Predicting osmotic potential from measurements of refractive index in cherries, grapes and plums

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dc.identifier.uri Winkler, Andreas Knoche, Moritz 2019-01-11T08:57:41Z 2019-01-11T08:57:41Z 2018
dc.identifier.citation Winkler, A.; Knoche, M.: Predicting osmotic potential from measurements of refractive index in cherries, grapes and plums. In: PLoS One 13 (2018), Nr. 11, e0207626. DOI:
dc.description.abstract Studies of fruit tree water relations often require data on water potentials of fruit. However, this is sometimes difficult because the fruit stalks are not sufficiently long for use in a pressure bomb. Also, because fruit xylem function is often lost during maturation. In the absence of significant turgor, the osmotic potential of the expressed juice is a useful proxy for a fruit's water potential. The osmotic potential of most fleshy fruit is determined largely by the concentration of soluble carbohydrates and this can be quantified by osmometry. Soluble solids may also be quantified by refractometry. Compared with osmometry, refractometry is markedly less expensive and also much faster. Hence, it is better suited to high-throughput analyses. The objective of this study was to establish relationships between the osmotic potentials of juices expressed from sweet cherries and sour cherries, grapes and plums as determined using a vapor pressure osmometer and their soluble solids concentrations as determined using a refractometer. The data reveal close relationships within all these species. Except for plums, the relationships between species were almost identical. This is due to similarity among cultivars and species in the relative abundances of the same set of major osmolytes-i.e. the carbohydrates glucose, fructose and sorbitol and the potassium salts of the organic acids malate or tartrate. For plums, the relationship between osmotic potential and soluble solids concentration was slightly displaced. Our findings indicate osmotic potentials may be reliably predicted from soluble solids concentrations determined by refractometry. eng
dc.language.iso eng
dc.publisher San Francisco, CA : Public Library of Science (PLoS)
dc.relation.ispartofseries PLoS One 13 (2018), Nr. 11
dc.rights CC BY 4.0 Unported
dc.subject cherries eng
dc.subject fruits eng
dc.subject grapes eng
dc.subject osmotic pressure eng
dc.subject plums eng
dc.subject vapor pressure eng
dc.subject glucose eng
dc.subject centrifugation eng
dc.subject.ddc 500 | Naturwissenschaften ger
dc.subject.ddc 610 | Medizin, Gesundheit ger
dc.title Predicting osmotic potential from measurements of refractive index in cherries, grapes and plums
dc.type article
dc.type Text
dc.relation.issn 1932-6203
dc.bibliographicCitation.issue 11
dc.bibliographicCitation.volume 13
dc.bibliographicCitation.firstPage e0207626
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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