Effects of salicylic acid on resistance to cold stress of rice seedlings

The seedlings of rice at one leave stage were treated with 0,1.0,1.5,2.0,2.5,3.0,3.5 mmol/L of salicylic acid(SA).The effects of salicylic acid on resistance of rice seedlings to cold stress were studied.The results showed that salicylic acid could enhance the resistance of rice to cold stress and the concentration of salicylic acid at 1.5 mmol/L showed the most effective.The salicylic acid increased the content of protine and chlorophyll as well as the activity of SOD,while the malodiadehyde content decreased in the leave of treated plants.However,the effects of salicylic acid on resistance to cold stress of rice seedlings showed the characters low to promote and high to suppress .