Shoot thinning effects on seasonal whole‐canopy photosynthesis and vine performance in Vitis vinifera L. cv. Barbera

摘要: Background and Aims:  While shoot thinning is one of the most widely applied practices in vineyard as a tool to regulate canopy density and/or crop level, its physiological bases are still fairly obscure have been poorly investigated. Our aim was assess seasonal modification whole-canopy net CO2 exchange rate (NCER) thinned non-thinned grapevines, well establishing correlations with grape composition. Methods Results:  Potted, mature cv. Barbera vines were (ST) 10–15 shoots/m over two trial years compared control (C). The data logged each season included whole-vine NCER monitored pre- post-veraison for periods variable lengths, vine growth, yield components composition. final leaf area per did not differ between treatments, ST showed reduced improved berry colour must sugar accumulation. In 2009, NCER/vine recovery 85% C at verasion, whereas 2010 full already reached around bloom. Conclusions:  A load 15 maximised efficiency by inducing fastest photosynthesis markedly sugar, phenolics. Retaining 10 delayed while improving overall composition C. Significance Study:  Direct assessment complex dynamics triggered indicates that source-sink balance evolves towards higher supply assimilates unit than available canopies during veraison-to-harvest period.