Effect of trifluraline on nitrogen fixation efficiency of the nitrogen fixation system Br.rhr.japonicum_646-Glycine max(L.)Merril

摘要

The effect of trifluralien in concentraton of 2.1X10~-10 mol dm~-3 on the efficiency of nitrogen fixation and carbon losses during molecular nitrogen fixing has been studied.The data reveal an enhancement of nitrogen fixing proccess at reducedenergy cost (C/N) and decreased carbon losses.It has been found that the experimental plants treated withtrifluraline consumed 5.9 mgC/mg N_2 compared to 8.0 mgC/mgN_2 by the control plants.Br.rhz.japonicum_646 strain,used for inoculating the soybean plants,probably possessesan active hydrogen consuming hydroganase,which decreases the energy losses at the evolution of H_2 and CO_2 durign the respiration process in the nodules of the experimental plants.The studied on the efficiency of nitrogen fixation(RE) show an enhancement for the experimental plants (0.74) against 0.54 for the control ones.Simultaneously,the losses at hydrogen evolution decreases for the experimental plants (25.5%) compared with the control plants(45.2%).The electrophoretic pattern of Lb"a" and Lb"c" isoforms of the total Lb is changed,supposing more efficient oxygen supply of the bacteroids and increase in their functional activity.