Effects of Mannitol and Sorbitol on Salt Tolerance of Buckwheat Seedlings

Salt-sensitive buckwheat(Fagopyrum esculentum Moench) variety was used as experimental material. The effects of mannitol and sorbitol on salt tolerance of buckwheat were studied through adding different concentrations of mannitol and sorbitol under NaCl stress. The results showed that the appropriate concentrations of mannitol and sorbitol treatment could obviously increase the roots vigor of buckwheat seedlings and obviously decrease the malondialdehyde(MDA) content of buckwheat leaves under NaCl stress, which could obviously increase the peroxidase(POD) and catalase(CAT) activity of buckwheat leaves. The effect of mannitol treatment was better than that of sorbitol treatment. It is indicated that the appropriate concentrations of mannitol and sorbitol treatment could obviously increase the salt tolerance of buckwheat seedlings, and the optimal concentrations of mannitol and sorbitol treatment were 0.8 mmol / L and 0.6 mmol / L, respectively.