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Article

Water Influx through the Wetted Surface of a Sweet Cherry Fruit: Evidence for an Associated Solute Efflux

1
Institute of Horticultural Production Systems, Leibniz University Hannover, Herrenhäuser Straße 2, 30419 Hannover, Germany
2
Competence Centre for Fruit Growing—Lake Constance (KOB), Schumacherhof 6, 88213 Ravensburg, Germany
*
Author to whom correspondence should be addressed.
Plants 2020, 9(4), 440; https://doi.org/10.3390/plants9040440
Received: 6 March 2020 / Revised: 26 March 2020 / Accepted: 28 March 2020 / Published: 2 April 2020
Sweet cherries are susceptible to rain-cracking. The fruit skin is permeable to water, but also to solutes. The objectives of this study were to (1) establish whether a solute efflux occurs when a sweet cherry fruit is incubated in water; (2) identify the solutes involved; (3) identify the mechanism(s) of efflux; and (4) quantify any changes in solute efflux occurring during development and storage. Solute efflux was gravimetrically measured in wetted fruit as the increasing dry mass of the bathing solution, and anthocyanin efflux was measured spectrophotometrically. Solute and anthocyanin effluxes from a wetted fruit and water influx increased with time. All fluxes were higher for the cracked than for the non-cracked fruit. The effluxes of osmolytes and anthocyanins were positively correlated. Solute efflux depended on the stage of development and on the cultivar. In ‘Regina’, the solute efflux was lowest during stage II (25 days after full bloom (DAFB)), highest for mid-stage III (55 DAFB), and slightly lower at maturity (77 DAFB). In contrast with ‘Regina’, solute efflux in ‘Burlat’ increased continuously towards maturity, being 4.8-fold higher than in ‘Regina’. Results showed that solute efflux occurred from wetted fruit. The gravimetrically determined water uptake represents a net mass change—the result of an influx minus a solute efflux. View Full-Text
Keywords: Prunus avium; cracking; leakage; osmolyte; uptake; penetration Prunus avium; cracking; leakage; osmolyte; uptake; penetration
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MDPI and ACS Style

Winkler, A.; Riedel, D.; Neuwald, D.A.; Knoche, M. Water Influx through the Wetted Surface of a Sweet Cherry Fruit: Evidence for an Associated Solute Efflux. Plants 2020, 9, 440. https://doi.org/10.3390/plants9040440

AMA Style

Winkler A, Riedel D, Neuwald DA, Knoche M. Water Influx through the Wetted Surface of a Sweet Cherry Fruit: Evidence for an Associated Solute Efflux. Plants. 2020; 9(4):440. https://doi.org/10.3390/plants9040440

Chicago/Turabian Style

Winkler, Andreas, Deborah Riedel, Daniel A. Neuwald, and Moritz Knoche. 2020. "Water Influx through the Wetted Surface of a Sweet Cherry Fruit: Evidence for an Associated Solute Efflux" Plants 9, no. 4: 440. https://doi.org/10.3390/plants9040440

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