Effects of Salt Stress on Main Osmotic Adjustment Substance in Root and Shoot of Maize

In order to reveal the physiological adapting mechanism to salt stress in different organs of maize seedling,germinating maize seeds were treated by various concentrations of NaCl solution to determine the changes of main osmotic adjustment substance content in roots and buds.The results indicated that when compared with control(0 mmol/L NaCl),the free proline and total soluble sugar content of maize roots significantly increased by 205.11% and 25.00% respectively(increase amplitudes of buds were 2.96% and 10.53% respectively) under the treatment of 100 mmol/L NaCl solution stress,but no significant changes were found in soluble protein content under this treatment.Under the treatment of 200 mmol/L NaCl solution stress,although the increase amplitudes of free proline and soluble protein content of maize buds(94.84%,29.17%) were slightly larger than those of maize roots(90.32%,23.33%),no significant changes in buds and significant increase in roots(increase amplitude was 58.33%) were found respectively in soluble sugar content under this treatment.The above experimental results could in-depth prove that under treatments of NaCl solution stress,the osmotic adjustment ability of organic substance of maize roots was greater than that of maize buds obviously.