Variation saisonnière des cristaux d'oxalate de calcium des tissus de Vigne vierge

Abstract

The occurrence of crystals of calcium oxalate increases with increasing growth rate of the Virginia creeper (Parthenocissus tricuspidata Planchon). They are not an end product of metabolism but can partly reenter in the metabolism especially when buds start in the spring. Radioactivity from [¹⁴C]oxalate supplied in situ is recovered in glycolate, glycine, serine, and glycerate, all intermediates of the glycolate pathway, whereas a small fraction is evolved as photorespiratory CO₂.