LED光质对竹柏幼苗生长和光合作用的影响

Effect of LED lights quality on the growth and photosynthesis of Nageia nagi seedlings

[目的]探索竹柏幼苗光合作用特性及补光培育技术。[方法]基于LED光源,研究红光、蓝光、白光对竹柏幼苗生长及光合作用产物、特性的影响。[结果](1)白光处理下竹柏的生长效果较差,株高、地径、叶片指标均低于红光和蓝光;(2)蓝光处理下竹柏叶片的叶绿素a/b、净光合速率最大,可溶性蛋白含量最高,叶片具有阳生植物的特性,其中叶绿素a/b和可溶性蛋白含量分别比白光处理高17.51%和24.37%,净光合速率比红光处理高823.08%;(3)红光处理下竹柏地径、株高、叶片数量、叶面积增长量及叶片可溶性糖含量最大,其中地径、株高、叶片数量、可溶性糖含量分别比白光处理高326.67%、92.75%、100.00%、111.03%,叶面积增长量比蓝光处理高214.29%。[结论]综合比较竹柏幼苗的生长指标和光合作用效果,红光最有利于竹柏的生长。

[Purpose]To explore the photosynthetic characteristics and light-supplementation cultivation technology of Nageia nagi seedlings.[Method]Based on LED(light emitting diodes)light source,the effects of red,blue,and white light on seedling growth,photosynthetic products and characteristics of N.nagi seedlings were studied.[Result](1)The growth effect under white light was relatively poor,resulting in lower plant height,ground diameter,and leaf index than those under red and blue light.(2)Under blue light,the leaf chlorophyll a/b ratio and net photosynthetic rate were the largest,the soluble protein content of the seedlings were the highest,and the leaves had the characteristics of plants under sunlight.The chlorophyll a/b ratio and soluble protein contents were 17.51%and 24.37% higher than those under white light,respectively,and the net photosynthetic rate was 823.08% higher than that under red light.(3)Increments of the ground diameter,plant height,number of leaves and leaf area,and soluble sugar content of the seedlings were the highest under red light.The ground diameter,plant height,number of leaves,and soluble sugar content were 326.67%,92.75%,100.00%,111.03% higher than those under white light,respectively.There also was 214.29% more leaf area than that under blue light.[Conclusion]Through the comparison of growth index and photosynthetic effect,the red light is most favorable to the growth of N.nagi seedlings.