Starch degradation and starch pattern indices; interpretation and relationship to maturity.
Brookfield, P., Murphy, P., Harker, R. and MacRae, E.
Postharvest Biology and Technology Year: 1997 Vol: 11 Issue: 1 Pages: 23-30 Ref: 26 ref.
1997
บทคัดย่อ
Fuji and Royal Gala apple fruits displayed similar patterns of starch accumulation and degradation during fruit development. Starch concentrations decreased until 30 days after anthesis, then increased, peaking at 100 days after anthesis. Starch concentrations differed between the tissue zones, being highest in the outer cortex and lowest in the core. Net starch degradation started at the same time in all tissues, well before iodine stain clearing was detected in the core, and before there was any change in background colour or increase in ethylene production. Iodine stain clearing occurred once starch concentrations fell below 2-3 mg g/fresh weight. The rate of degradation was slower in the core than in the outer cortex and other tissues in both cultivars, and in Fuji fruits the rate of degradation in the vascular bundles was also slower than in the outer cortex. The rate of starch degradation differed between the 2 cultivars, leading to an apparent difference in timing of starch degradation ac
cording to starch pattern indices. It is suggested that application of these results to fruits maturing under different conditions may lead to better interpretations of inherent fruit quality at harvest.