บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of floret maturity, cytokinin and ethylene on broccoli yellowing after harvest

M. S. Tian, L. Davies, C. G. Downs, X. F. Liu and R. E. Lill

Postharvest Biology and Technology Vol: 6 Issue: 1-2 Pages: 29-40

1995

บทคัดย่อ

Effects of floret maturity, cytokinin and ethylene on broccoli yellowing after harvest

The phytohormones ethylene and cytokinin have a central role in the postharvest yellowing of broccoli. The relationship between ethylene synthesis and the extent of yellowing was examined in three broccoli cultivars (`Shogun', `Green Belt' and `Green Beauty'). In these cultivars, no consistent relationship was found between basal ethylene production and the rate of floret degreening (20°C in darkness). In cultivar `Shogun', floret maturity stages were determined by examining the developmental stages of the pollen. Different patterns of ethylene production, ethylene sensitivity, respiratory activity and chlorophyll loss occurred in florets of different maturities. Floret maturity is likely to have the greatest effect on the rate of broccoli yellowing. Dipping florets (cv. `Shogun') in 6-benzylaminopurine (6-BA) stimulated ethylene production, depressed respiration rate and delayed floret yellowing. The effect of cytokinin on broccoli yellowing was related to cytokinin concentration and postharvest floret age when the cytokinin was applied. A continuous propylene treatment reduced the positive effect of cytokinin on broccoli colour changes.