Effects of Cu<sup>2+</sup> on Wheat Seedlings Exposed to Enhanced Ultraviolet-B Radiation
- 1 Shanxi Normal University, Linfen, China
- 2 Shanxi Normal University, Linfen, China
- 3 Shanxi Normal University, Linfen, China
- 4 Shanxi Normal University, Linfen, China
- 5 Biotechnology Research Centre, Shanxi Academy of Agricultural Sciences, Taiyuan, China
- 6 Key Laboratory of Crop Gene Resources and Germplasm Enhancement on Loess Plateau, Ministry of Agriculture, Taiyuan, China
Abstract
To explore the wheat seedling development and physiological responses under copper contami nation and enhanced ultraviolet-B (UV-B) irradiation, 10 mg · L -1 CuCl 2 solution was irrigated to Triticum aestivum L. cv. Linyuan 2069 one day after germination with or without ultraviolet-B (10.08 kJ m -2 ·d -1 ) light exposure, respectively. The results showed that Cu 2+ and UV-B caused var ious adverse effects on wheat seedling development. Cu 2+ hindered root development by significantly reducing root number, while UV-B dwarfed seedling height and decreased the leaf length. Chlorophyll content and activity of ATPase in thylakoid membrane of wheat leaves dropped significantly under enhanced UV-B while the activity of ATPase in plasma membrane of seedling root was significantly decreased in Cu 2+ group. Relative electric conductivity of leaves significantly increased in both Cu 2+ and UV-B groups, so did the biomass. We also observed that combined Cu 2+ and UV-B showed more adverse effects on wheat seedlings than either of them alone except for root growth.
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