Leghemoglobin content and stability and nitrogen fixing activity in lupine soybean and kidney bean root nodules

Zhiznevskaya, G.Ya; Kudryavtseva, N.N.; Genina, O.S.; Izmailov, S.F.

Fiziologiya Rastenii 37(2): 295-301


ISSN/ISBN: 0038-5719
Accession: 007509306

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The appearance of an electrophoretically slow component of leghemoglobin from soybean (Glycine max L.) and kidney-bean (Phaseolus vulgaris L.) root nodules coincided with the enhancement of nitrogen-fixing activity at the green bean phase. In lupin (Lupinus luteus L.) root nodules at the same growth phase the slow leghemoglobin component was in minor amount, and nitrogen-fixing activity was practically absent. The stability of leghemoglobin complexes with nicotinic acid, a natural ligand, was much higher in soybean and kidney-bean root nodules than was in lupin nodules. It is suggested that leghemoglobin destruction in lupin root nodules at the beginning of fruit production (the green bean formation phase) is one of the reasons for the absence of nitrogen-fixing activity in lupin.