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JXB Advance Access originally published online on September 4, 2009
Journal of Experimental Botany 2009 60(15):4315-4333; doi:10.1093/jxb/erp267
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© The Author [2009]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Biochemical and proteomic analysis of ‘Dixiland’ peach fruit (Prunus persica) upon heat treatment

María V. Lara1, Julia Borsani1, Claudio O. Budde2, Martin A. Lauxmann1, Verónica A. Lombardo1, Ricardo Murray2, Carlos S. Andreo1 and María F. Drincovich1,*

1Centro de Estudios Fotosintéticos y Bioquímicos (CEFOBI), Universidad Nacional de Rosario, Suipacha 531, Rosario, Argentina
2Estación Experimental San Pedro, Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta Nacional nº 9 Km 170, San Pedro, Argentina

* To whom correspondence should be addressed. E-mail: drincovich{at}cefobi-conicet.gov.ar

Shipping of peaches to distant markets and storage require low temperature; however, cold storage affects fruit quality causing physiological disorders collectively termed ‘chilling injury’ (CI). In order to ameliorate CI, different strategies have been applied before cold storage; among them heat treatment (HT) has been widely used. In this work, the effect of HT on peach fruit quality as well as on carbon metabolism was evaluated. When fruit were exposed to 39 °C for 3 d, ripening was delayed, with softening inhibition and slowing down of ethylene production. Several differences were observed between fruit ripening at ambient temperature versus fruit that had been heat treated. However, the major effects of HT on carbon metabolism and organoleptic characteristics were reversible, since normal fruit ripening was restored after transferring heated peaches to ambient temperature. Positive quality features such as an increment in the fructose content, largely responsible for the sweetness, and reddish coloration were observed. Nevertheless, high amounts of acetaldehyde and low organic acid content were also detected. The differential proteome of heated fruit was characterized, revealing that heat-induced CI tolerance may be acquired by the activation of different molecular mechanisms. Induction of related stress proteins in the heat-exposed fruits such as heat shock proteins, cysteine proteases, and dehydrin, and repression of a polyphenol oxidase provide molecular evidence of candidate proteins that may prevent some of the CI symptoms. This study contributes to a deeper understanding of the cellular events in peach under HT in view of a possible technological use aimed to improve organoleptic and shelf-life features.

Key words: Chilling injury, heat treatment, peach, post-harvest, Prunus persica

Received 22 July 2009; Revised 10 August 2009 Accepted 12 August 2009


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