首页|Thinning of cluster improves berry composition and sugar accumulation in Syrah grapes
Thinning of cluster improves berry composition and sugar accumulation in Syrah grapes
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NSTL
Elsevier
? 2022The sugars in grapes are crucial determinants of superior enological characteristics and product value. Recent research revealed that cluster thinning (CT) can increase sugar content and further modify the grape composition. This study examined the effects of cluster thinning at veraison on berry soluble sugar, organic acid, phenolic compound and sugar unloading-related gene expression of Syrah grapes. The effects of three CT levels on grape composition were investigated over two growing seasons. Two clusters per shoot remained (CT1) and one cluster per shoot remained (CT2) was compared with a control (CK, three clusters per shoot remained usually). Results showed that cluster thinning significantly improved the reducing sugar and soluble solids content of the CT2 group. Meanwhile, hexose (glucose and fructose), total anthocyanin and tannin contents in the CT group were significantly higher than in the control group at harvest for both vintages. In addition, under the CT treatments, the titratable acid and malic acid contents were decreased, but no effects on tartaric acid and citric acid contents were observed. At harvest, CT2 was the most significant treatment for increasing VvHTs (VvHT2-3, 5 and 6) expression, followed by CT1. Moreover, correlation analysis results show that VvSUC11, VvSUC12, VvcwINV, VvSS and VvHT5 were positively correlated with hexose and reducing sugars. Our results suggested that the remaining one cluster per shoot (CT2) may be useful for increasing the soluble sugar and improving grape composition in cool climate regions.
NSTL
Elsevier
