K deficiency increases the net production of several oxylipins. Oxylipin concentrations in shoots of control and K-deficient plants. Plants were grown from germination for 2 weeks on vertical Petri dishes in control (black) or K-free medium (white). Averages (± SE) of oxylipin concentrations from three independent experiments are shown. In each experiment oxylipins were extracted from shoot tissue pooled from approx. 75 plants, and analysed by LC-MS. Stars indicate significant differences between control and K-starved plants at p < 0.05 (*) or p < 0.01 (**) as determined by t-test. JA: Jasmonic acid; OPDA: 12-oxo-phytodienoic acid; 9-HOD: 9-hydroxy-12-oxo-octadecadienoic acid; 13-HOD: 13-hydroxy-12-oxo-octadecadienoic acid.