Elevated CO2 promotes the acquisition of phosphorus in crop species differing in physiological phosphorus-acquiring mechanisms

• Published in: Plant and soil Vol. 455; no. 1-2; pp. 397 - 408
• Main Authors: O’Sullivan, James B., Jin, Jian, Tang, Caixian
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.10.2020; Springer Nature B.V
• Subjects: Beans; Biomedical and Life Sciences; Broad beans; Canola; Carbon dioxide; carbon dioxide enrichment; citrates; Citric acid; Crops; Depletion; Ecology; Efflux; Exudation; faba beans; Life Sciences; Lupinus; Organic acids; Phosphorus; Plant Physiology; Plant Sciences; Regular Article; Rhizosphere; Sodium hydroxide; soil; Soil investigations; Soil Science & Conservation; Soils; Species; Wheat; Climate change; Legumes; Organic anions; Phosphatases; Root exudation; High carbon dioxide
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/s11104-020-04698-8

Background and aims Crop species differ in phosphorus (P) acquisition in P-limiting environments. However, it is not fully understood how elevated atmospheric CO 2 concentrations affects these P acquisition mechanisms and the plant's ability to acquire P from soil. This study aimed to investigate the effect of elevated CO 2 on P acquisition in crop species with contrasting P acquisition mechanisms. Methods White lupin, faba bean, canola and near-isogenic wheat lines with and without citrate efflux were grown for 70 days in a P-deficient Chromosol soil under ambient (400 ppm) and elevated (800 ppm) CO 2 . Plant P uptake and P transformation in the rhizosphere were determined. Results Elevated CO 2 promoted total P uptake in white lupin and canola by 84% and 48%, respectively, and decreased the P uptake in the non-citrate-exuding wheat (by 24%) but not the exuding wheat. In white lupin, elevated CO 2 enhanced phosphatase activity and depletion of organic P in the rhizosphere. Elevated CO 2 increased P uptake by increasing root length which allowed canola to exploit a greater volume of soil for P. In the rhizosphere of faba bean, NaOH-extractable inorganic P was greater under elevated CO 2 . Conclusion Crops which rely on organic acid exudation and phosphatases appear to be better adapted to acquiring P under elevated CO 2 .