Fissazione Dell'Anidride Carbonica Da Parte Di « Cuscuta Epithymum »

Publisher Website
Google Scholar
Abstract
CO 2 fixation by CUSCUTA EPITHYMUM. — Seedlings of Cuscuta epithymum or filaments detached from the host (Trifolium repens) fix carbon dioxide by mechanism(s) which are, though to a different extent, stimulated by light. Chromatographic analysis of plant extracts that have assimilated C14O2 indicates that, in all cases, the radioactivity is detectable in the areas corresponding to the organic acids and the acidic amino acids. No labelling was associated in appreciable amounts with 3-pho-sphoglycerate and the mono- and diphosphate esters of hexoses and pentoses. Such results are substantiated by the finding that cell-free extracts of seedlings and filaments fix carbon dioxide by carboxylating phosphoenolpyruvic acid. It is concluded that, under the experimental conditions, malic enzyme, pyruvate carboxylase and ribulose-1,5-diphosphate carboxylase have little, if any, significance in the fixation of carbon dioxide by the tested species of Cuscuta.

This publication has 1 reference indexed in Scilit: