Interaction of phloem-translocated amino compounds with nitrate net uptake by the roots of beech (Fagus sylvatica) seedlings

Abstract

From these results it is concluded that phloem transport of amino compounds, especially of Gln and Asp, In the present study two experimental approaches from the shoot to the roots mediates regulation of were used to investigate the influence of changes in nitrate net uptake by the roots of beech trees in order the allocation of amino compounds in the phloem of to adapt this process to the nitrogen demand of the beech (Fagus sylvatica L.) seedlings on nitrate net whole plant. uptake by the roots. In a first set of experiments Gln or Asp were directly fed into the phloem of the epicotyl Key words: Amino compounds, phloem transport, nitrate via bark flaps. These compounds were previously net uptake, NH 3 fumigation, regulation, Gln, Asp, Arg. found to be allocated in the phloem of adult beech trees and were shown to inhibit nitrate net uptake