Pre dawn, stem and leaf water potential evolution in Vitis vinifera L. cv Nero d’Avola/1103 P. under different water regime

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Pre dawn, stem and leaf water potential evolution under different water regime were investigated inNero d’Avola cultivar grafted onto 1103 Paulsen.The study was carried out in Rapitalà winery located in Alcamo DOC area in western Sicily. Thevines were 2.4 m x 0.95 m spaced, for a density of 4385 vines/ha.Vines were trained to a vertical trellis system, spur pruned. The vineyard was drip irrigated (4 l/h).Three treatments were applied:1. vines grown without irrigation water: dry condition;2. vines irrigated until véraison with 560 m3 : late stress;3. vines irrigated until ripeness with 1120 m3 : no stress.The aim of the study was to find the different behaviors of Ψp, Ψl e Ψs during the season.Water potential measurements (Pre dawn (Ψp), leaf water potential at midday (Ψl) and Stem waterpotential (Ψs) in bagged leaves at midday, both in shaded leaves) were determined using aScholander Chamber, the day before and after each irrigation.Different water potential methods showed water content variation (in following irrigation) indifferent dates.In dry condition Ψp was good indicator of plant water condition whereas Ψl e Ψs during the season,had variable behaviour. Ψp evidenced better differences, between irrigated and not irrigated vines,compare to Ψs and Ψl respectively. So that Ψp is good indicator of irrigation response, in the earlierseason.However Ψs and Ψl were good indicators of irrigation response during the end of the season.Higher variability was respectively found for Ψl and Ψs than ΨpThis was due to the environmental condition influences.In conclusion a higher number of leaves samples is necessary for Ψs and Ψl than Ψp
Lingua originaleUndefined/Unknown
Stato di pubblicazionePublished - 2005

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