光质对低温胁迫下草莓叶片生理生化特性的影响

为研究不同光质对低温胁迫下草莓叶片生理生化特性的影响。以4 ℃低温胁迫下的丰香草莓苗为试材，用白光、红光、蓝光以及红蓝混合光（1∶1）处理12，24，48，72 h后取叶片进行相关生理生化指标的测定。结果表明：在低温下，白光有利于SOD，CAT，POD活性的提高，从而能够有效地清除ROS，保护草莓叶片细胞膜不被氧化，但却不利于渗透调节物质的增加。红光可以提高草莓叶片可溶性糖含量，抑制丙二醛的生成，蓝光有助于脯氨酸和可溶性蛋白含量的增加，但不利于相关抗氧化酶活性的提高和光合作用，而红蓝光具有红光和蓝光的双重效应。在生产上适当的补给红光、红蓝光有利于草莓植株抗寒性的提高。

Effects of light quality on physiological and biochemical indexes in strawberry leaves under low temperature stress

To study the effects of light quality on resistant index in strawberry leaves under low temperature stress， different light qualities including white light， red light， blue light and red and blue mixed light （1∶1） were used to irradiate strawberry seedlings under 4 ℃ for 12， 24， 48 and 72 h. The results showed that white light had an advantage of improving SOD， CAT， POD activities， which could effectively remove ROS and protect cell membranes from oxidation. Yet， white light was not conducive to increase the content of osmolytes. Red light could improve soluble sugar contents， and inhibit the production of MDA. Blue light was helpful to increase proline and soluble protein contents， but not good for the increase in antioxidant enzymes activities and maximum photosynthetic rate. Mixed light （red∶blue=1∶1） had the dual effects of red and blue light. It was concluded that adequate supplies of red， mixed light （red∶blue=1∶1） had a favor to improve resistance of strawberry to low temperature.