Phosphorus supply enhances the response of legumes to elevated CO 2 (FACE) in a phosphorus-deficient vertisol
journal contributionposted on 05.01.2021, 04:57 by Jian Jin, Caixian Tang, Roger Armstrong, Peter Sale
Background & aims: Understanding the mechanism of how phosphorus (P) regulates the response of legumes to elevated CO 2 (eCO 2) is important for developing P management strategies to cope with increasing atmospheric CO 2 concentration. This study aimed to explore this mechanism by investigating interactive effects of CO 2 and P supply on root morphology, nodulation and soil P fractions in the rhizosphere. Methods: A column experiment was conducted under ambient (350 ppm) (aCO 2) and eCO 2 (550 ppm) in a free air CO 2 enrichment (FACE) system. Chickpea and field pea were grown in a P-deficient Vertisol with P addition of 0-16 mg P kg -1. Results: Increasing P supply increased plant growth and total P uptake with the increase being greater under eCO 2 than under aCO 2. Elevated CO 2 increased root biomass and length, on average, by 16 % and 14 %, respectively. Nodule biomass increased by 46 % in response to eCO 2 at 16 mg P kg -1, but was not affected by eCO 2 at no P supply. Total P uptake was correlated with root length while N uptake correlated with nodule number and biomass regardless of CO 2 level. Elevated CO 2 increased the NaOH-extractable organic P by 92 % when 16 mg P kg -1 was applied. Conclusion: The increase in P and N uptake and nodule number under eCO 2 resulted from the increased biomass production, rather than from changes in specific root-absorbing capability or specific nodule function. Elevated CO 2 appears to enhance P immobilization in the rhizosphere. © 2012 Springer Science+Business Media B.V.
We thank Dr. Clayton Butterly and anonymous reviewers for reviewing the manuscript. This research was supported by an Australian Research Council Linkage Project (LP100200757), and utilised the SOILFACE facilities at DPI Horsham which were developed with funding by the Victorian Department of Primary Industries (VDPI), the University of Melbourne (UM), the Grains Research and Development Corporation (GRDC), the Federal Department of Agriculture, Fisheries and Forestry (DAFF) and the Australian Greenhouse Office (AGO).
JournalPlant and Soil
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Science & TechnologyLife Sciences & BiomedicineAgronomyPlant SciencesSoil ScienceAgricultureFree air CO2 enrichmentFACEN-2 fixationNodulationP acquisitionP fractionsRhizosphereATMOSPHERIC CO2NITROGEN-FIXATIONCARBON-DIOXIDEGROWTH-RESPONSECALCAREOUS GRASSLANDPHOSPHATASE-ACTIVITYSOIL-MICROORGANISMSMICROBIAL BIOMASSNUTRIENT-UPTAKEPLANT-GROWTHAgronomy & Agriculture