桑树蛋白质含量与硝酸还原酶活性关系的初步研究

Nitrate is reduced to ammonia by nitrate reductase and nitrite reductase and take part in protein synthesis of mulberry. In order to illustrate the role of the nitrate reductase in protein synthesis of mulberry, Nitrate reductase activity and content of protein were measured from the different varieties, different leaf position, and hybrid system. The experimental results showed that protein content of "Masang" was the highest among the variety measured and nitrate reductase activity of " Zhuyeqinghas" was the highest; There was a significant difference in protein content of different leaf position ,tender leaves < old leaves < mature leaves, but nitrate reductase activity was different in different variety. For "Husang 32" the activity of nitrate reductase was old leave 〉 tender leave〉mature leave ; For "Jialing40" , the activity of nitrate reductase was mature leave 〉 tender leave〉old leave . For Hybrid strains of mulberry, nitrate reductase activity of F1 was higher than parents but its protein content was lower than parents. To sum up, nitrate reductase in leaves and protein content in mulberry leaves in the absence of positive correlation.