Abstract
Mangoes are tropical fruits and therefore chilling-sensitive. Storage of these fruits at low temperature can cause chilling injury. Since peroxidase (POD) and polyphenol oxidase (PPO) are involved in the metabolism of phenolic compounds and in the development of several physiological disorders, as chilling injury (CI), we have undertaken to study the effect of low temperature storage on the activation of these enzymes in mangoes. Some characteristics of PPO and POD were investigated. Maximum activities of PPO were found at pH 8,0 and 7,5 for skin and pulp respectively. In both cases the optimum temperature was 40°C. Maximum activities of POD were found at pH 5,0 while the optimum temperatures were 60°C and 30°C for peel and pulp. 'Kent', 'Keitt' and 'Manila' mangoes were stored at 5°C during 25 days and rewarmed at 20°C until ripening. CI symptoms in peel were more severe than in pulp. PPO activity increased in peel and pulp of mangoes stored at 5°C. PDO activity increased in pulp and showed lower activity in peel. Correlation was found between CI index and PPO activity in mangoes.
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Claims 11
Claim · model-written summary
Skin PPO activity peaked at pH 8,0.
Verbatim
e0“Maximum activities of PPO were found at pH 8,0 and 7,5 for skin and pulp respectively.”
t0“MANGOES”
Claim · model-written summary
Pulp PPO activity peaked at pH 7,5.
Verbatim
e0“Maximum activities of PPO were found at pH 8,0 and 7,5 for skin and pulp respectively.”
t0“MANGOES”
Claim · model-written summary
PPO optimum temperature was 40°C in skin and pulp.
Verbatim
e0“In both cases the optimum temperature was 40°C.”
t0“MANGOES”
Claim · model-written summary
POD activity peaked at pH 5,0.
Verbatim
e0“Maximum activities of POD were found at pH 5,0 while the optimum temperatures were 60°C and 30°C for peel and pulp.”
t0“MANGOES”
Claim · model-written summary
POD optimum temperature in peel was 60°C.
Verbatim
e0“the optimum temperatures were 60°C and 30°C for peel and pulp.”
t0“MANGOES”
Claim · model-written summary
POD optimum temperature in pulp was 30°C.
Verbatim
e0“the optimum temperatures were 60°C and 30°C for peel and pulp.”
t0“MANGOES”
Claim · model-written summary
Chilling injury was more severe in peel than pulp.
Verbatim
e0“CI symptoms in peel were more severe than in pulp.”
t0“MANGOES”
Claim · model-written summary
Cold storage increased PPO activity in mango peel and pulp.
- Taxon
- mangoes
_from_India.jpg?width=60)
Mangifera indicae0 - Organ / stage
- peel and pulpe0
- Treatment
- stored at 5°Ce0
- Gene
- PPOe0
- Outcome
- PPO activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_from_India.jpg?width=500)
Verbatim
e0“PPO activity increased in peel and pulp of mangoes stored at 5°C.”
Claim · model-written summary
POD activity increased in pulp.
Verbatim
e0“PDO activity increased in pulp and showed lower activity in peel.”
t0“MANGOES”
Claim · model-written summary
POD activity was lower in peel.
Verbatim
e0“PDO activity increased in pulp and showed lower activity in peel.”
t0“MANGOES”
Claim · model-written summary
Chilling injury index correlated with PPO activity.
- Taxon
- mangoesMangifera indicae0
- Gene
- PPOe0
- Outcome
- CI indexe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Correlation was found between CI index and PPO activity in mangoes.”
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