Application of root zone feeding for evaluation of ion uptake and efflux in soybean genotypes

Abstract

Preliminary results are presented of experiments on the application of a root zone feeding technique to pursue the pathway of22Na+ and36Cl− in intact, differentially salt sensitive soybean varieties. In contrast to36Cl−, about 70% of the22Na+ taken up under saline conditions by the labelled apical 8 cm of the seminal root was released along the transport through the proximal root tissue into the ambient inactive nutrient solution. Additional investigations, including micro-autoradiography, are in progress to bring more light into the specific transport behaviour of the two ions.