SUPEROXIDE-DISMUTASE, CATALASE, AND ALPHA-TOCOPHEROL CONTENT OF STORED POTATO-TUBERS

被引:167
作者
SPYCHALLA, JP [1 ]
DESBOROUGH, SL [1 ]
机构
[1] UNIV MINNESOTA, DEPT HORT SCI, ST PAUL, MN 55108 USA
关键词
D O I
10.1104/pp.94.3.1214
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 α-tocopherol were assayed from four potato cultivars stored at 3°C and 9°C for 40 weeks. Tubers stored at 3°C demonstrated increased superoxide dismutase activities (up to 72%) compared to tubers stored at 9°C. Time dependent increases in the levels of superoxide dismutase, catalase, and α-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.
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收藏
页码:1214 / 1218
页数:5
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