3.4. Effects of chitosan or oligochitosan on induction of defense-related
enzymes in pear fruit
Peroxidase and polyphenol oxidase were two kinds of redox enzymes.
The activities of PPO and POD in flesh around wound of
pear fruit were raised first and then decreased from 24 h (Fig. 4A
and B). However, compare to oligochitosan, chitosan inoculation
significantly enhanced the activities of POD and PPO in flesh
around wound of pear fruit, especially to POD (Fig. 4A and B).
Chitinase and b-1,3-glucanase are two kinds of pathogenesis-related
protein. The CHI and b-1,3-glucanase activities in flesh
around wound of control pear fruit increased with storage time,
while chitosan and oligochitosan inoculation obviously enhanced
the activities of both enzymes (Fig. 4C and D). Furthermore,
oligochitosan inoculation was more effective than chitosan, for
example, the activities of CHI and b-1,3-glucanase in oligochitosan-
treated fruit after 48 h were almost 1.5-fold to those in control
fruit.
3.4. Effects of chitosan or oligochitosan on induction of defense-relatedenzymes in pear fruitPeroxidase and polyphenol oxidase were two kinds of redox enzymes.The activities of PPO and POD in flesh around wound ofpear fruit were raised first and then decreased from 24 h (Fig. 4Aand B). However, compare to oligochitosan, chitosan inoculationsignificantly enhanced the activities of POD and PPO in flesharound wound of pear fruit, especially to POD (Fig. 4A and B).Chitinase and b-1,3-glucanase are two kinds of pathogenesis-relatedprotein. The CHI and b-1,3-glucanase activities in flesharound wound of control pear fruit increased with storage time,while chitosan and oligochitosan inoculation obviously enhancedthe activities of both enzymes (Fig. 4C and D). Furthermore,oligochitosan inoculation was more effective than chitosan, forexample, the activities of CHI and b-1,3-glucanase in oligochitosan-treated fruit after 48 h were almost 1.5-fold to those in controlfruit.
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