Antibacterial activity of two chitosan solutions and their effect on rice bacterial leaf blight and leaf streak
Version of Record online: 5 NOV 2012
Copyright © 2012 Society of Chemical Industry
Pest Management Science
Volume 69, Issue 2, pages 312–320, February 2013
How to Cite
Li, B., Liu, B., Shan, C., Ibrahim, M., Lou, Y., Wang, Y., Xie, G., Li, H.-y. and Sun, G. (2013), Antibacterial activity of two chitosan solutions and their effect on rice bacterial leaf blight and leaf streak. Pest. Manag. Sci., 69: 312–320. doi: 10.1002/ps.3399
- Issue online: 23 JAN 2013
- Version of Record online: 5 NOV 2012
- Accepted manuscript online: 3 AUG 2012 03:14AM EST
- Manuscript Accepted: 3 AUG 2012
- Manuscript Revised: 22 SEP 2011
- Manuscript Received: 19 JUN 2011
BACKGROUND: Bacterial leaf blight and leaf streak are the two most damaging bacterial diseases of rice. However, few bactericidal chemicals are available for controlling both diseases. The antibacterial properties of two kinds of chitosan with different molecular weights and degrees of N-deacetylation and their effect on rice bacterial leaf blight and leaf streak were evaluated.
RESULTS: Results showed that the two kinds of chitosan solution possess a strong antibacterial activity against both rice bacterial pathogens and significantly reduced disease incidence and severity by comparison with the control under greenhouse conditions. However, the interaction between chitosan and rice pathogens was affected by the type and concentration of chitosan, the bacterial species and the contact time between chitosan and bacteria. The direct antibacterial activity of chitosan may be attributed to both membrane lysis and the destruction of biofilm. In addition, both chitosan solutions significantly increased the activities of phenylalanine ammonia lyase, peroxidase and polyphenol oxidase in rice seedlings following inoculation of two rice pathogens by comparison with the control.
CONCLUSION: The role of chitosan in protection of rice against bacterial pathogens has been shown to involve direct antibacterial activity and indirect induced resistance. Copyright © 2012 Society of Chemical Industry