红蓝LED光源对生菜生长和品质的影响

Effect of red and blue LED light on growth and quality of lettuce

以两种紫红色和一种绿色生菜品种为材料,利用红蓝LED光源(4∶1)对3种不同类型的生菜进行处理,研究了红蓝LED光源(4∶1)对不同类型生菜生长及营养品质的影响.结果表明:红蓝LED光源处理后的生菜地上部和地下部鲜重均显著增加,地上部鲜重比对照的地上部鲜重增加了13.8%,地下部鲜重比对照地下部鲜重增加了25.6%;叶绿素含量最高提高了88.3%;同时红蓝LED光源处理后显著提高了生菜叶片中花青素和可溶性糖含量,可溶性糖含量最高比对照中增加了14.6倍,两种紫红色生菜品种花青素含量平均比对照中提高了5.8倍,有效提高了生菜的品质.同时,长时间红蓝LED处理后的生菜体内可溶性和总草酸含量没有显著改变,但硝态氮含量显著升高.

In this study,two purple and one green lettuce( Lactuca sativa L.) varieties were used to investigate the effects of red/blue( 4 ∶ 1) LED light treatments on growth and quality of lettuce by natural light as control( CK). The results showed that red/blue( 4 ∶ 1) LED light treatments displayed an positive influence on root and seeding fresh weigh of three varieties of lettuce;The fresh weight of aerial part was 13. 8% higher than that of the control. And the fresh weight of the underground part increased by 25. 6%; while the chlorophyll content increased by 88. 3%. Compared with the control,the red and blue light combination significantly improved the content of anthocyanin and soluble sugar in leaf of lettuce,the leaf content of soluble sugar increased 14. 6 times compared with control,and the average anthocyanin content of two purple varieties lettuce was 5. 8 times higher than that in the control,which improved the quality of lettuce effectively. Meanwhile,the amount of soluble and total oxalic acid content in lettuce was not significantly changed after the long period red and blue LED,but significantly increased the nitrate content.