[Objective] The aim was to explore the effect of tomato＇s resistance to Botrytis cinerea induced by exogenous Chitosan.[Method] The leaf spraying method was used to determine the induced resistance effect of Chitosan to tomato B.cinerea and the chlorophyll content,soluble protein,soluble sugar,proline influence,the activities of peroxidase（POD）,malondialdehyde（MDA）and the Proline content in leaves of tomato.[Result] The induced resistance of Chitosan reached 58.26% at 14th d after treatment;Compared with the B.cinerea stress group,the chlorophyll content in leaves of tomato seedlings of B.cinerea stress ＋ Chitosan group had increased by 34.63%,while that of soluble protein content,soluble sugar content,Pro content and POD activity was 5.30%,10.83%,16.21% and 16.88%,respectively（except for the MDA content,which was decreased by 16.54%）.[Conclusion] Exogenous Chitosan could improve photosynthetic efficiency and protect enzymes activity to improve the resistance of tomato seedlings to B.cinerea.
[Objective] This study aimed to inveseigate the effects of chitosan on physiological characteristics of tomato seedlings under salt stress. [Method] Under salt stress of 200 mmol/L NaCI, foliar spraying induction method was used to explore the physiological role of chitosan in salt resistance of tomato seedlings with a concentration of 150 mg/L [Result] Chlorophyll content, free proline content, SOD activity and CAT activity of tomato seedlings treated with CTS ＋ salt stress increased by 26.8%, 10.7%, 10% and 58.3%, respectively, compared with that in salt stress treatment group, while MDA content had decreased by 62.5%. [Conclusion] Chitosan could delay the decline of chlorophyll content, reduce membrane lipid peroxidation, improve osmotic adjustment ability of cells, enhance the activity of protective enzyme and improve the physiological synergisms on salt resistance of tomato seedlings.
