GLUTAMINE METABOLISM OF THE BEET

Abstract

The glutamine content of the foot of the beet plant is rapidly increased by the application of (NH4)2SO4 in solution to the soil. A concn. as high as 5.4% of the dry weight of the tissue may be attained under favorable circumstances. The function of glutamine in this plant appears to be that of a detoxifying agent for ammonia, and both N atoms of the amide share in the reaction. The precursor of the glutamine is therefore obviously non-nitrogenous. Asparagin, although present, does not share in the role of detoxifying agent until the last stages of severe ammonia intoxication have been reached.