The Effects of Different Physiological Diseases of Navel Orange on Mineral Element Contents and Nutrient Metabolism in Leaves

Contents of mineral elements in physiological diseased leaves of newhall navel orange were comparatively analyzed,then the effect of element deficiency on the concentrations of soluble sugar,protein and amino acids in the diseased leaves were studied.The results indicated that concentrations of K in the leaves of disease No.1,concentrations of Mg and Mn in the leaves of disease No.2,concentrations of Zn and Mg in the leaves of disease No.3,and concentrations of mineral element Mn in the leaves of disease No.4 were lower than those of normal leaves.The contents of soluble sugar,protein and amino acids in four kinds of physiological diseased leaves decreased obviously in compared to the normal leaves.Therefore,element deficiency can affect the nutrient metabolism of navel orange leaves.Among the four elements,K deficiency would reduce the leaf content of soluble sugar most significantly,while Zn deficiency reduce the leaf concentrations of soluble protein together with amino acids most abviously.