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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。
Ultraviolet light (UV-B) is a key signaling factor in plant growth and development. Excess or lack of UV-B can affect the crop’s resistance, yield and quality. However, the UV-B intensity of cucumber growth in plant plants is not clear yet. Cucumber (Cucumis sativus L.) seedlings were used as materials to study the effects of UV-B with different intensities on the growth, physiology and antioxidant system of cucumber plants grown in indoor climate. The results showed that compared with the control, the UV-B treatment cucumber plant height decreased by 4.2% to 32.0%, leaf soluble protein content decreased by 14.2% to 28.2%. The photosynthetic rate of soluble sugar increased by 22.7% -56.7% in the leaves of 3.33μmol / (m2 · s) UV-B treated plants with the increase of 13.6% -22.3% stems, and at the same time activated the antioxidant system, superoxide dismutase (SOD) The activity of peroxidase (POD) and catalase (CAT) increased by 16.9% -23.2%, 23.8% -25.9%, 34.1% -50.4% and ascorbic acid content by 27.4% -36.4% respectively. Thus, 3.33μmol / (m2 · s) UV-B is conducive to the growth and development of cucumber seedling plants in the artificial climate chamber, antioxidant enzyme activity and antioxidant substances.