Effect Of "Ji-Duo-Chan" On The Growth Of Cucumber Seedling Under High Temperature And Salt Stress

The paper investigated the effects of "Ji-Duo-Chan"(the acid solution of chitosan)on Characters of growth and development and changes of physiologic and biochemical characters of the cucumber seedling which under hight temperature and salt stress. In the test ,it mensurate and analyse the Characters of growth and development, Antioxidant enzyme SOD,dissoluble albumen and MDA in order to discover the possible physiological of "Ji-Duo-Chan" alleviate effects. The result are as follow:1. The cucumber seedling in three or four leaves were planted in 0, 25, 50,100mmol/L of NaCl solution.In the same time, put this treated cucumber seedling in 40/30℃with 2 hours, 3 hours, 4 hours.It was found that the Characters of growth and development, the activities of Antioxidant enzyme SOD, the content of dissoluble albumen and MDA of the cucumber seedling which under 2 hours of hight temperature stress became descended the three days after hight temperature stress. However, the cucumber seedling which under 3 hours and 4 hours of hight temperature stress changed 5 hours and l-3hours after hight temperature stress.2. The cucumber seedling in three leaves were planted in 0 , 25 , 50 ,100 mmol/L of NaCl solution,and were treated in normal temperature, 30℃, 35℃,40℃.In the same time,this cucumber seedling were sprayed by "Ji-Duo-Chan" of 0 , 50 , 100 and 150mg/L once a day for 10 days. The result was showed:(1) In the tallness of plant, the compages of Liu Liang 1 , 30℃, 50 mmol/L of NaCl solution,100 ml/L of "Ji-Duo-Chan" solution is batter. In the area of leaves, the compages of Jin Yan 4 , 35℃, 50 mmol/L of NaCl solution,50 ml/L of "Ji-Duo-Chan" solution is batter. In the ratio of root and plant, the compages of Jin Yan 4 , 25℃, 100 mmol/L of NaCl solution,50 ml/L of "Ji-Duo-Chan" solution is batter. In the dry weight of plant, the compages of Liu Liang 1 , 35℃, 0 mmol/L of NaCl solution, 100 ml/L of "Ji-Duo-Chan" solution is batter. (2) In the activities of Antioxidant enzyme SOD, the compages of Jin Yan 4 , 35℃, 50 mmol/L of NaCl solution,50 ml/L of "Ji-Duo-Chan" solution is batter.(3) In the content of dissoluble albumen , the compages of Jin Yan 4 , 35℃, 50 mmol/L of NaCl solution, 100 ml/L of "Ji-Duo-Chan" solution is batter. (4) In the content of MDA of the cucumber seedling, the compages of Jin Yan 4 , 35°C , 50 or 100 mmol/L of NaCl solution, 100 ml/L of "Ji-Duo-Chan" solution is batter.