Water stress during the post-harvest period affects new root formation but not starch concentration and content in Chardonnay grapevine (Vitis vinifera L.) perennial organs

摘要: Abstract Water stress responses during the post-harvest period were evaluated in a Chardonnay container-grown grapevines grafted onto 1103 Paulsen rootstock. The irrigation treatments were: control treatment (C) (irrigated to match ETC demands) and water (WS) when midday stem potential reached -1.1 MPa threshold). Photosynthesis, biomass carbohydrate content determined on five vines each specific dates, from harvest until leaf fall. Stressed reduced area due defoliation, while well-watered had higher carbon accumulation allowing formation of new roots period. No dry was observed shoot trunk organs after fruit harvest. Starch concentration not affected by stress. At end experiment, starch concentrations lower shoots than roots. induced variation between above below ground perennial organs, with being main which accumulated kept, respectively.