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Physicochemical characterisation of the postharvest senescence of the winter melon "Tendral"

Published online by Cambridge University Press:  15 April 2002

Maria da Graça Barreiro ,
Fernando Cebola Lidon  and
Manuela Pinto
Maria da Graça Barreiro
Affiliation:
Plant Physiology Department, Estaçao Agronómica Nacional, Avenida Republica, Nova Oeiras, 2784-505 Oeiras, Portugal ([email protected])
Fernando Cebola Lidon
Affiliation:
Grupo de Disciplinas de Biologia Vegetal, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Quinta da Torre, 2825 Monte da Caparica, Portugal ([email protected])
Manuela Pinto
Affiliation:
Plant Physiology Department, Estaçao Agronómica Nacional, Avenida Republica, Nova Oeiras, 2784-505 Oeiras, Portugal ([email protected])
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Abstract

Introduction. Tendral type muskmelon is a winter melon fruit having a dark green skinslightly netted and crisp and a white sweet flesh with a long storage life. Materials and methods.The senescence of the mesocarp of the winter melon Cucumis melo L. (Inodorus Group) Tendral,stored at 12 °C and ca. 75% relative humidity, was investigated during 100 d after harvest.Results. During storage, starch and sucrose become increasingly hydrolysed while the levels ofreducing sugars increased. In this period the firmness and titratable acidity decreased, but an increasewas found for protein and lipoperoxide concentrations. The colour parameters L, a and b were alsoaffected, b showing the largest increase after harvest. Ethylene concentration remained minimal but theproduction of carbon dioxide varied significantly. The activities of catalase and glutathione reductaseincreased whereas ascorbate peroxidase and superoxide dismutase were inhibited. Discussion. Thesenescence of winter melon Tendral is coupled to starch and sucrose consumption and to the synthesis oforganic acids required for the respiratory metabolism. Hydrogen peroxide and superoxide also seem toaccumulate, triggering the lipoperoxidation of cellular membranes at a low rate.

Keywords

PortugalCucumis melopostharvest physiologychemicophysical propertiesstoragequalityPortugalCucumis melophysiologie après récoltepropriété physicochimiquestockagequalité
Type
Research Article
Information
Fruits , Volume 56 , Issue 1 , January 2001 , pp. 51 - 58
Copyright
© CIRAD, EDP Sciences

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