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Preharvest temperature affects chilling injury in dessert bananas during storage

Bugaud C., Joannès-Dumec C., Louisor J., Tixier P., Salmon F.. 2016. Journal of the Science of Food and Agriculture, 96 (7) : p. 2384-2390.

BACKGROUND: The e?ect of temperature on chilling injury during fruit growth was studied in a new banana hybrid CIRAD925 in which seasonal variability in chilling susceptibility was observed when fruits were stored at 13 ? C. RESULTS: The relationship between the response to chilling (presence/absence) and the temperature during banana fruit growth was examined with a logistic regression model. An explanatory variable X N,P was de?ned as the mean temperature during a period, expressed in weeks, which began N week(s) after ?owering and lasted P week(s). The model was calibrated with 143 bunches with a green life of 30 ± 5 days and validated with 156 bunches grown in six plots under di?erent growing conditions. Chilling injury was best predicted by the mean temperature during the period beginning 1 week after ?owering and lasting 5 weeks (X 1,5 ). Above a mean temperature of 24.1 ? C in the period concerned, banana fruits had a 95% probability of chilling injury at 13 ? C. Below a temperature of 23.4 ? C, banana fruits only had a 5% probability of chilling injury. CONCLUSION: The results provide a tool to predict chilling susceptibility in banana fruit whatever the thermal conditions in tropical regions. (Résumé d'auteur)

Mots-clés : stress dû au froid; croissance; modèle mathématique; date de récolte; stockage au froid; récolte; température; banane; musa

Thématique : Physiologie végétale : croissance et développement; Manutention transport stockage et conservation des produits d'origine végétale

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