University of Oxford, John Radcliffe Hospital 1 article published in JoVE Developmental Biology Geomagnetic Field (Gmf) and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression Cinzia M. Bertea1, Ravishankar Narayana1, Chiara Agliassa1, Christopher T. Rodgers2, Massimo E. Maffei1 1Department of Life Sciences and Systems Biology, University of Turin, 2Radcliffe Department of Medicine, University of Oxford, John Radcliffe Hospital This protocol describes a method to test the hypothesis that the reversal of the effective geomagnetic field (GMF) induces differential gene expression and alters the morphology of Arabidopsis thaliana. A triaxial octagonal system of Helmholtz coil-pairs was used to artificially generate reversed GMF conditions in the plant growth chamber.