铝对茶树等植物超氧化物歧化酶的影响

Effect of Aluminium Stress on Superoxide Dismutase in Tea and Other Plants

研究了不同物种耐铝力差异与超氧化物歧化酶（ＳＯＤ）活力的关系。结果表明，在非胁迫条件下，随着大麦、小麦种子初生根的伸长，ＳＯＤ活力逐渐下降；不同物种原初ＳＯＤ活力高低与其耐铝力相一致，即茶＞小麦＞大麦。在Ａｌ处理６～１８ｈ内，ＳＯＤ活力在Ａｌ＜０．２ｍｍｏｌ／Ｌ浓度范围内呈先升后降趋势。同功酶电泳结果表明，茶树根系ＳＯＤ比大麦和小麦多两条迁移率（Ｒｆ）小的同功酶谱带。

Relationship between the Al tolerant ability and the activity of superoxide dismutase (SOD)in various plants was investigated.The SOD activity decreased with the increasing of the initial roots of barley and wheat seeds.The initial SOD activities in roots of various plants were positively correlated with their Al tolerant abilities, and the SOD activities of the plants investigated sequenced as tea>wheat>barley.During the first 18 h of Al treatment, the induced SOD activity increased with the increasing of Al level when the Al concentration was at 0.05 mmol/L or below, but decreased as the Al level further increased.Electropherosis showed that the SOD in tea roots possessed 2 more bands of small RF than those in wheat and barley.