Journalartikel
Autorenliste: Bauke, Sara L.; Schnepf, Andrea; von Sperber, Christian; Orlowski, Natalie; Lewandowski, Hans; Selzner, Tobias; Tamburini, Federica; Amelung, Wulf
Jahr der Veröffentlichung: 2021
Seiten: 1883-1895
Zeitschrift: New Phytologist
Bandnummer: 230
Heftnummer: 5
ISSN: 0028-646X
eISSN: 1469-8137
Open Access Status: Hybrid
DOI Link: https://doi.org/10.1111/nph.17307
Verlag: Wiley
Understanding P uptake in soil-plant systems requires suitable P tracers. The stable oxygen isotope ratio in phosphate (expressed as delta O-18(P)) is an alternative to radioactive labelling, but the degree to which plants preserve the delta O-18(P) value of the P source is unclear. We hypothesised that the source signal will be preserved in roots rather than shoots. In soil and hydroponic experiments with spring wheat (Triticum aestivum), we replaced irrigation water by O-18-labelled water for up to 10 d. We extracted plant inorganic phosphates with trichloroacetic acid (TCA), assessed temporal dynamics of delta O-18(TCA-P) values after changing to O-18-labelled water and combined the results with a mathematical model. Within 1 wk, full equilibration of delta O-18(TCA-P) values with the isotope value of the water in the growth medium occurred in shoots but not in roots. Model results further indicated that root delta O-18(TCA-P) values were affected by back transport of phosphate from shoots to roots, with a greater contribution of source P at higher temperatures when back transport was reduced. Root delta O-18(TCA-P) partially preserved the source signal, providing an indicator of P uptake sources. This now needs to be tested extensively for different species, soil and climate conditions to enable application in future ecosystem studies.
Abstract:
Zitierstile
Harvard-Zitierstil: Bauke, S., Schnepf, A., von Sperber, C., Orlowski, N., Lewandowski, H., Selzner, T., et al. (2021) Tracing uptake and translocation of phosphorus in wheat using oxygen isotopes and mathematical modelling, New Phytologist, 230(5), pp. 1883-1895. https://doi.org/10.1111/nph.17307
APA-Zitierstil: Bauke, S., Schnepf, A., von Sperber, C., Orlowski, N., Lewandowski, H., Selzner, T., Tamburini, F., & Amelung, W. (2021). Tracing uptake and translocation of phosphorus in wheat using oxygen isotopes and mathematical modelling. New Phytologist. 230(5), 1883-1895. https://doi.org/10.1111/nph.17307
Schlagwörter
CRYOGENIC WATER; DELTA-O-18; HYDROPONICS; isotope model; oxygen isotope exchange; plant P uptake; STABLE-ISOTOPE; WATER EXTRACTION
