Abstract
Higher specific activities of phosphoenolpyruvate carboxylase (PEPC), malate dehydrogenase (MDH) and alcohol dehydrogenase (ADH) were found in root nodule tissue than in root tissue from Pisum sativum plants, inoculated with Rhizobium leguminosarum. ADH from root nodule tissue possessed a higher affinity towards acetoaldehyde than ADH from root tissue. Dynamic changes in properties and specific activities of these enzymes could be demonstrated in root tissue by restriction of aeration. Accumulation of malic acid, the first stable product of CO 2 dark fixation, resulting in a considerable concentration of L-malate in root nodules and the rapid uptake of C 4-dicarboxylic acids by isolated bacteroids are discussed in relation to the energy demand of R. leguminosarum during nitrogen fixation in symbiosis.
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