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<jats:title>Abstract</jats:title><jats:p>The effect of <jats:italic>in vitro</jats:italic> irradiations on ihe pelletability of peroxitlase activity was tested in extracts prepared from leaves of light‐grown spinach (<jats:italic>Spinacia oleracea</jats:italic>). It appeared that far red light increased the pelletable activity and that red light reversed this effect. This phytochrome‐mediated effect occurred in a particulate fraction which banded at 39% (w/w) sucrose on an isopycnic density gradient.</jats:p>