Effects of NaCl stress and exogenous plant hormones on seed germination and seedling growth of Galega orientalis

In order to determine the concentration of salt tolerance standard and confirm effects of different plant growth hormones on seed germination and seedling physiological characteristics, the seeds of Galega orientalis were germinated at different concentration of NaCl solutions, and then germination rate, seedling praline, MDA and chlorophyll contents were compared. The results showed that G.orientalis seed germination and seedling growth were sensitive to salinity. The seeds can endure NaCl stress under 50 mmolL-1. The lower NaCl concentration did not significantly affect the seed germination and seedling growth. However, with the NaCl concentration increasing, the germination rate，MDA and chlorophyll contents of G. orientalis seedlings decreased and the proline content significantly (P0.05) increased. The results also indicated that GA3 was suitable for increasing the seed germination of G. orientalis when the salt concentration was below 150 mmolL-1 and NAA was available to regulate the seedling growth under middle or low salt stress levels.