Effect Of Chitosan On Inducing The Heat-tolerance Of Vegetable And Its Possible Physiological Mechanism

Effect of chitosan on inducing the heat-tolerance of cucumber (Cucumis sativus L.) and Spinach(Spinach oleracea L.) were used to study in order to discover their possible physiological mechanism. The result are as follow:1. The seeds of cucumber were germinated and grew at the different concentration chitosan of Omg/kg, 20 mg/kg, 50mg/kg, 100mg/kg and 200mg/kg respectively, under 25℃,95% RH . The results showed the hypocotyls of cucumber were promoted at lower concentration and inhibited at the high concentration of chitosan. The hypocotyls grew fast at the concentration of 50mg/kg, but inhibited in 100mg/kg and 200mg/kg. The growth of plumules is different. They increased more fast in chitoan, especially in 50mg/kg, and the root hair grew more and healthier than control.The experiment is adopted hydroponic determinetion to study chitosan effect of root. It was found the root of cucumber grew better in 20mg/kg, but it was inhibited in 100mg/kg and 200mg/kg. After cultivated in chitosan for 14 days , the height and dry weight is the same as below.2. Effect of chitosan induncing antioxidant system on cucumber was studied. The cucumber seedlings in three leaf were treated by chitosan with 0mg/kg , 50mg/kg , 75mg/kg and 100mg/kg,...