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Partial root zone drying exerts different physiological responses on field-grown grapevine (Vitis vinifera cv. Monastrell) in comparison to regulated deficit irrigation

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  • Pascual Romero
  • Juan Gabriel Perez-Perez
  • Francisco M. del Amor
  • Adrian Martinez-Cutillas
  • Ian C. Dodd
  • Pablo Botia
<mark>Journal publication date</mark>3/04/2014
<mark>Journal</mark>Functional Plant Biology
Issue number10-11
Number of pages20
Pages (from-to)1087-1106
Publication StatusPublished
<mark>Original language</mark>English


Regulated deficit irrigation (RDI) and partial root zone irrigation (PRI) were compared for 4 years at two irrigation volumes (110 mm year(-1) (1) and 78 mm year(-1) (2)) in field-grown grafted Monastrell grapevines (Vitis vitifera L.) to distinguish the effects of deficit irrigation from specific PRI effects. PRI-1 and RDI-1 vines received similar to 30% of the crop evapotranspiration (ETc) from budburst to fruit set, 13-15% from fruit set to veraison and 20% from veraison to harvest. RDI-2 and PRI-2 vines received around 20% of ETc from budburst to fruit set, no irrigation from fruit set to veraison, and recovery (21-24% ETc) thereafter. Compared with RDI-1, PRI-1 increased irrigation depth and total soil water (theta(v)) availability in the root zone, and stimulated greater fine root growth and water uptake. Increased soil volume exploration supported greater canopy water use, vegetative development, biomass accumulation and internal water storage capacity. PRI-1 vines had higher stomatal conductance, lower leaf-level water use efficiency and increased leaf xylem sap concentration ([X-ABA](leaf)) following reirrigation. Compared with RDI-2, PRI-2 decreased total theta(v) availability, fine root growth and water uptake, gas exchange, leaf water status, [X-ABA](leaf), biomass accumulation and storage capacity. Xylem ABA decreased with total theta(v) availability in PRI-2, probably from limited sap flow when theta(v) in drying soil was low (approximate to 20%). For this rootstock-scion combination, high irrigation volumes applied to the wet part of the roots (theta(v) > 30%) are critical for increasing root-to-shoot ABA signalling and growth, and improving performance under semiarid conditions.