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Molecules 2016, 21(12), 1688; doi:10.3390/molecules21121688

Impact of Cluster Zone Leaf Removal on Grapes cv. Regent Polyphenol Content by the UPLC-PDA/MS Method

1
Department of Horticulture, West Pomeranian University of Technology Szczecin, Słowackiego 17 Street, 71-434 Szczecin, Poland
2
Department of Fruit and Vegetable Processing, Wroclaw University of Environmental and Life Sciences, Chełmońskiego 37 Street, 51-630 Wrocław, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Marcello Iriti
Received: 16 October 2016 / Revised: 24 November 2016 / Accepted: 1 December 2016 / Published: 11 December 2016
(This article belongs to the Collection Bioactive Compounds)
View Full-Text   |   Download PDF [635 KB, uploaded 13 December 2016]   |  

Abstract

Abstract: Leaf removal is known to enhance light exposure of clusters and therefore may affect grape composition. Owing to the risk of decreasing grape quality or sunburn as a consequence of improper sun exposure, it is crucial to determine the optimum leaf removal techniques adequate for the particular climate conditions of a vineyard area. Defoliation experiments on vine cv. Regent were conducted in two consecutive years (2014 and 2015). The effect of leaf removal treatment on the qualitative and quantitative composition of the polyphenol compounds in the grapes, with reference to the basic weather conditions of the vineyard area, located in Szczecin in the North-Western part of Poland, was assessed. Defoliation was performed manually in the cluster zone at three phenological plant stages: pre-flowering, berry-set and véraison. Leaf removal, especially early defoliation (pre-flowering), enhanced total polyphenol content, including the amount of anthocyanins, flavonols and flavan-3-ols and furthermore, it increased the amount of soluble solids, decreasing the titratable acidity in grapes. On the other hand, the treatments had a reducing impact on the phenolic acids in berries. Defoliation at earlier stages of cluster development appears to be an efficient strategy for improving berry quality in cool climate areas, however, additionally further weather data control is required to determine the effects on berry components. View Full-Text
Keywords: grapevine; defoliation; UPLC-PDA/MS; anthocyanins; flavan-3-ols; flavonols; phenolic acids; fruit quality grapevine; defoliation; UPLC-PDA/MS; anthocyanins; flavan-3-ols; flavonols; phenolic acids; fruit quality
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mijowska, K.; Ochmian, I.; Oszmiański, J. Impact of Cluster Zone Leaf Removal on Grapes cv. Regent Polyphenol Content by the UPLC-PDA/MS Method. Molecules 2016, 21, 1688.

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