Effects of ALA on physiological characteristics of Cassia obtusifolia seedlings under salt stress

In order to get the method to improve the salt resistance of seedlings for Cassia obtusifolia under salt stress,physiological characteristics of C.obtusifolia seedlings were studied. Several physiological indexes of C.obtusifolia seedlings under salt stress like photosynthetic pigment,superoxide anion(O-2.),malondialdehyde(MDA),superoxide(SOD),peroxidase(POD) and catalase(CAT) were measured. The rate of decrease was relieved and the content of O-2.,MDA decreased. The activities of three enzymes including SOD,POD and CAT were increased by the treatment of ALA,and reached the maximin(80.0 U·g-1,196.4 U·g-1 and 114.1 U·g-1 respectively)with the concentration of 50 mg·L-1. ALA with concentration of 50 mg·L-1 could significantly alleviate the damages to the seedlings of C.obtusifolia under salt stress,and promote the salt resistance of the seedlings.