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Nitrogen fixation in relation to dark carbon di oxide fixation in developing nodules of arachis hypogaea cultivar spanish improved mutants



Nitrogen fixation in relation to dark carbon di oxide fixation in developing nodules of arachis hypogaea cultivar spanish improved mutants



Indian Journal of Experimental Biology 21(11): 629-632



N fixation in relation to in vivo and in vitro dark CO2 fixation by nodules was studied in groundnut (A. hypogaea L.) mutants TG-1 and TG-16 and their parent 'Spanish Improved' at different stages of growth. The relative efficiency, which measures the efficiency of H2 recycling, was high (> 0.9) and comparable in all the 3 varieties. Higher N fixation capacity as judged by acetylene reduction and higher CO2 fixation capacity of nodules from the mutants TG-1 and TG-16 were attributed mainly to higher nodule mass. Nitrogenase activity was correlated neither with in vivo dark CO2 fixation rate of nodules as judged by 14C-labeled CO2-fixation, nor with in vitro PEP [phosphoenolpyruvate] carboxylase activity of nodule cytosol. Dark CO2 fixation by nodules may have a greater supplementary role in C assimilation for supporting N2-fixation during initial stages of pod filling.

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