Comparison of the Nitrogen Metabolism on Leaves of Two Loquat Cultivars
The nitrogen contents and the activity of metabolism related enzymes in loquat(Eriobotrya japonica Lind1.CV.Zaozhong 6 and Donghuzao)leaves were studied,and the interrelationships were also probed.The results showed that the contents of the nitrogen and the soluble protein,and the activities of the metabolism related enzymes(nitrate reductase,glutamine synthase and glutamate dehydrogenase)of loquat leaves in Spring shoots in the variety'Donghuzao'were all higher than that in the variety'Zaozhong 6';However,there were no significant differences in the leaves in Summer,Autumn and Winter shoots between the two loquat varieties.Correlation analysis showed that the contents of the total nitrogen of leaves in the two loquat varieties all had significant or extremely significant positive correlations with the activity of NR,GS and GDH in four seasons;The contents of the ammonia nitrogen of leaves in the variety'Zaozhong 6'had significant positive correlations with the activity of NR and GS,while there were no significant correlations in the variety'Donghuzao';The contents of the nitrate nitrogen of the leaves in the two loquat varieties all had no significant correlations with the activity of NR,GS and GDH.