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Bragantia

versão impressa ISSN 0006-8705versão On-line ISSN 1678-4499

Resumo

MARTIN, Mariuccia Schlichting De et al. Flesh browning in ‘Rocha’ pear as affected by fruit mineral composition and controlled atmosphere conditions. Bragantia [online]. 2017, vol.76, n.2, pp.318-326.  Epub 15-Maio-2017. ISSN 0006-8705.  http://dx.doi.org/10.1590/1678-4499.664.

The aim of this study was to evaluate the effect of controlled atmosphere (CA) conditions and mineral contents on flesh browning in ‘Rocha’ pear. The fruits were stored at different CA conditions: 0.5 kPa O2 + < 0.03 kPa CO2; 1.0 kPa O2 + < 0.03 kPa CO2; 1.0 kPa O2 + 1.0 kPa CO2; 1.0 kPa O2 + 2.0 kPa CO2 and 1.0 kPa O2 + 3.0 kPa CO2. Fruit were evaluated for incidence and severity of flesh browning after 9 months of storage (−0.5 ± 0.1 °C and 96 ± 2% RH). Also, fruit with and without the disorder were assessed for contents of Ca, Mg, K, and N, as well as the K/Ca, Mg/Ca, and N/Ca ratios. Fruit stored at 1.0 kPa O2 + 3.0 kPa CO2 had higher incidence of flesh browning than those stored at 0.5 kPa O2 + < 0.03 kPa CO2 and 1.0 kPa O2 + < 0.03 kPa CO2, as well as higher severity of disorder than all the other storage conditions. Pears with flesh browning had lower Ca content, as well as higher K content and higher K/Ca, Mg/Ca, and N/Ca ratios than fruit without the disorder. However, the multivariate analysis of all these mineral elements showed that the K/Ca ratio provides the best discrimination between fruit with and without flesh browning in ‘Rocha’ pears.

Palavras-chave : Pyrus communis; canonical discriminant analysis; storage; calcium deficiency; physiological disorder.

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