Effects of MgCl2 Stress on Alfalfa Growth and Screening of Salt Tolerance Indexes at Germination and Seedling Stages
WEI Xiaona
ZHANG Chen
QI Leping
SHEN Yingfang
Abstract：Different concentrations(0,40,80,120,160,200 mmol/L)of MgCl2 solution were set up to study the effects of MgCl2 stress on the seed germination,seedling growth and physiological indexes of alfalfa.The gray correlation analysis was used to screen the salt tolerance indexes,with the aim of providing a certain theoretical basis for the research on the response mechanism of alfalfa to MgCl2 stress and the governance of saline-alkali land.The results showed that with the increase of MgCl2 concentration and treatment time,the inhibition of alfalfa seed germination and seedling growth became more and more severe.When the MgCl2 concentration was 200 mmol/L,the seeds did not germinate and the salt damage index was 1.0.Among the germination indexes of alfalfa seeds,the fresh weight,germination rate and germination index were more closely related to salt tolerance,with correlation degrees of 0.948,0.927 and 0.927,respectively.Among the seedling growth and physiological indexes,the chlorophyll content,superoxide dismutase(SOD)activity and catalase(CAT)activity were more closely related to salt tolerance,with correlation degrees of 0.941,0.920 and 0.917,respectively.In conclusion,the main salt tolerance indexes of alfalfa are fresh weight,germination rate,germination index and chlorophyll content,SOD activity,CAT activity at germination and seedling stages,respectively.
Keywords：AlfalfaMgCl2Germination of seedsSeedling growthSalt tolerance indexes
Publication Date：2025-09-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：10( 43-52 )