Effects of Calcium on Root Activity and the Content of Osmotic Adjustable Organic Substances of Maize Seedlings Under NaCl Stress

A solution culture was conducted to study the effect of Ca2+ on the root activity and the content of osmotic adjustable organic substances of maize seedings under NaCl stress.The results showed that the root activity decreased significantly while there was a lack of Ca2+,with the increase of Ca2+ contents the root activity increased significantly,but the root activity decreased under fitting Ca2+ concentration.The lack of calcium,soluble sugar,proline and free amino acids increased significantly in leaves.With the increase of Ca2+ concentration soluble sugar,proline and free amino acids decreased gradually.In opposition to the change in leaveas,with the increase of Ca2+ concentration soluble sugar,proline and free amino acids increased gradually,proline decreased a little under 6mmol/L Ca2+ concentration in roots.With the increase of Ca2+ concentration the soluble protein in leaves increased in terms of 0-4 mmol/L of Ca2+ concentration and in that of 6 mmol/L they were decreased,while the changes in roots were not in evidence.The above results strongly suggested that the calcium participate in transportation and distribution of osmotic adjustable substances account to some extent for the mechanism of effect of Ca2+ on salt stress.