The rapid ability of Phomopsis to infect mangoes indicated that it
was the most virulent of the strains tested.
Fig. 1 shows different sensitivities of strains to different
coatings applied on the mangoes. The concentration of chitosan
in the coating solution and the presence of the enzyme system
affected the fungal decay of the fruit. The percentage of strain
inhibition was improved with the increase of chitosan concentration,
and it became higher when the LPOS system was added. The
inhibitory action of chitosan alone has already been demonstrated
in several studies. These studies reported that the antifungal effect
of chitosan was dependent on concentration (El Ghaouth et al.,
1992; Jiang and Li, 2001; Liu et al., 2007). Chitosan with its positive
charges interacts with negatively charged membranes of the cell to
alter cell permeability.
In all the cases, the inhibition by the coatings was improved by
the LPOS. Some strains that showed a resistance to chitosan
became more sensitive to LPOS. Phomopsis was inhibited 58% by
chitosan, 1% alone and in the presence of LPOS, the inhibition
reached about 100%. These results showed that there was a
synergistic effect of chitosan and LPOS.
Inhibitory effects increased with the incorporation of LPOS or
LPOSI in chitosan at 1 or 1.5%. The synergistic effect between the
LPOS with chitosan against C. gloeosporioides strains and L. diplodia
has already been demonstrated by Cissé et al. (2013). They revealed
that this combination was more effective with chitosan at 1 and
1.5%.
The rapid ability of Phomopsis to infect mangoes indicated that itwas the most virulent of the strains tested.Fig. 1 shows different sensitivities of strains to differentcoatings applied on the mangoes. The concentration of chitosanin the coating solution and the presence of the enzyme systemaffected the fungal decay of the fruit. The percentage of straininhibition was improved with the increase of chitosan concentration,and it became higher when the LPOS system was added. Theinhibitory action of chitosan alone has already been demonstratedin several studies. These studies reported that the antifungal effectof chitosan was dependent on concentration (El Ghaouth et al.,1992; Jiang and Li, 2001; Liu et al., 2007). Chitosan with its positivecharges interacts with negatively charged membranes of the cell toalter cell permeability.In all the cases, the inhibition by the coatings was improved bythe LPOS. Some strains that showed a resistance to chitosanbecame more sensitive to LPOS. Phomopsis was inhibited 58% bychitosan, 1% alone and in the presence of LPOS, the inhibitionreached about 100%. These results showed that there was asynergistic effect of chitosan and LPOS.Inhibitory effects increased with the incorporation of LPOS orLPOSI in chitosan at 1 or 1.5%. The synergistic effect between theLPOS with chitosan against C. gloeosporioides strains and L. diplodiahas already been demonstrated by Cissé et al. (2013). They revealedthat this combination was more effective with chitosan at 1 and1.5%.
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