Effects of salt stress on the growth and physiological characteristics of american black walnut seedlings
[Objective]Study the growth and physiological changes of American black walnut under salt stress and a comprehensive analysis of the salt tolerance of different seedlings,with a view to providing a refer-ence for the selection and breeding of salt-tolerant varieties of black walnut,salt resistance mechanisms and the screening of salt-tolerant rootstocks in Xinjiang walnut growing areas.[Methods]The growth and physio-logical responses of seedlings of small-fruited black walnut(Juglans regia.microcarpa),northern California black walnut(Juglans regia.hindsii),eastern black walnut(Juglans regia.nigra)and quebracho black walnut(Juglans regia.major)were analyzed by correlation analysis and subordinate function analysisgrowth and physi-ological responses of above-ground dry weight,below-ground dry weight,main root length,lateral root number and MDA content of the four black walnut seedlings were analyzed.[Results]After 40 d of salt stress,above-ground dry weight,below-ground dry weight,main root length and number of lateral roots all de-creased to different degrees,with different magnitudes of change for different materials;with increasing salt concentration,malondialdehyde content increased,and SOD activity,POD activity,proline content and solu-ble sugar content generally showed a trend of first increasing and then decreasing.[Conclusion]A compre-hensive analysis of the affiliation function values yielded four species of black walnuts in descending order of salt tolerance:eastern black walnut>small-fruited black walnut>quebracho black walnut>northern Cal-ifornia black walnut.
black walnutsalt stressgrowth physiologycomprehensive evaluation
万方数据
维普
