Effect of Low Concentration of Yttrium on Physiological Characteristics of Cucumber (Cucumis Sativus L.)
来源期刊：JOURNAL OF RARE EARTHS2007年增刊第1期
论文作者：Dong Zhenyu Ju Mingchao Chen Dan Wang Shuo Xie Bingning Qin Zhaojiang
Key words：rare earth elements; yttrium; physiological characteristics; promoting effects; cucumis sativus L.;
Abstract: There is no doubt that rare earth elements stand an important position among the essential elements of plant growth and it is long time since they are first used as plant growth promoters. Given their effects on microstructure, most reports are focused on the toxicology rather than promotion. Using cucumis sativus L. (Jin Chun No.5) as experiment material, we try to find out the nutritional effects of low Y3+ concentrations on cucumber seedlings' leaves. The present paper suggests that the rare earth elements act as micronutrients at low concentrations while they give rise to toxicity at high concentration. Benefits defeat toxicity with concentration ranging from 5 to 25μmol·L-1. Through careful study, at the Y (N03)3 concentration of 10μmol·L1 the content of chlorophyll as well as the activities of SOD, Cu-Zn SOD and the POD are the highest. It indicates 10μmol·L-1 is the optimum concentration of yttrium for promoting the cucumber growth.
Dong Zhenyu1，Ju Mingchao1，Chen Dan1，Wang Shuo1，Xie Bingning1，Qin Zhaojiang1
(1.Department of Chemical and Biological Science, Tianjin Normal University, Tianjin 300387, China)
Abstract:There is no doubt that rare earth elements stand an important position among the essential elements of plant growth and it is long time since they are first used as plant growth promoters. Given their effects on microstructure, most reports are focused on the toxicology rather than promotion. Using cucumis sativus L. (Jin Chun No.5) as experiment material, we try to find out the nutritional effects of low Y3+ concentrations on cucumber seedlings'' leaves. The present paper suggests that the rare earth elements act as micronutrients at low concentrations while they give rise to toxicity at high concentration. Benefits defeat toxicity with concentration ranging from 5 to 25μmol·L-1. Through careful study, at the Y (N03)3 concentration of 10μmol·L1 the content of chlorophyll as well as the activities of SOD, Cu-Zn SOD and the POD are the highest. It indicates 10μmol·L-1 is the optimum concentration of yttrium for promoting the cucumber growth.
Key words:rare earth elements; yttrium; physiological characteristics; promoting effects; cucumis sativus L.;
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