3. Results
3.1. Effects of chitosan or oligochitosan on spore germination and germ
tube elongation
As shown in Fig. 1, spore germination and germ tube elongation
of A. kikuchiana and P. piricola were significantly inhibited by chitosan
or oligochitosan with concentration-dependent mode (P < 0.05).
Both chitosan and oligochitosan at 5.0 g/L inhibited completely
spore germination of the two fungi after 6 h inoculation. The IC50
of chitosan on the spore germination of A. kikuchiana and P. piricola
was 1.85 and 1.81 g/L, respectively (Table 1). Correspondingly, the
IC50 of oligochitosan was 1.51 and 1.61 g/L. Thus, compare to
chitosan, oligochitosan was more effective on inhibition spore
germination.