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A possibility for non-invasive diagnosis of superficial scald in 'Rocha' pear based on chlorophyll a fluorescence, colorimetry, and the relation between alpha-farnesene and conjugated trienols

2012Journal article Restricted access
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dc.contributor.authorGuerra, Rui Manuel Farinha das Neves
dc.contributor.authorGarde, I. V.
dc.contributor.authorAntunes, Maria Dulce
dc.contributor.authorda Silva, J. M.
dc.contributor.authorAntunes, Rosário
dc.contributor.authorCavaco, A. M.
dc.date.accessioned2015-06-19T13:47:31Z
dc.date.available2015-06-19T13:47:31Z
dc.date.issued2012
dc.description.abstractThis study aimed to identify physiological markers in superficially scalded 'Rocha' pear (Pyrus communis L 'Rocha') that would relate to chlorophyll a fluorescence (CF), allowing a non-invasive diagnosis of the disorder. Conditions chosen before shelf life provided two fruit groups with different developing patterns and severity of superficial scald: T fruit fully developed the disorder in storage, while C fruit developed it progressively throughout shelf life. Principal component analysis (PCA) of all the measured variables, and simple linear correlations among several major parameters and scald index (SI)/shelf life showed that scald and ripening/aging were concurring processes, and that it was not possible to isolate a particular variable that could deliver a direct non-invasive diagnosis of the disorder. For both fruit groups the SI resulted from the balance between the reducing power (OD200) and the content of conjugated trienols (CTos) and alpha-farnesene (alpha-Farn) in the fruit peel. At OD200 > 150 there was a linear relationship between CTos and OD200, suggesting that the level of antioxidants was self-adjusted in order to compensate the CTos level. However, at OD200 < 150 this relationship disappeared. A consistent linear relationship between dos and alpha-Farn existed throughout shelf life in both fruit groups, contrarily to the early storage stage, when those compounds do not relate linearly. The CF variables F-0, F-v/F-m, and the colorimetric variables, L* and h degrees were used in multi-linear regressions with other physiological variables. The regressions were made on one of the fruit groups and validated through the other. Reliable regressions to alpha-Farn and CTos were obtained (R approximate to 0.6; rmsec approximate to rmsep). Our results suggest that a model based on CF and colorimetric parameters could be used to diagnose non-invasively both the contents and the relationship between alpha-Farn and CTos and hence the stage of scald development. (C) 2011 Elsevier By. All rights reserved.
dc.identifier.doihttps://dx.doi.org/10.1016/j.scienta.2011.11.017
dc.identifier.issn0304-4238
dc.identifier.otherAUT: MAN00114;
dc.identifier.urihttp://hdl.handle.net/10400.1/6468
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relation.isbasedonP-002-DEC
dc.titleA possibility for non-invasive diagnosis of superficial scald in 'Rocha' pear based on chlorophyll a fluorescence, colorimetry, and the relation between alpha-farnesene and conjugated trienols
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage138
oaire.citation.startPage127
oaire.citation.titleScientia Horticulturae
oaire.citation.volume134
person.familyNameGuerra
person.familyNameAntunes
person.familyNameCavaco Guerra
person.givenNameRui
person.givenNameMaria Dulce
person.givenNameAna Margarida
person.identifier177556
person.identifierC-1285-2012
person.identifier.ciencia-id3D16-5067-D6BB
person.identifier.ciencia-idC11B-9B05-217E
person.identifier.ciencia-idC91E-B434-E327
person.identifier.orcid0000-0002-8642-5792
person.identifier.orcid0000-0002-8913-6136
person.identifier.orcid0000-0003-2708-5991
person.identifier.ridA-4683-2012
person.identifier.scopus-author-id7102645075
person.identifier.scopus-author-id6602899707
rcaap.rightsrestrictedAccess
rcaap.typearticle
relation.isAuthorOfPublicationeff7071e-e676-465b-bae3-983f522acd98
relation.isAuthorOfPublication7947cc50-4ae0-4ada-8ddf-081f247adc90
relation.isAuthorOfPublication18ad736f-b1f3-4a19-9636-e7a80248cf94
relation.isAuthorOfPublication.latestForDiscovery18ad736f-b1f3-4a19-9636-e7a80248cf94

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