Summary
Distinctly different patterns of15N enrichment were observed in the nitrate and reduced-N fractions of xylem exudate from soybean plants during and after 5 to 6 days of exposure to15NO −3 . Within 1 d after changes in solution NO −3 label, more than 90% of the exudate NO −3 originated from the exogenous supply. Alterations in the enrichment of exudate reduced-N were much slower, however, and the enrichment reached only 40% even after 5 d of continuous exposure to15NO −3 . Taking into account possible reduction of endogenous NO −3 and delayed translocation of NO −3 reduction products, it was concluded that root reduction could have contributed only 30 to 42% of the reduced-N found in the exudate.
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Rufty, T.W., Volk, R.J. Alteration in enrichment of NO −3 and reduced-N in xylem exudate during and after extended plant exposure to15NO −3 . Plant Soil 91, 329–332 (1986). https://doi.org/10.1007/BF02198117
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DOI: https://doi.org/10.1007/BF02198117