Leaf area to fruit weight ratios for maximising grape berry weight, sugar concentration and anthocyanin content during ripening

I. Auzmendi, B. P. Holzapfel

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3 Citations (Scopus)

Abstract

Vineyard management requires the maintenance of the leaf area per unit weight of fruit necessary for growing grapes without detrimental effects on fruit composition. Leaf removal and bunch thinning experiments have previously shown some effects on berry composition. Several berry compositional parameters (e.g. berry weight, sugar concentration and colour) increase with leaf area to fruit weight ratio until reaching an optimum or saturation point. Further increases in the ratio do not have any significant effect. However, optimum ratios from previous experiments have been determined only at harvest and they are highly variable. Irrigated Merlot grapevines were used to study the relationship between leaf area to fruit weight ratio and mean berry weight, sugar concentration and anthocyanin content during ripening. Four defoliation treatments were applied to individual girdled shoots at berry pea size stage. After veraison, leaf and fruit samples were collected weekly until berry maturity and leaf area, fruit weight per shoot, berry weight, sugar concentration and anthocyanins were measured. Berry weight, sugar concentration and anthocyanin content were correlated with leaf area to fruit weight ratio from veraison through to maturity. The fitted regressions allowed us to determine the ratios that maximised the measured compositional parameters. Leaf area per fruit weight necessary for maximum berry weight was more variable than that for sugar concentration and anthocyanin content. Greater leaf area to fruit weight was required for maximising anthocyanin content than that for sugar concentration. We defined optimum leaf area to fruit weight ratios within certain ranges for the ripening period in our vineyard.

Original languageEnglish
Pages (from-to)127-132
Number of pages6
JournalActa Horticulturae
Volume1115
DOIs
Publication statusPublished - 31 Mar 2016

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anthocyanins
grapes
ripening
leaf area
sugars
small fruits
fruits
vineyards
fruit composition
shoots
fruit growing
defoliation
thinning (plants)
sugar content
leaves
peas
color

Cite this

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abstract = "Vineyard management requires the maintenance of the leaf area per unit weight of fruit necessary for growing grapes without detrimental effects on fruit composition. Leaf removal and bunch thinning experiments have previously shown some effects on berry composition. Several berry compositional parameters (e.g. berry weight, sugar concentration and colour) increase with leaf area to fruit weight ratio until reaching an optimum or saturation point. Further increases in the ratio do not have any significant effect. However, optimum ratios from previous experiments have been determined only at harvest and they are highly variable. Irrigated Merlot grapevines were used to study the relationship between leaf area to fruit weight ratio and mean berry weight, sugar concentration and anthocyanin content during ripening. Four defoliation treatments were applied to individual girdled shoots at berry pea size stage. After veraison, leaf and fruit samples were collected weekly until berry maturity and leaf area, fruit weight per shoot, berry weight, sugar concentration and anthocyanins were measured. Berry weight, sugar concentration and anthocyanin content were correlated with leaf area to fruit weight ratio from veraison through to maturity. The fitted regressions allowed us to determine the ratios that maximised the measured compositional parameters. Leaf area per fruit weight necessary for maximum berry weight was more variable than that for sugar concentration and anthocyanin content. Greater leaf area to fruit weight was required for maximising anthocyanin content than that for sugar concentration. We defined optimum leaf area to fruit weight ratios within certain ranges for the ripening period in our vineyard.",
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N2 - Vineyard management requires the maintenance of the leaf area per unit weight of fruit necessary for growing grapes without detrimental effects on fruit composition. Leaf removal and bunch thinning experiments have previously shown some effects on berry composition. Several berry compositional parameters (e.g. berry weight, sugar concentration and colour) increase with leaf area to fruit weight ratio until reaching an optimum or saturation point. Further increases in the ratio do not have any significant effect. However, optimum ratios from previous experiments have been determined only at harvest and they are highly variable. Irrigated Merlot grapevines were used to study the relationship between leaf area to fruit weight ratio and mean berry weight, sugar concentration and anthocyanin content during ripening. Four defoliation treatments were applied to individual girdled shoots at berry pea size stage. After veraison, leaf and fruit samples were collected weekly until berry maturity and leaf area, fruit weight per shoot, berry weight, sugar concentration and anthocyanins were measured. Berry weight, sugar concentration and anthocyanin content were correlated with leaf area to fruit weight ratio from veraison through to maturity. The fitted regressions allowed us to determine the ratios that maximised the measured compositional parameters. Leaf area per fruit weight necessary for maximum berry weight was more variable than that for sugar concentration and anthocyanin content. Greater leaf area to fruit weight was required for maximising anthocyanin content than that for sugar concentration. We defined optimum leaf area to fruit weight ratios within certain ranges for the ripening period in our vineyard.

AB - Vineyard management requires the maintenance of the leaf area per unit weight of fruit necessary for growing grapes without detrimental effects on fruit composition. Leaf removal and bunch thinning experiments have previously shown some effects on berry composition. Several berry compositional parameters (e.g. berry weight, sugar concentration and colour) increase with leaf area to fruit weight ratio until reaching an optimum or saturation point. Further increases in the ratio do not have any significant effect. However, optimum ratios from previous experiments have been determined only at harvest and they are highly variable. Irrigated Merlot grapevines were used to study the relationship between leaf area to fruit weight ratio and mean berry weight, sugar concentration and anthocyanin content during ripening. Four defoliation treatments were applied to individual girdled shoots at berry pea size stage. After veraison, leaf and fruit samples were collected weekly until berry maturity and leaf area, fruit weight per shoot, berry weight, sugar concentration and anthocyanins were measured. Berry weight, sugar concentration and anthocyanin content were correlated with leaf area to fruit weight ratio from veraison through to maturity. The fitted regressions allowed us to determine the ratios that maximised the measured compositional parameters. Leaf area per fruit weight necessary for maximum berry weight was more variable than that for sugar concentration and anthocyanin content. Greater leaf area to fruit weight was required for maximising anthocyanin content than that for sugar concentration. We defined optimum leaf area to fruit weight ratios within certain ranges for the ripening period in our vineyard.

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