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Role of glycosidases in the softening of apricots during postharvest ripening.

Cardarelli, M. T.; Botondi, R.; Mencarelli, F.;

Italus Hortus Year: 1998 Vol: 5 Issue: 5/6 Pages: 27-31 Ref: 26 ref.

1998

บทคัดย่อ

Role of glycosidases in the softening of apricots during postharvest ripening.

Apricots, cv. Boccuccia spinosa, picked at an average penetrometer reading of 62.6 N and soluble solids content (SSC) of 12.6 were kept in air at 18 deg C and 85% RH. Physiological and quality measurements were taken at pre-ripe stages 0 and 1 (PR1 and PR2), ripe stages 3, 5 and 7 (R1, R2 and R3) and the overripe stage at 10 days (OR). In the first day, a burst of ethylene production and respiration was observed in relation to significant weight loss (1.1%). A second, greater ethylene peak was observed at R3. A good edible quality was achieved at day 5, when SSC was approximately 14% and acidity was between 1.1-1.2%. Firmness decreased from 62.6 to 24.8 N during the first day, as measured by penetrometer, but non-destructive tests displayed a progressive increase in fruit deformations with time. alpha -L-Arabinofuranosidase, alpha -D-galactosidase, alpha -D-mannosidase and beta -D-galactosidase had activities 10 times greater than other glycosidases. alpha -L-Arabinofuranosidase, alpha -D-galact

osidase and alpha -D-mannosidase activities began to increase at the PR2 stage. The parallel loss of firmness and increase in the activity of some glycosidases, indicates the involvement of glycosidases in apricot softening.