Articles
Vegetative and physiological response of young Vitis vinifera (‘Pinotage’) vines grafted on 110 Richter and US-8-7 rootstocks under dryland and fully irrigated conditions
Article number
1409_63
Pages
501 – 209
Language
English
Abstract
To have more sustainable viticulture systems it is crucial to understand if the current genetic material available can handle more demanding climatic conditions.
For this reason, an exploratory pilot experiment was performed to study the vegetative and physiological response of young vines (‘Pinotage’) grafted on 110 Richter and US-8-7 rootstocks under dryland and fully irrigated conditions.
The experiment was conducted in an irrigation block, designed to study the long-term effects of water deficit on different cultivars and rootstock combinations at Stellenbosch University.
Five replicates of each of the different scion/rootstock combinations underwent a fully irrigated and dryland trial.
Lateral leaf area (LLA) measured using image analysis was used as an indicator of vegetative growth and midday stem water potential (SWP) was used as a physiological indicator of water stress.
A broad range of SWP measurements, from -0.54 to -1.37 MPa, was observed during the peak of the season (February), but no significant differences were observed between the irrigation levels, due to high variability among the replicates.
Large variability in SWP was observed despite a relatively lower variability in the soil water content (SWC). In the case of vegetative growth, LLA measurements for the vines grafted on US-8-7 had a similar range for both the irrigated and dryland vines, however, vines grafted on 110 Richter had a significant difference between the fully irrigated (average value of 1.21 m2) and dryland (average value of 0.96 m2). Overall, a large variation within replicates was observed, leading to a broad overlap between the measurements regardless of rootstock and irrigation regime.
For this reason, an exploratory pilot experiment was performed to study the vegetative and physiological response of young vines (‘Pinotage’) grafted on 110 Richter and US-8-7 rootstocks under dryland and fully irrigated conditions.
The experiment was conducted in an irrigation block, designed to study the long-term effects of water deficit on different cultivars and rootstock combinations at Stellenbosch University.
Five replicates of each of the different scion/rootstock combinations underwent a fully irrigated and dryland trial.
Lateral leaf area (LLA) measured using image analysis was used as an indicator of vegetative growth and midday stem water potential (SWP) was used as a physiological indicator of water stress.
A broad range of SWP measurements, from -0.54 to -1.37 MPa, was observed during the peak of the season (February), but no significant differences were observed between the irrigation levels, due to high variability among the replicates.
Large variability in SWP was observed despite a relatively lower variability in the soil water content (SWC). In the case of vegetative growth, LLA measurements for the vines grafted on US-8-7 had a similar range for both the irrigated and dryland vines, however, vines grafted on 110 Richter had a significant difference between the fully irrigated (average value of 1.21 m2) and dryland (average value of 0.96 m2). Overall, a large variation within replicates was observed, leading to a broad overlap between the measurements regardless of rootstock and irrigation regime.
Authors
R. Swart, M.A. Vivier, C. Poblete-Echeverría
Keywords
climate change, dryland, experimental vineyard, ‘Pinotage’, stem water potential
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