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- Title
Molecular weight‐dependent antifungal activity and action mode of chitosan against Fulvia fulva(cooke) ciffrri.
- Authors
Meiqin Li; Xiguang Chen; Jianmin Liu; Weifen Zhang; Xuexi Tang
- Abstract
Antifungal activities of chitosans (CTS) with different molecular weights (Mw) and different concentrations against Fulvia fulva(cooke) ciffrri (F. fulva) causing leaf mold in tomato plants were studied in vitroand in vivo; the action mode and its inhibition at different stages during the life cycle of F. fulvawere observed. The results showed that: (1) in vitro, CTS exhibited strong antifungal activity against F. fulva, especially for the medium Mw(213 and 499 KDa) CTS. Almost complete inhibition of F. fulvaconidia germination and mycelia colony radial growth was found when CTS was at concentration of 0.5 and 2 mg mL−1, respectively; however, inhibitory effect on sporulation was not very obvious for all CTSs tested in this experiment. In vivo, CTS of 213 KDa CTS at 6 mg mL−1concentration produced stronger antifungal effect than others. (2) The morphological study by scanning electron microscope (SEM) showed that CTS could induce the hyphal swelling, and the surface of hypha which was treated with low Mw(82 KDa) chitosan was smooth, but was rough treated with high Mw(1320 KDa) chitosan. The further study using a confocal laser scanning microscopy (CLSM) coupled with fluorescein isothiocyanate (FITC)‐fluorescence detection system showed fluorescence of the FITC‐labeled chitosans of which Mws were below 500 KDa could enter into the inner of hypha; however, 1320 KDa chitosan was blocked off the outer of hypha. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
- Subjects
ANTIFUNGAL agents; CHITOSAN; MOLECULAR weights; TOMATOES; PLANT morphology
- Publication
Journal of Applied Polymer Science, 2011, Vol 119, Issue 6, p3127
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.31831