Translocation of Amino-acids in Sugar Beet

Abstract

STUDIES of translocation have been largely concerned with movement of sugars or photosynthate, and investigations of transport of nitrogenous material have been limited. Organic nitrogen has been found in root exudates^1,2, but these consist of material transported in xylem. Analyses of phloem contents have revealed nitrogenous material³, but large samples are difficult to obtain. Indirect methods for investigation of phloem transport must often be used. An earlier report⁴ described specific movement of amino-acids from roots to young leaves in phloem. Further experiments on nitrogen movement are now reported.