Effects of ABA on the content of mineral element and proline of two alfalfa varieties under NaCl stress condition

In the hydroponics conditions, we studied the mineral elements and proline contents of two alfalfa varieties under different exogenous abscisic acid (ABA) concentrations and 150 mmol/LNaCl. The results showed that the dry matters weight of different plant organs decreased significantly in NaCl tolerance. However, proline content accumulated seriously, which appeared differently in organs: leaf ＞shoot＞root. Moreover, accumulations of proline were more significant under the treatment of NaCl+ ABA.And the contents of Victoria were higher than Zhongmu No.1.Compared with the NaCl treatment, the added ABA significantly decreased Na contents and Mg contents, but notably increased K contents and Mg contents.But when the concentration of abscisic acid was 10 mol/L, the effect was more better.