Effects of calcium on mineral element contents in different parts of Atago and Kisui pear cultivars' seedlings

Experiment was conducted with 1-year-old sand cultured trees of Atago and Kisui pear cultivars for studying the difference in content of Ca,K,Mg,Fe and Zn in different plant parts(leaf,stem of scion,rootstock and root)under treatments with 0,16,80,and 200 mg.L-1 of Ca2+.The results showed that Ca contents in leaves of Atago and Kisui were both higher than those of other parts.The K content in different parts of both cultivars in order from highest to lowest was leaf,stem of scion,root and rootstock;and the K content in leaf of both cultivars was relatively low under 200 mg.L-1 Ca treatment.The Mg con-tent in leaves,stems of scion,rootstocks and roots of both cultivars were decreased with the increase of Ca content,no signifi-cant difference was found on leaf content of Mg between the two cultivars,while under 0,16 mg.L-1 Ca treatments,the Mg contents were significantly higher in stems of scion,rootstocks and roots of Kisui.The contents of Fe in roots in both cultivars were the highest among different parts,and Fe concentration was significantly higher in roots in Atago cultivar.However,the Zn concentration was significantly higher in roots from Kisui,and Zn in leaves and stems of scion from Atago were relatively higher.Thus,all the results indicated that the Ca stress could obviously affect the content and distribution of Ca,K,Mg,Fe,Zn in different parts of pear trees.