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In order to investigate the relationships between the softening of peach fruits and cell wall hydrolases, activities of polygalacturonase, α-galactosidase, β-galactosidase, β-glucosidase, β-xylosidase, β-arabinosidase, and α-mannosidase were measured during the fruit softening of a fast softening cultvar, ´Mibaekdo´ and a slow softening cultivar, ´Yumyung´. Activities of soluble and cell wall-bound polygalacturonase were similar between two cultivars. In both cultivars, activities of soluble and cell wall-bound α-galactosidase, β-galactosidase, β-arabinosidase, and α-mannosidase were maintained high, while those of β-glucosidase and β-xylosidase were low during the softening processes. Activities of soluble α-galactosidase, β-arabinosidase, and α-mannosidase of ´Yumyung´ were higher, while activities of cell wallbound α-galactosidase and β-arabinosidase were lower than those of ´Mibaekdo´ peach throughout the softening processes. The activity of cell wall-bound α-mannosidase was similar between two cultivars. Activities of soluble and cell wall-bound β-galactosidase of a fast softening cultivar, ´Mibaekdo´ were higher than those of a slow softening cultivar, ´Yumyung´.
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