Action de la lumiére sur les peroxydases et sur la teneur en composés phénoliques de tissus de feuilles deCichorium intybus L. cultivés in vitro

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Abstract
Three days” illumination of tissues cultured previously in darkness decreases their peroxidase activity and increases their content in phenolic compounds; conversely, when tissues cultured under continuous illumination are placed in darkness for three days, their peroxidase activity increases and their content in phenolic compounds decreases. There is an inverse relationship between the quantity of phenol compound and peroxidase activity. The isoperoxidase pattern is the same in both illuminated and not illuminated tissues.