| 高温胁迫下差不嘎蒿和冷蒿的生理变化及其抗热性研究 |
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| 引用本文： | 王海鸥,周瑞莲.高温胁迫下差不嘎蒿和冷蒿的生理变化及其抗热性研究[J].中国沙漠,1999,19(Z1):55-58. |
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| 作者姓名： | 王海鸥 周瑞莲 |
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| 作者单位： | 1. 中国科学院兰州沙漠研究所, 兰州 730000;2. 兰州大学干旱农业生态国家重点实验室, 兰州 730000;3. 中国科学院兰州冰川冻土研究所冻土工程国家重点实验室, 兰州 730000 |
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| 基金项目： | 本文得到96-920-13-02、49890330、980121、KE-952-91-218、KE-95 T-04-01-04项目的资助 |
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| 摘 要： | 通过室内测定差不嘎蒿和冷蒿两种植物在气温由30℃升到60℃过程中叶片相对含水量(RWC)、质膜相对透性、过氧化物歧化酶(SOD)和过氧化物酶(POD)活性及蛋白质和丙二醛(MDA)含量的变化,分析研究了两种植物对沙地高温逆境环境的生理适应机理。结果表明:受到高温胁迫时,两种植物叶片含水量都趋于下降,但冷蒿的抗高温脱水能力强于差不嘎蒿;高温对两种植物的伤害主要是由于自由基伤害所引起的膜损伤,其中差不嘎蒿的SOD、POD由于热稳定性差,在高温下失活,从而没有发挥清除自由基作用,使质膜严重受损。而冷蒿的SOD和POD由于热稳定性强,对膜具有重要的保护作用,减低了高温伤害;从两种植物膜透性及MDA和蛋白质含量、SOD、POD活性变化趋势和幅度来看,冷蒿较差不嘎蒿更为耐热。
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| 关 键 词： | 差不嘎蒿 冷蒿 高温胁迫 生理变化 |
Physiological Changes and High temperature Resistence of Artemisia Halodendron and A. Frigida |
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| WANG Hai-ou,ZHOU Rui-lian.Physiological Changes and High temperature Resistence of Artemisia Halodendron and A. Frigida[J].Journal of Desert Research,1999,19(Z1):55-58. |
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| Authors: | WANG Hai-ou ZHOU Rui-lian |
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| Institution: | 1. Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 730000, China;2. State Key Lab of Arid Agroecology of Lanzhou University, Lanzhou 730000, China;3. State Key Lab of Frozen Soil Engineering, Institute of Glaciology and Geocryology, CAS, Lanzhou 730000, China |
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| Abstract: | The physiological adaptability mechanism of Artemisia halodendron and A. frigida under high temperature stress in sandy environment was discussed in this paper. The changes of water content in leaves (RWC), permeability, activity of superoxide Dismutase (SOD) and Peroxidase (POD), and content of dissoluble protein and malonaldehyde (MDA) in Artemisia halodendron and A. frigida had been measured by increasing temperature from 30℃ to 60℃. The results showed: ① Although both plants' RWC decreased, A. frigida's leaves resisted water loss better than A. halodendron. ② A. frigida had stronger heat endurance and less membrane damage viewed from change tendency of two plants' membrane permeability, content of MDA and dissoluble protein, and activity of SOD and POD. ③ The main cause of high temperature damage to the two plants was membrane damage due to free radical injury. SOD and POD of A. halodendron had poor thermal stability, so they lost activity at high temperature to clear free radical, which induced high membrane damage. However, SOD and POD's excellent stability of A. frigida had a significant influence on membrane stability. |
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| Keywords: | Artemisia halodendron A frigida High temperature stress Physiological change |
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