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Elevated CO2 Improves Growth and Phosphorus Utilization Efficiency in Cereal Species Under Sub-Optimal Phosphorus Supply

Pandey, Renu, Dubey, Krishna Kant, Ahmad, Altaf, Nilofar, Rakshanda, Verma, Rachana, Jain, Vanita, Zinta, Gaurav, Kumar, Vikas
Journal of plant nutrition 2015 v.38 no.8 pp. 1196-1217
Secale cereale, Triticum aestivum, carbon dioxide, cultivars, dry matter accumulation, durum wheat, leaf area, phosphorus, surface area
Cultivars of Triticum aestivum , T. durum , and Secale cereale were grown at low (2 μM) and sufficient (500 μM) phosphorus (P) under ambient carbon dioxide (380 μmol mol ⁻¹; aCO ₂) and elevated CO ₂ (700 μmol mol ⁻¹, eCO ₂) to study responses of cereal species in terms of growth and P utilization efficiency (PUE) under P x CO ₂ interaction. Dry matter accumulation increased under eCO ₂ with sufficient P. Nevertheless, dry matter accumulated at eCO ₂ with low-P was similar to that obtained at aCO ₂ with sufficient P. Leaf area was 43% higher under eCO ₂ with sufficient P. Significant increase in lateral root density, length and surface area were noted at low-P under eCO ₂. Phosphorus use efficience (PUE) increased by 59% in response to eCO ₂­ in low-P plants. Thus, eCO ₂ can partly compensate effect of low-P supply because of improved utilization efficiency. Among cereals, durum wheat was more suitable in terms of PUE under high CO ₂ and limiting P supply.