Ion Distribution in Different Organs of Alfalfa under NaCl Stress and Analysis of Salt-tolerant Mechanism

Through determining the salt ions content in different organs of different alfalfa materials under different NaCl concentration,salt ions distribution in different organs of alfalfa,the role of ions in the salt tolerance of alfalfa were studied.The salt-tolerant materials,No.1969,and salt-sensitive materials,No.0137,were used as test materials in the research.The test materials were stressed by NaCl of 0.1%,0.3%,0.5%,after 30 days the Na+,K+,Ca2+ content in the different organs were determined with ICP.With NaCl concentration increasing,Na+ content in alfalfa root,stem and leaf increased,K+ content decreased and Ca2+ concentration also decreased.Na+,K+ content and K/Na ratio in root,stem and leaf had significant differences between No.1969 and No.0137,Ca2+ content in the root and stem was no significantly different but Ca2+ content in leaf was significantly different.In the root and leaf of salt-tolerant materials,Na+ content was significantly lower than the salt-sensitive materials;K+ content,K/Na ratio in the salt-tolerant material were higher than the salt-sensitive one.