UV-B对人工气候室内黄瓜苗期生长、生理及抗氧化系统的影响

紫外线(UV-B)是植物生长发育的关键信号因子.过量或缺少UV-B都会影响作物的抗性、产量和品质.然而,目前植物工厂中适宜黄瓜生长的UV-B强度尚不明确.以黄瓜(Cucumis sativus L.)苗期植株为材料,研究不同强度UV-B对人工气候室内黄瓜苗期植株生长、生理和抗氧化系统的影响.结果表明:与对照相比,UV-B处理黄瓜植株高度降低4.2%~32.0%,叶片中可溶性蛋白含量降低14.2%~28.2%.3.33μmol/(m2·s)UV-B处理植株茎粗增加13.6%~22.3%,叶片中可溶性糖的含量增加22.7%~56.7%,同时激活抗氧化系统,超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)活性分别提高16.9%~23.2%,23.8%~25.9%,34.1%~50.4%,抗坏血酸含量增加27.4%~36.4%.由此可知,3.33μmol/(m2·s)UV-B有利于人工气候室中黄瓜苗期植株的生长发育、抗氧化酶活性提高及抗氧化物质生成.

Effect of UV-B radiation treatments on growth, physiology and antioxidant systems of cucumber seedlings in artificial climate chamber

Ultraviolet radiation (UV-B) radiation is a key environmental signal for plant growth and development. An excess or lack of UV-B can affect plant resistance, yield and quality. However, the appropriate dose of UV-B for cucumber seedlings growth in plant factories is not well understood. In this study, the effect of different doses of UV-B radiation on the growth, physiology and antioxidant systems of cucumber seedlings in an artificial climate chamber was studied. The results showed that UV-B radiation effectively inhibited the elongation of cucumber seedlings by 4.2%-32.0% and decreased soluble protein content in cucumber leaves by 14.2%-28.2%. 3.33 μmol/(m2·s) UV-B promoted stem diameter growth, soluble sugar content, total ascorbic acid and the superoxide dismutase, peroxidase and catalase activities in cucumber leaves by 13.6%-22.3%, 22.7%-56.7%, 16.9%-23.2%, 23.8%-25.9%, 34.1%-50.4% and 27.4%-36.4%, respectively. However, this UV-B dose had no influence on the net photosynthetic rate of cucumber leaves. Therefore, we conclude that 3.33 μmol/(m2·s) UV-B is beneficial for growth and increases the resistance of cucumber seedlings in an artificial climate chamber. This study is hoped to provides a theoretical basis for cucumber and other seedling growth under UV-B treatments.