储存马铃薯块茎中的超氧化物歧化酶、过氧化氢酶和α-生育酚含量。
Superoxide Dismutase, Catalase, and alpha-Tocopherol Content of Stored Potato Tubers.
机构信息
Department of Horticultural Science, University of Minnesota, St. Paul, Minnesota 55108.
出版信息
Plant Physiol. 1990 Nov;94(3):1214-8. doi: 10.1104/pp.94.3.1214.
Activated oxygen or oxygen free radical mediated damage to plants has been established or implicated in many plant stress situations. The extent of activated oxygen damage to potato (Solanum tuberosum L.) tubers during low temperature storage and long-term storage is not known. Quantitation of oxygen free radical mediated damage in plant tissues is difficult. However, it is comparatively easy to quantitate endogenous antioxidants, which detoxify potentially damaging forms of activated oxygen. Three tuber antioxidants, superoxide dismutase, catalase, and alpha-tocopherol were assayed from four potato cultivars stored at 3 degrees C and 9 degrees C for 40 weeks. Tubers stored at 3 degrees C demonstrated increased superoxide dismutase activities (up to 72%) compared to tubers stored at 9 degrees C. Time dependent increases in the levels of superoxide dismutase, catalase, and alpha-tocopherol occurred during the course of the 40 week storage. The possible relationship between these increases in antioxidants and the rate of activated oxygen production in the tubers is discussed.
活性氧或氧自由基介导的植物损伤在许多植物胁迫情况下已经得到证实或暗示。在低温储存和长期储存过程中，马铃薯（Solanum tuberosum L.）块茎受到活性氧损伤的程度尚不清楚。植物组织中氧自由基介导的损伤的定量是困难的。然而，定量内源性抗氧化剂，其使潜在有害形式的活性氧解毒，相对容易。从四个马铃薯品种的块茎中测定了三种块茎抗氧化剂，超氧化物歧化酶，过氧化氢酶和α-生育酚，这些块茎在 3°C 和 9°C 下储存 40 周。与在 9°C 下储存的块茎相比，在 3°C 下储存的块茎中超氧化物歧化酶活性增加了 72％（高达 72％）。在 40 周的储存过程中，超氧化物歧化酶、过氧化氢酶和α-生育酚的水平呈时间依赖性增加。讨论了这些抗氧化剂增加与块茎中活性氧产生速率之间的可能关系。
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