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Postharvest calcium chloride treatments do not help to increase shelf-life of bananas

Published online by Cambridge University Press:  15 April 2002

Antenette Niranjala Perera  and
Anjani Manjulika Karunaratne
Antenette Niranjala Perera
Affiliation:
Department of Botany, Faculty of Science, University of Peradeniya, Sri Lanka
Anjani Manjulika Karunaratne
Affiliation:
Department of Botany, Faculty of Science, University of Peradeniya, Sri Lanka
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Abstract

Introduction. Calcium chloride (CaCl2) treatment has been shown to increase the shelf-life of fruits, mainly through making cell walls less accessible to pathogens and softening enzymes. Materials and methods. bananas of four cultivars [`Ambon' (AAA), `Embul' (AAB), `Kolikuttu' (AAB) and `Seenikehel' (ABB)] were dipped in or pressure infiltrated with 4% CaCl2. To determine the effect of exogenous ethylene on treated fruits, they were ripened with exogenous ethylene. Ca2+ in cell wall fractions were monitored by atomic absorption spectrophotometry. Cup plate assays were performed to determine pectinase activity. Results and discussion. Pressure infiltration accelerated ripening and disease, and reduced firmness (P < 0.05). However, when exposed to ethylene, CaCl2 pressure-infiltrated bananas were insignificantly firmer than distilled water-infiltrated and ethylene-ripened bananas, showing a significant interaction (P < 0.05) between infiltration treatments and ethylene ripening. There was no consistent increase in covalently bound pectin of cell walls as seen in fruits that respond positively to CaCl2. Firmness reduction and ripening acceleration by Ca2+ treatment cannot be explained if polygalacturonase (PG) (known to be inhibited by Ca2+) was the dominant pectinase. Enzyme assays gave evidence of PG activity. When ammonium oxalate (known to bind Ca2+) was eliminated from the test medium, pectinase activity increased with increasing pH (pH 5 to 9). The presence of a pectinase enzyme which exhibits activity in the presence of Ca2+ is apparent. Conclusion. Ca2+ does not appear to influence cell wall structure of bananas but appears to influence ripening physiology.

Keywords

Sri LankaMusa (fruits)storagecalcium chloridepostharvest physiologypostharvest decaypolygalacturonaseSri LankaMusa (fruit)stockagechlorure de calciumphysiologie après récoltemaladie post récoltepolygalacturonase
Type
Research Article
Information
Fruits , Volume 57 , Issue 2 , March 2002 , pp. 87 - 94
Copyright
© CIRAD, EDP Sciences

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