Effect of salt stress on ion absorption and distribution of two Lycium seedlings

Na+,K+,Ca2+,Mg2+,Si4+ and Cl-absorption and distribution in different organs of two Lycium seedlings(Lycium ruthenicum and L.barbarum) were studied under NaCl stress.There were higher Na+ and Cl-relative contents of two seedlings than those of contrast,and its content became gradually higher with salt concentration increasing.Among different organs,accumulation of Na+ and Cl-were the most highest in leaves tissue.On the contrary,K+,Ca2+,Mg2+ and Si4+ contents of seedlings under different salt tolerance reduced or did not vary compared with contrast.At the same time,the K+/Na+,Ca2+/Na+,Mg2+/Na+ and Si4+/Na+ ratios in leaves,stems and roots decreased gradually with salt concentration increasing under NaCl stress.The K+/Na+,Ca2+/Na+,Mg2+/Na+ and Si4+/Na+ ratios in L.ruthenicum under salt stress were markedly higher than those in L.barbarum,and the descendant degree of these ratios of L.ruthenicum were enormously lower than those of L.barbarum especially in higher salt concentration,which showed that L.ruthenicum had stronger ability than L.barbarum in salt tolerance.