Elevated CO2 Improves Growth and Phosphorus Utilization Efficiency in Cereal Species Under Sub-Optimal Phosphorus Supply |
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| Authors: | Renu Pandey Krishna Kant Dubey Altaf Ahmad Rakshanda Nilofar Rachana Verma Vanita Jain |
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| Affiliation: | 1. Mineral Nutrition Lab, Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India renu_iari@rediffmail.com;3. Mineral Nutrition Lab, Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi, India;4. Department of Botany, Aligarh Muslim University, Aligarh, India |
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| Abstract: | 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; aCO2) and elevated CO2 (700 μmol mol?1, eCO2) to study responses of cereal species in terms of growth and P utilization efficiency (PUE) under P x CO2 interaction. Dry matter accumulation increased under eCO2 with sufficient P. Nevertheless, dry matter accumulated at eCO2 with low-P was similar to that obtained at aCO2 with sufficient P. Leaf area was 43% higher under eCO2 with sufficient P. Significant increase in lateral root density, length and surface area were noted at low-P under eCO2. Phosphorus use efficience (PUE) increased by 59% in response to eCO2 in low-P plants. Thus, eCO2 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 CO2 and limiting P supply. |
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| Keywords: | elevated CO2 phosphorus nutrition utilization efficiency Secale cereale Triticum aestivum Triticum durum |
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