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Impact of Irrigation Strategies on Abscisic Acid and its Catabolites Profiles in Leaves and Berries of Baco noir Grapes
- Balint, Gabriel, Reynolds, Andrew G.
- Journal of plant growth regulation 2013 v.32 no.4 pp. 884-900
- Vitis riparia, abscisic acid, climatic factors, glucose, ion exchange chromatography, irrigation management, leaves, liquid chromatography, metabolites, oxidation, phaseic acid, plant physiology, small fruits, soil, spectroscopy, vineyards, wine grapes, Canada
- To understand the relationship among soil and plant water status, plant physiology, and the hormonal profiles associated with it, abscisic acid (ABA) and its catabolites [phaseic acid (PA), dihydrophaseic acid (DPA), 7-hydroxy-ABA, 8′-hydroxy-ABA, neophaseic acid, and abscisic acid glucose ester (ABA-GE)] in leaves and berries from wine grape cultivar Baco noir (Folle blanche × Vitis riparia) were analyzed. The experiment was conducted during the growing seasons 2006 and 2007 in an irrigation trial set up in a commercial vineyard located in Niagara-on-the-Lake, ON, Canada. ABA and its metabolites were quantified using liquid chromatography with ion trap combined with electrospray ionization-mass spectrometry. The hormonal profile indicated a direct relationship between the amount of ABA and climatic factors. The ABA varied between 582 and 4,026 ng g⁻¹ dry matter (DM), DPA between 417 and 562 ng g⁻¹, and ABA-GE between 337 and 2,764 ng g⁻¹ DM. At many sampling times PA in the leaves was undetectable, and its highest concentration (260 ng g⁻¹ DM) was at beginning of July 2007. ABA followed different catabolic pathways depending on the plant water status. ABA was likely catabolized by conjugation to form ABA-GE in treatments at higher water deficit levels, whereas in treatments with high water status, the oxidation pathway leading to DPA or PA was likely preferred. The ABA and ABA-GE concentrations in the berries at harvest showed high correlation with soil and plant water status.