Abstract
Soluble chlorophyllase preparations were made from sugar-beet leaves, which have the highest activity of all species tested. For the partly purified enzyme the optimum conditions for enzyme action are pH 7.7 at 25[degree] and an acetone concentration of 40%. When dark-grown pea seedlings with very low chlorophyllase activity were transferred to daylight the activity rose in 48 hours to a level comparable with that of light-grown seedlings.