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Media type:
E-Article
Title:
A Functional Relationship Between Leghaemoglobin and Nitrogenase Based on Novel Measurements of the Two Proteins in Legume Root Nodules
Contributor:
DAKORA, FELIX D.
imprint:
Academic Press, 1995
Published in:Annals of Botany
Language:
English
ISSN:
1095-8290;
0305-7364
Origination:
Footnote:
Description:
<p>A combination of physiological and structural measurements made on nodulated cowpea and soybean plants cultured with roots in different pO○ permitted the expression of data in various ways. Values of leghemoglobin concentration and nitrogenase activity from the two legumes were expressed conventionally either on a per plant or per gram nodule fresh weight basis, and where microscopy was done, on the basis of nitrogenase-containing, N○-fixing units (i.e. per bacteroid, per infected cell, or per gram infected tissue). In both legumes, acetylene reduction, N fixed and ureide content expressed on the basis of whole plants or per nitrogenase-containing units were very significantly correlated with values of leghaemoglobin concentrations expressed in a similar manner. The use of mathematical correlations in this study involving leghaemoglobin concentrations and various indices of N○ fixation indicated a strong functional relationship between the two proteins in symbiotic legumes. These findings confirm previous suggestions that leghaemoglobin and the nitrogenase complex are two proteins closely associated with N○-fixing efficiency in legume root nodules.</p>