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Leaf-to-Fruit Ratios in Vitis vinifera L. cv. “Sauvignon Blanc”, “Carmenère”, “Cabernet Sauvignon”, and “Syrah” Growing in Maule Valley (Chile): Influence on Yield and Fruit Composition

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Centro Tecnológico de la Vid y el Vino, Facultad de Ciencias Agrarias, Universidad de Talca, Av. Lircay S/N, Talca 3460000, Chile
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Instituto de Investigaciones Agropecuarias, INIA Raihuén, Casilla 34, San Javier 3650000, Chile
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Instituto de Investigaciones Agropecuarias, INIA Intihuasi, Colina San Joaquín s/n, P.O. Box 36-B, La Serena 1760000, Chile
*
Author to whom correspondence should be addressed.
Agriculture 2019, 9(8), 176; https://doi.org/10.3390/agriculture9080176
Received: 24 May 2019 / Revised: 26 June 2019 / Accepted: 27 June 2019 / Published: 9 August 2019
(This article belongs to the Special Issue Sustainable Viticulture)
A trial was conducted during the 2005–2006 season in order to determine the effects of different leaf-to-fruit ratios on yield components and fruit composition in four Vitis vinifera L. cultivars. The treatments consisted of selecting shoots of four lengths (>1.3 m, 1.3–0.8 m, 0.8–0.4 m, and <0.4 m) with two crop levels (1–2 clusters/shoot), which allowed defining eight ratios. Berry composition and yield components were measured. The treatments affected the accumulation of soluble solids in “Sauvignon blanc”, “Cabernet Sauvignon”, and “Syrah”, delaying it as the ratio decreased. All yield components were affected in “Sauvignon blanc”, while bunch weight and the number of berries per bunch were altered without a clear trend. None of the yield components were affected in “Cabernet Sauvignon”, while the lowest ratio presented the lowest number of berries per bunch in “Syrah”. Total polyphenol index (TPI) was affected in “Carmenère” without a clear trend. A highly significant correlation was found between shoot length and leaf area in all studied cultivars. As the ratio increased, the shoot lignification increased in “Sauvignon blanc”. However, studies must be conducted during more seasons to establish better conclusions about the effects of leaf-to-fruit ratios on yield and fruit composition. View Full-Text
Keywords: crop load; leaf area; leaf-to-fruit ratio; lignification; phenolic composition crop load; leaf area; leaf-to-fruit ratio; lignification; phenolic composition
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Gutiérrez-Gamboa, G.; Díaz-Galvéz, I.; Verdugo-Vásquez, N.; Moreno-Simunovic, Y. Leaf-to-Fruit Ratios in Vitis vinifera L. cv. “Sauvignon Blanc”, “Carmenère”, “Cabernet Sauvignon”, and “Syrah” Growing in Maule Valley (Chile): Influence on Yield and Fruit Composition. Agriculture 2019, 9, 176.

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