,通过大田试验和实验室检测,研究冻害胁迫对不同品种的红景天出苗时间、出苗持续时间、出苗率、成活率、超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性的影响。结果冻害在出苗前发生时,对狭叶红景天的出苗情况影响最大,长鞭红景天最小。幼苗期发生冻害时,狭叶红景天成活率最小、抗逆性物质SOD和POD的活性升幅最小,冻害最严重;长鞭红景天成活率最大、SOD和POD的活性升幅最大,冻害最轻。4种红景天抗逆性强弱顺序依次为:长鞭红景天大花红景天唐古特红景天狭叶红景天。结论在甘肃省甘南地区引种栽培红景天时,选择长鞭红景天和大花红景天较易成功,其中以长鞭红景天为最佳。

Stress Resistance of Rhodiola under Freezing Injury Stress

Objective To study the stress resistance of Rhodiola under freezing injury stress. Methods With R.kirilowii, R.crenulata, R.Algida and R.fastigiata as the experimental materials, the effects of freezing injury stress on emerging time, duration of seedling emergence, emergence rate, surviving rate, the activity of SOD and POD were observed by field test and experimental detection. Results Before seeding, the effect of freezing injury stress on R.kirilowii was the largest, and that on R.fastigiata was the least. When injury stress happened during seedling stage, surviving rate, increase of SOD and POD activities of R.kirilowii was the least, indicating the freezing injury was severe. R.fastigiata was the best in those indexes. The stress resistance of Rhodiola was as follows：R.fastigiata 〉 R.crenulata 〉 R.Algida 〉 R.kirilowii. Conclusion R. fastigiata and R.crenulata are good choice in introduction and cultivation of Rhodiola in Gannan area of