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Preliminary Discussion on Physiological Characteristics of Salt Resistance of Xanthoceras sorbifolia Bunge and Leucaena bentham

LIU Yu-dong et al(Department of Horticulture,Tianjin Agricultural University,Tianjin 300200)  
[Objective] The aim was to compare the physiological characteristics of salt resistance between Xanthoceras sorbifolia and Leucaena.[Method] With the X.sorbifolia and Leucaena as the tested materials,the changes of the cell membrane permeability,the proline content and the malondialdehyde content in the 2 kinds of plants were compared under the treatments of different concn.of salt stress.[Result] When the salt was less than 0.2%,the cell membrane permeability of the Leucaena was higher than that of X.sorbifolia and when the salt was more than 0.2%,the cell membrane permeability of the X.sorbifolia was higher than that of Leucaena.When the salt was less than 0.1%,the proline accumulation in X.sorbifolia and Leucaena had little difference,but when the salt was more than 0.1%,the proline content of Leucaena was increased obviously,which was far higher than that of the X.sorbifolia.The malondialdehyde content of the X.sorbifolia and Leucaena all showed increasing trend with the increment of the salt concn.,but the malondialdehyde content of the Leucaena was always higher than that of X.sorbifolia.[Conclusion] The membership function analysis showed that the average value of membership function of Leucaena was high and its salt resistance was stronger than that of X.sorbifolia when the salt was 0.2% and 0.3%.
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