Buckland Sarah M, Price Adam H, Hendry George A F
NERC Unit of Comparative Plant Ecology, Department of Animal and Plant Sciences, The University, Sheffield S10 2TN, UK.
Ysgol Gwyddorau Biolegol, Coleg Prifysgol Gogledd Cymru, Bangor, Gwynedd LL57 2UW, UK.
New Phytol. 1991 Sep;119(1):155-160. doi: 10.1111/j.1469-8137.1991.tb01019.x.
Cochlearia atlantica is a species rich in ascorbic acid. After 4 days of intermittent drought treatment, there was a large decrease in the concentration of ascorbate and glutathione, functioning probably as radical scavengers (anti-oxidants). Although there was no increase in lipid peroxidation (a marker of oxygen radical damage), drought treatment did result in the destruction of chlorophyll and a decrease in protein. This species showed little or no change in the activities of five enzymes usually associated with the processing of, and protection from, activated forms of oxygen. Armeria maritima showed similar decreases in relative water content and dry weight after droughting, but a quantitatively smaller decrease in ascorbate with no loss of glutathione. Instead a major response to drought, in this species, was the marked increases in the activities of superoxide dismutasc and peroxidase. Despite these increases in enzymic defences against oxygen radicals, drought treatment resulted in increased lipid peroxidation. in A. maritima. It is concluded that ascorbic acid and glutathione may play a significant role in the response to drought in C. atlantica but protection in A. maritima is largely through enzymic processing of activated farms of oxygen.
大西洋辣根菜是一种富含抗坏血酸的物种。经过4天的间歇性干旱处理后，抗坏血酸盐和谷胱甘肽的浓度大幅下降，它们可能作为自由基清除剂（抗氧化剂）发挥作用。尽管脂质过氧化（氧自由基损伤的标志物）没有增加，但干旱处理确实导致了叶绿素的破坏和蛋白质含量的下降。该物种中通常与活性氧的处理和防护相关的五种酶的活性几乎没有变化或没有变化。海石竹在干旱后相对含水量和干重也有类似的下降，但抗坏血酸盐的下降幅度较小，谷胱甘肽没有损失。相反，该物种对干旱的主要反应是超氧化物歧化酶和过氧化物酶的活性显著增加。尽管针对氧自由基的酶防御增加了，但干旱处理导致海石竹中脂质过氧化增加。得出的结论是，抗坏血酸和谷胱甘肽可能在大西洋辣根菜对干旱的反应中发挥重要作用，但海石竹中的保护主要是通过对活性氧形式的酶处理来实现的。
