Changes in Salix viminalis L. cv. 'Cannabina' morphology and physiology in response to nickel ions - Hydroponic investigations

► Nickel was accumulated mainly in Salix viminalis L. roots and rod. ► Salix biomass parameters decreased significantly for subsequent Ni concentrations. ► Soluble carbohydrates content in Salix leaves increased in Ni-treated plants. ► Composition and content of low molecular weight organic acids in Salix rhizosphere changed in relation to Ni level. ► Phenolics and soluble carbohydrates probably regulate the exudation of low molecular weight organic acids by Salix roots.