Biochemical and agronomical responses of grapevines to alteration of source-sink ratio by cluster thinning and shoot trimming

Bragantia

Renata Vieira Da Mota²  Claudia Rita De Souza²  Camila Pinheiro Carvalho Silva²  Gustavo De Faria Freitas¹  Tânia Misuzu Shiga¹  Eduardo Purgatto¹  Franco Maria Lajolo¹  Murillo De Albuquerque Regina² 

[1] ,EPAMIG Uva e VinhoCaldas MG

关键词: Vitis vinifera;    cluster removal;    canopy management;    Ravaz index;    fruit composition;    Vitis vinifera;    remoção de cachos;    manejo do dossel;    Índice de Ravaz;    composição dos frutos;   

DOI  :  10.1590/S0006-87052010000100004

来源: SciELO

【 摘 要 】

The control of leaf to fruit ratio by the practice of entire clusters removal from the vine upon berry set has been used in traditional vineyards in order to regulate yield and to improve chemical composition of the berries. Although this practice has been settled in temperate zones, little is known about grapevines behavior in tropical growing areas. The aim of this work was to evaluate the biochemical and agronomical responses of two Vitis vinifera cultivars (Merlot and Cabernet Sauvignon) grown in Caldas, Minas Gerais, Brazil, a new winegrape region. Grapevines were submitted to cluster thinning (0%, 50% and 75% of cluster removal) and trimming treatments (trimmed and untrimmed) imposed at pea size stage. The source-sink alteration by fruit removal and shoot trimming had impact on yield, leaf sugar metabolism and grape composition. Although there was an improvement in color intensity of the berries with reduction of fruit load, the cluster thinning practice should be avoided in vineyards grown in the south of Minas Gerais State without impairment of wine grape quality. On the other hand, shoot trimming practice should be recommended only for Merlot in order to improve sugar grapes from vines with no cluster removal.

【 授权许可】

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