Articles
DOES BORON AFFECT THE OCCURRENCE OF PHYSIOLOGICAL DISORDERS OF CONFERENCE PEARS DURING CA-STORAGE?
Article number
596_148
Pages
857 – 861
Language
English
Abstract
Under CO2 -enriched CA-storage conditions Conference pear is susceptible to internal flesh browning disorders, such as brownheart and cavities.
The effect of pre-harvest boron (B) application on the occurrence of these disorders and on the enzymatic antioxidative activities concerned with ascorbate metabolism and on the lipid peroxidation of membranes in pear fruits stored under high CO2 CA conditions was tested.
Several times before harvest, trees of Conference pear were sprayed with B. After harvest the fruits were stored in CA conditions (-0.5 7deg;C, 5% CO2, 2% O2). During 4 months of storage, the pears were rated for physiological disorders as well as mineral concentrations, vitamin C content, antioxidative enzymes and polyphenol oxidase activity, and lipid peroxidation and the permeability of cell membranes were determined.
The results demonstrated that control fruits were already highly affected by brownheart after 2 months of storage.
On the other hand fruits treated with B did not exhibit any flesh browning disorder.
B treatment substantially increased the B concentration and vitamin C content in the fruit flesh.
At harvest, B treated pears exhibited a significantly lower membrane permeability and lower content of lipid peroxides in connection with reduced activities of LOX and PPO, but there were little differences in activity of antioxidative enzymes between B-treated and control fruits.
It seemed that antioxidative defence enzymes may play a minor role for avoiding browning disorders in Conference pear.
The effect of pre-harvest boron (B) application on the occurrence of these disorders and on the enzymatic antioxidative activities concerned with ascorbate metabolism and on the lipid peroxidation of membranes in pear fruits stored under high CO2 CA conditions was tested.
Several times before harvest, trees of Conference pear were sprayed with B. After harvest the fruits were stored in CA conditions (-0.5 7deg;C, 5% CO2, 2% O2). During 4 months of storage, the pears were rated for physiological disorders as well as mineral concentrations, vitamin C content, antioxidative enzymes and polyphenol oxidase activity, and lipid peroxidation and the permeability of cell membranes were determined.
The results demonstrated that control fruits were already highly affected by brownheart after 2 months of storage.
On the other hand fruits treated with B did not exhibit any flesh browning disorder.
B treatment substantially increased the B concentration and vitamin C content in the fruit flesh.
At harvest, B treated pears exhibited a significantly lower membrane permeability and lower content of lipid peroxides in connection with reduced activities of LOX and PPO, but there were little differences in activity of antioxidative enzymes between B-treated and control fruits.
It seemed that antioxidative defence enzymes may play a minor role for avoiding browning disorders in Conference pear.
Publication
Authors
H. Xuan, J. Streif, F. Bangereth
Keywords
brown heart, cavity, conductivity, ascorbate, superoxide dismutase, catalase, ascorbate peroxidase, dehydroascorbate reductase, glutathion reductase
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