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RESEARCH PRODUCT
Water relations of two Sicilian grapevine cultivars in response to potassium availability and drought stress
Antonio MotisiLoredana AbbateElisabetta OddoFrancesco CarimiAndrea NardiniMaurizio SajevaSimone Inzerillosubject
0106 biological sciences0301 basic medicineIrrigationFertigationStomatal conductancehydraulic conductanceVitis vinifera LHydraulic conductancePhysiologyPotassiumDrought toleranceDrought stress; Hydraulic conductance; Potassium deficiency; Stomatal conductance; Vitis vinifera L.; Xylem sap; Plant Leaves; Plant Roots; Xylem; Droughts; Potassium; Vitis; Waterchemistry.chemical_elementPlant ScienceStomatal conductanceBiologyxylem sap01 natural sciencesPlant Roots03 medical and health sciencesPotassium deficiencyXylemVitis vinifera L.GeneticsSettore BIO/04 - Fisiologia VegetaleVitisCultivarXylem sapDroughtfungidrought stressXylemWaterfood and beveragesPlant RootVitiDroughtsPlant LeavesHorticulture030104 developmental biologychemistrypotassium deficiencystomatal conductanceSettore BIO/03 - Botanica Ambientale E ApplicataPotassiumPotassium deficiencyDrought strePlant Leave010606 plant biology & botanydescription
Abstract We investigated the response of two Sicilian grapevine cultivars, Catarratto and Nero d'Avola, to potassium deficiency and drought stress. Two-year-old plants grafted on 1103 Paulsen were grown in agriperlite, with or without potassium in the fertigation solution for six weeks, and subjected to moderate drought stress by suspending irrigation for one week. Potassium content of leaves, roots and xylem sap were measured with an ion-selective electrode. Changes in stomatal conductance, stem and leaf water potential and hydraulic conductance were compared between genotypes and treatments. Potassium deficiency led to significant decreases in leaf potassium content in both cultivars and under both well-watered and drought stress conditions. Potassium content in xylem sap showed no significant differences between cultivars and was correlated with stem hydraulic conductance, particularly in the drought stress treatments. Under drought stress conditions, potassium availability led to an increase in stomatal conductance, particularly in Nero d’Avola. Both cultivars showed a rather isohydric behavior under these experimental conditions, and the level of isohydry varied with potassium availability. These results can be useful for the development of optimal fertigation practices and the selection of drought tolerant varieties.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-01-01 |