Articles
LOW ETHYLENE CA INDUCES ADVERSE EFFECTS ON THE QUALITY OF QUEEN COX APPLES TREATED WITH AVG DURING FRUIT DEVELOPMENT
Article number
600_65
Pages
441 – 448
Language
English
Abstract
Ethylene
scrubbing of Cox stores reduces fruit softening when used in combination with
treatments that reduce ethylene production such as orchard sprays of daminozide
or pre-storage treatment with high CO2. However, such treatments are
injurious to the fruit when stored for long periods.
Experiments were carried
out to determine the effects of sprays containing AVG (aminoethoxyvinylglycine)
on the ethylene production and quality of Cox apples in low-ethylene CA
storage.
ReTain R (Valent BioSciences Corp.) sprays (123.5g AVG ha-1)
were applied to Queen Cox trees 4 weeks before anticipated harvest.
Fruit was
harvested on 3 occasions and stored in 1.2 kPa O2 (<1 kPa CO2)
at 3.5oC, with and without ethylene removal.
Unsprayed fruit were
treated with 5 kPa CO2 prior to low-ethylene storage.
After storage
until late March / early April (ethylene not removed) ReTain R –
treated fruits were 5.4 N firmer than the unsprayed (averaged for picks). Ethylene
removal improved the firmness of unsprayed fruit by 2.9N and of ReTain R
– treated fruits by 8.0 N. The additive effect on firmness of ReTain R
– treatment and ethylene removal (13.4 N) was negated by the development of
core flush.
After a simulated marketing period 57% of fruits were affected.
Parallels with adverse responses to other methods of suppressing ethylene
production are discussed.
scrubbing of Cox stores reduces fruit softening when used in combination with
treatments that reduce ethylene production such as orchard sprays of daminozide
or pre-storage treatment with high CO2. However, such treatments are
injurious to the fruit when stored for long periods.
Experiments were carried
out to determine the effects of sprays containing AVG (aminoethoxyvinylglycine)
on the ethylene production and quality of Cox apples in low-ethylene CA
storage.
ReTain R (Valent BioSciences Corp.) sprays (123.5g AVG ha-1)
were applied to Queen Cox trees 4 weeks before anticipated harvest.
Fruit was
harvested on 3 occasions and stored in 1.2 kPa O2 (<1 kPa CO2)
at 3.5oC, with and without ethylene removal.
Unsprayed fruit were
treated with 5 kPa CO2 prior to low-ethylene storage.
After storage
until late March / early April (ethylene not removed) ReTain R –
treated fruits were 5.4 N firmer than the unsprayed (averaged for picks). Ethylene
removal improved the firmness of unsprayed fruit by 2.9N and of ReTain R
– treated fruits by 8.0 N. The additive effect on firmness of ReTain R
– treatment and ethylene removal (13.4 N) was negated by the development of
core flush.
After a simulated marketing period 57% of fruits were affected.
Parallels with adverse responses to other methods of suppressing ethylene
production are discussed.
Authors
D.S. Johnson, R.J. Colgan
Keywords
Malus domestica, low-ethylene-storage, AVG, firmness, core-flush
Online Articles (132)