Distribution and change in the contents of allantoin and allantoic acid in developing nodulating and non-nodulating soybean plants.
Allantoin and allantoic acid in tissues and stem exudates from field-grown soybean plants.
The possibility of differing catabolic enzymes for allantoic acid leading to differences in [N.sub.2] fixation sensitivity to water deficits opens the possibility of genotypic segregation based on ureide degradation characteristics.
Since allantoate amidinohydrolase activity might be associated with [N.sub.2] fixation tolerance to water deficit and response to Mn might be a key point of difference in discriminating between the enzymes for allantoic acid degradation, characterization of the eight tolerant PI lines identified by Sinclair et al.
Five weeks after transplanting, 5-mM allantoic acid (Sigma Chemical Co., St.
It has been reported that there are two pathways for the degradation of allantoic acid in soybean leaves.
At 5 wk after transplanting, plants grown at 0, 26.4, 52.8 [micro]M Mn, and half of the plants grown at 6.6 [micro]M Mn were treated by replacing the nutrient solution with 400 mL of nutrient solution containing 5 mM allantoic acid and the respective Mn concentrations.
The ARA for the individual plants treated with ureide were normalized against the mean ARA of those plants grown on 6.6 [micro]M Mn but not treated with allantoic acid. This normalization was done to eliminate variations resulting from changes in the greenhouse environment or plants during the experiment.