Abstract
Aspergillus rot on apple fruit induced by inoculation with a spore suspension of Aspergillus niger was investigated in relation to watercore severity. The brown areas of Aspergillus rot in the fruit with watercore symptoms were less severe than in fruit without watercore, and the brown areas in the infected flesh were remarkably soft. The softening of flesh tissue with watercore by enzymes produced by A. niger was retarded compared with that in tissue without watercore. Flesh tissue with watercore had higher sorbitol concentrations than tissue without watercore. Sorbitol retarded the softening of flesh tissue by the enzymes produced by A. niger, and galactosidase and pectinesterase (PE) activities were retarded by sorbitol. We conclude that elevated sorbitol concentrations in tissue with watercore might inhibit A. niger infection.
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