Structural Characterization of Oligochitosan Elicitor from Fusarium sambucinum and its Elicitation of Defensive Responses in Zanthoxylum bungeanum

Li, Peiqin
Linhardt, Robert J.
Cao, Zhimin
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Biology , Chemistry and chemical biology , Chemical and biological engineering , Biomedical engineering
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Structural Characterization of Oligochitosan Elicitor from Fusarium sambucinum and its Elicitation of Defensive Responses in Zanthoxylum bungeanum, P. Li, R. J. Linhardt, Z. Cao International Journal of Molecular Sciences, 17, 2076, 2016.
Oligosaccharide elicitors from pathogens have been shown to play major roles in host plant defense responses involving plant-pathogen chemoperception and interaction. In the present study, chitosan and oligochitosan were prepared from pathogen Fusarium sambucinum, and their effects on infection of Zanthoxylum bungeanum stems were investigated. Results showed that oligochitosan inhibited the infection of the pathogen, and that the oligochitosan fraction with a degree of polymerization (DP) between 5 and 6 showed the optimal effect. Oligochitosan DP5 was purified from fraction DP5-6 and was structurally characterized using electrospray ionization mass spectrometry, Fourier transform infrared spectroscopy, and nuclear magnetic resonance spectroscopy. Oligochitosan DP5 showed significant inhibition against the infection of the pathogenic fungi on host plant stems. An investigation of the mechanism underlying this effect showed that oligochitosan DP5 increased the activities of defensive enzymes and accumulation of phenolics in host Z. bungeanum. These results suggest that oligochitosan from pathogenic fungi can mediate the infection of host plants with a pathogen by acting as an elicitor that triggers the defense system of a plant. This information will be valuable for further exploration of the interactions between the pathogen F. sambucinum and host plant Z. bungeanum.
International Journal of Molecular Sciences, 17, 2076
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The Linhardt Research Labs.
The Shirley Ann Jackson, Ph.D. Center for Biotechnology and Interdisciplinary Studies (CBIS)
Multidisciplinary Digital Publishing Institute (MDPI)
The Linhardt Research Labs Online Collection
Rensselaer Polytechnic Institute, Troy, NY
International Journal of Molecular Sciences
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