期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：199
期号：4
页码：042006
DOI：10.1088/1755-1315/199/4/042006
语种：English
出版社：IOP Publishing
摘要：To study the effects of exogenous melatonin on the repair of fruit tree seedlings under heavy metal stress, Zizyphus acidojujuba seedlings were treated with different concentrations of exogenous melatonin (0, 50, 100, 150, and 200 μmol L–1) by root-irrigation under cadmium (Cd) stress (5 mg kg–1) by a pot experiment. The results showed that compared with the control (0 μmol L–1), root-irrigation with exogenous melatonin reduced the leaves biomass and photosynthetic pigment content of the Z. acidojujuba seedlings, and also reduced the SOD, POD activity and soluble protein content. In addition to 50 μmol L–1 exogenous melatonin reduced the Cd content in roots of Z. acidojujuba seedlings, the other treatments increased the Cd content in the roots and leaves of Z. acidojujuba seedlings under irrigated exogenous melatonin, and exogenous melatonin also promoted the transport of Cd from the roots of Z. acidojujuba seedlings to the shoots, with all the maximum appeared at 200 μmol L–1. Therefore, under the conditions of Cd pollution, exogenous melatonin inhibited the growth and increased the Cd content of Z. acidojujuba seedlings. As the concentration of exogenous melatonin increased, the inhibitory intensity and increased amount was also increased.
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