ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Physiological changes during postharvest senescence of broccoli.

Finger, F. L.; Endres, L.; Mosquim, P. R.; Puiatti, M.;

Pesquisa Agropecuaria Brasileira Year: 1999 Vol: 34 Issue: 9 Pages: 1565-1569 Ref: 22 ref.

1999

บทคัดย่อ

Fresh broccoli cv. Piracicaba Precoce heads were stored at 25 deg C and 96% RH in the dark until complete senescence. Inflorescences showed lack of turgidity and commercial value when weight loss reached up to 5%, which occurred 48 h after harvest. Chlorophyll content was stable until 24 h after harvest; afterwards, an intense degradation phase took place. At 72 h, total head yellowing was observed, when chlorophyll content dropped to 30% of its initial value. Peroxidase activity increased 1.4-fold during the first 6 h, dropping to its lowest level approximately 24 h after harvesting. However, from this time on, an increase in activity was observed until 72 h. At 24 h after harvesting, respiration was reduced by 50%. At later stages of senescence, respiration of florets was stable, but at a lower level than at harvest. Sharp reductions in starch and reducing sugars were observed within 24 h of harvesting, followed by continuous periods of decline.