The relations of catalase activity to the efficiency of symbiotic dinitrogen fixation and leghemoglobin (Lb) content were investigated in roots and nodules of several legume plant species together with the catalase distribution between the inner bacteroidal and the outer cortical nodule tissues. The catalase activity in the nodules exceeded that of the roots of the amide- and ureide-synthesizing plant species by one and two orders of magnitude. During the growth period, catalase activity and Lb content changed in parallel and reached their highest levels early in the stage of flowering or fruit formation, depending on plant species. In the case of effective symbiosis, catalase activity in the nodules was 2.5–5 times higher than in the case of ineffective symbiosis. Catalase activity in the bacteroidal zone of the nodules was several times higher than that of the cortical tissue, and two nodule tissues differed in catalase activity more notably in the plant species exporting ureides. The authors suggest that high catalase activity in the nodules, especially in their bacteroidal zone, is essential for the efficient functioning of the symbiotic system of dinitrogen fixation in both ureide- and amide-transporting plants.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 8, 2004
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