Abstract:To investigate the effect of salt stress on growth and ion distribution of Brachypodium distachyon (Bd21),we treated Bd21 seedlings with various concentration of NaCl,while the Arabidopsis thaliana seedlings were used as control.The results showed that:(1)The growth of roots and leaves of Bd21 was markedly inhibited under salt treatments.(2)Based on the results of root/leaf ratio,root growth of the Bd21 was better than that of Arabidopsis seedlings under the same salt treatments,suggesting that Bd21 is more tolerant to salt stress compared to the Arabidopsis seedlings.(3)Leaf Na+ content was lower than that in roots,and the K+,Cl-,and the ratio of K+/Na+ in leaves were higher than those in roots under salt treatments,indicating that the transport of Na+ from the root to the shoot is effectively inhibited in Bd21.(4)Positive correlations of Na+ and K+ content were found in Bd21 and Arabidopsis roots,however,no correlations were found in leaves.These results implied that the same transporters are used to transport the Na+ and K+ in both plant roots and different channels are needed in leaves.