Effects of salt stress on the growth status and physiological characteristics of three shrubby plants
[Purpose]To identify plants suitable for cultivation on coastal saline soil and provide references for the ecological resto-ration of coastal sandy land,the growth status of three shrub plants under different salt concentration stresses was explored.[Meth-od]The growth state and leaf physiological indexes of Gardenia jasminoides,Lantana camara,and Euphorbia milii were determined under root salt stress(the mass ratio of sea salt to cultivated substrate was 0.1％,0.2％,and 0.3％,respectively,using CK without any treatment as the control)and leaf salt stress(the mass ratio of sea salt to distilled water was 0.2％and 0.3％,using CK without any treatment as the control).The salt tolerance of the three experimental plants was evaluated by principal component analysis.[Result]The growth of the three tested plants was inhibited after salt stress treatment.Under root salt stress,the relative water con-tent of G.jasminoides leaves was higher than CK on day 14 after treatment with 0.2％salt.On day 28 after treatment with 0.1％and 0.2％salt,the relative water content of G.jasminoides and E.milii leaves surpassed that of CK.Under leaf salt stress,the relative wa-ter content of G.jasminoides leaves remained higher than CK on day 14 and 28 after treatment with 0.2％salt.On day 28 after treat-ment with 0.3％salt,the relative water content of the G.jasminoides leaves exceeded that of CK.Following the treatment of the root systems of the plants with 0.1％,0.2％,and 0.3％salt,the MDA content in G.jasminoides increased minimally compared to CK,with its POD and CAT activities significantly higher than CK.Following the treatment of the leaves with 0.2％and 0.3％salt,the MDA content in E.milii increased minimally compared to CK,with a significantly higher POD activity than that of CK.Following the treatment of the leaves with 0.3％salt,the CAT activity in E.milii exceeded that of CK.Principal component analysis revealed that the salt tolerance of the three experimental plants under root salt stress was ranked as follows:G.jasminoides＞L.camara＞E.milii.Un-der leaf salt stress,the order of salt tolerance was:E.milii＞G.jasminoides＞L.camara.[Conclusion]The salt tolerance of G.jasmi-noides was the strongest in the root salt stress mode,and the salt tolerance of E.milii was the strongest in the leaf salt stress mode.The results can provide a basis for planting shrubs on saline-alkali soil.
salt stressshrubberyenzyme activityprincipal component analysis
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