The content of nitrogenous compounds in the xylem saps of nodulated and non-nodulated groundnuts was determined. Asparagine and aspartic acid were the main nitrogenous compounds in the xylem saps at the ripening stage of the nodulated groundnut cultivar (PI 259747), grown without nitrogen fertilization in a pot experiment. In contrast, under combined nitrogen available conditions such as nitrogen fertilization, nitrate was a major nitrogenous compound in the xylem saps followed by asparagine and aspartic acid. This phenomenon was particularly conspicuous at the ripening stage of the non-nodulated groundnut line (Nonnod). It was assumed that asparagine was the main transport form of the nitrogen fixed in the nodules of groundnut. The 4-methyleneglutamine compound was not detected or detected only in a trace amount in the xylem saps with an ion-chromatoanalyzer.
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