不同光质下栽培人参硝酸还原酶(NR)活性和蛋白质含量的变化

人参叶片和根部硝酸还原酶(NR)活性在花前期最高,以后逐渐下降,叶片的NR活性显著高于根中;人参叶片中可溶性蛋白和总蛋白氮含量在花前期最高,以后随着生育期进程而下降,但根部的却随着生育进程而增加到成熟期的最高值.单光质膜下生长的人参叶和根的NR活性,可溶性蛋白和总蛋白氮含量均以蓝光膜下最高,红光、绿光膜下的较低,在红光膜或红、绿组合先膜中增加蓝光成份可提高NR活性及蛋白含量.结果表明:在人参栽培中,增加蓝光成份有利于氮代谢.

THE CHANGES OF NITRATE REDUCTASE (NR) ACTIVITY AND PROTEIN CONTENT OF CHINESE PANAX GINSENG LEAVES AND ROOTS CULTIVATED UNDER DIFFERENT LIGHT QUALITIES

The effects of light qualities on the Nitrate Reductase (NR) activity and protein content of Chinese Panax ginseng were investigated. The results are as follow:The NR activity in leaves and roots was the highest at preblossom stage and declined as the roots matured and the leaves senesced. The NR activity in leaves was higher than that in roots. The soluble protein and the total protein nitrogen contents in leaves were reduced from the highest value at preblossom stage to the lowest at maturation stage, while that in roots were quite the reverse.The NR activity, soluble protein and total protein nitrogen contents in the leaves and roots cultivated were the highest under blue light membrane; and relatively lower under red or green light membranes. It is possible to increase NR activity and soluble protein content in leaves and roots by increasing the blue light component in red or red-green light membranes.The above results showed that in Ginseng cultivation increase of blue light is beneficial to the nitrogen metabolism.