Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.soilbio.2021.108497 |
Licence  |
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| Title (Primary) | Co-localised phosphorus mobilization processes in the rhizosphere of field-grown maize jointly contribute to plant nutrition |
| Author | Bilyera, N.; Hummel, C.; Daudin, G.; Santangeli, M.; Zhang, X.; Santner, J.; Lippold, E.
; Schlüter, S.; Bertrand, I.; Wenzel, W.; Spielvogel, S.; Vetterlein, D.; Razavi, B.S.; Oburger, E. |
| Source Titel | Soil Biology & Biochemistry |
| Year | 2022 |
| Department | BOSYS |
| Volume | 165 |
| Page From | art. 108497 |
| Language | englisch |
| Topic | T5 Future Landscapes |
| Supplements | Supplement 1 |
| Keywords | Diffusive gradients in thin films (DGT); Planar pH optodes; Root hairs; Root window; Soil texture; Soil zymography |
| Abstract | Understanding
phosphorus (P) dynamics in the rhizosphere is crucial for sustainable crop
production. P mobilization processes in the rhizosphere include the release of
plant and microbially-derived protons and extracellular phosphatases. We
investigated the effect of root hairs and soil texture on the spatial
distribution and intensity of P mobilizing processes in the rhizosphere of Zea
mays L. root-hair defective mutant (rth3) and wild-type (WT) grown in two
substrates (loam, sand). We applied 2D-chemical imaging methods in
custom-designed root windows installed in the field to visualize soil pH
(optodes), acid phosphatase activity (zymography), and labile P and Mn fluxes
(diffusive gradients in thin films, DGT). The average rhizosphere extent for phosphatase activity and pH was greater in sand than in loam, while the presence of root-hairs had no impact. Acidification was significantly stronger at young root tissue (<2 cm from root cap) than at older root segments (>4 cm from root cap) and stronger in WT than rth3. Accompanied with stronger acidification, higher P flux was observed mainly around young, actively growing root tissues for both genotypes. Our results indicate that acidification was linked to root growth and created a pH optimum for acid phosphatase activity, i.e., mineralization of organic P, especially at young root tissues which are major sites of P uptake. Both genotypes grew better in loam than in sand; however, the presence of root hairs generally resulted in higher shoot P concentrations and greater shoot biomass of WT compared to rth3. We conclude that soil substrate had a larger impact on the extent and intensity of P solubilization processes in the rhizosphere of maize than the presence of root hairs. For the first time, we combined 2D-imaging of soil pH, phosphatase activity, and nutrient gradients in the field and demonstrated a novel approach of stepwise data integration revealing the interplay of various P solubilizing processes in situ. |
| Bilyera, N., Hummel, C., Daudin, G., Santangeli, M., Zhang, X., Santner, J., Lippold, E., Schlüter, S., Bertrand, I., Wenzel, W., Spielvogel, S., Vetterlein, D., Razavi, B.S., Oburger, E. (2022): Co-localised phosphorus mobilization processes in the rhizosphere of field-grown maize jointly contribute to plant nutrition Soil Biol. Biochem. 165 , art. 108497 10.1016/j.soilbio.2021.108497 |
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