At non-refrigerated temperatures the main cause of deterioration
in Brassica species is the rapid yellowing of leaves and
flowering buds due to chlorophyll degradation as shown in pak
choy and broccoli (Wang, 1979; Hirata et al., 1987; Wang and
Herner, 1989); decay is also the main cause of postharvest loss
(Pogson and Morris, 1997). Fresh broccoli raab is harvested when
flowering heads are immature and hence highly perishable, with
a storage life of 2–3 days in air at 20 ◦C, while storage in low oxygen
(3%) extended marketability until 17 days at 5 ◦C