Growth Inhibition and Metabolite Pool Levels in Plant Tissues Fed d-Glucosamine and d-Galactose

摘要: The growth of corn (Zea mays) roots and barley (Hordeum vulgare) coleoptiles is sensitive to the presence external d-glucosamine d-galactose. In order investigate this effect, tissues were fed radioactive monosaccharides at concentrations that ranged from those strongly inhibitory had little influence on growth. At low concentrations, converted uridine diphosphate-N-acetyl-d-glucosamine, phosphate esters N-acetylglucosamine, free N-acetylglucosamine. As increased, pool levels each these metabolites rose several fold; and, in roots, two unidentified compounds, which not been detected previously, began accumulate tissues. major products d-galactose metabolism diphosphate-d-galactose 1-phosphate all tested. Both compounds showed a marked increase as galactose raised levels. experiments indicate efficient pathways exist plants for These pathways, however, do appear be under strict control, so unusually high amounts presumably interfere competitively with normal carbohydrate metabolism.