Changes in 1-aminocyclopropane-1-carboxlate (ACC) oxidase expression and enzyme activity in response to excess manganese in white clover (Trifolium repens L.)

► Excess Mn resulted in decreased growth rate and leaf biomass in white clover. ► Changes in cell wall NADH peroxidase, but not guaiacol peroxidase in excess Mn. ► No change in ACO expression, but changes in ACO activity and abundance in excess Mn.