Initial low oxygen stress controls superficial scald of apples
Zhenyong Wang and David R. Dilley
Postharvest Biology and Technology Vol: 18 Issue: 3 Pages: 201-213
2000
บทคัดย่อ
The effectiveness of initial low oxygen stress (ILOS) to control apple scald
without postharvest application of scald inhibitors and fungicides was
investigated. Scald susceptible (`Granny Smith', `Law Rome', `Red Delicious')
and not susceptible (`Idared') fruits were harvested preclimacterically and
treated at 1°C with (1) ILOS pretreatment or (2) no pretreatment
as control. Fruit were then stored at 0.5¯1°C
in 3% O2 with 0% CO2, 1.5% O2 with 3% CO2,
or 0.7¯0.8% O2 with 3% CO2 in
flow-through controlled atmosphere (CA) or in air. ILOS of 0.5 and 0.25% O2
for 2 weeks resulted in excellent control of scald when fruits were
subsequently held in CA (3% O2, 0% CO2). Initial
treatment with 0.25% O2 for 2 weeks, and when this treatment was
supplemented with an additional 2 weeks of low O2 stress after 2
months of storage, were more effective treatment regimens for scald control
than all other treatments. ILOS followed by CA storage at 1.5% O2
gave complete control of scald. A commercial test of initial low O2
stress confirmed its efficacy for controlling scald in several cultivars of
apples. The production of 
-farnesene
and its volatile oxidation product 6-methyl-5-hepten-2-one (MHO) was inhibited
by initial low O2 stress treatments and 1.5% O2 CA. The
0.25% O2 initial stress treatment caused stronger inhibition of -farnesene
and MHO production than 0.5% O2 initial stress treatment. The
accumulation of MHO was related to scald development of apples.