Modifications des relations quantitatives entre les acides aminés libres et les pigments photosynthétiques chez différents mutants chlorophylliens d'Orge et d’Arabidopsis

Abstract

Photosynthetic pigments and free amino acids have been simultaneously determined in the leaves of barley and Arabidopsis, chlorophyll mutants and control plants, artificially grown under different physiological conditions. Several inverse-type relations (logarithmic, hyperbolic, or linear ones according to each case) have been determined between the concentrations of the photosynthetic pigments and those of some amino acids. The graphic plot of each of these relations is generally subdivided into two distinct curves, permitting the classification of biochemical effects due to mutations of different types and to physiological factors. The concentration of leucine undergoes large amplitude variations under dim light (400%) and, moreover, it presents specific relations with carotenoid pigments (β-carotene, lutein, violaxanthin, and neoxanthin).