Effects of Leghaemoglobin Components on Nitrogen Fixation and Oxygen Consumption

Publisher Website
Google Scholar
Abstract
The effects of purified oxyleghaemoglobin components added to a suspension of bacteroids from soybean and pea root nodule prepared anaerobically were studied in terms of nitrogen fixation and oxygen consumption. Soybean leghaemoglobin components (Lb a and Lb c) and pea leghaemoglobin components (Lb I and Lb IV) have different O2-binding affinities. Lb a and Lb IV showed higher O2-binding affinities than Lb c and Lb I. When anaerobically prepared bacteroids were incubated with these leghaemoglobin components separately under low oxygen tension and in the presence of a reduction system, Lb a and Lb IV were more effective for both nitrogen fixation and oxygen consumption than Lb c and Lb I. These results suggest that leghaemoglobin components participate in more effective nitrogen fixation by controlling oxygen transport to bacteroids.

This publication has 1 reference indexed in Scilit: