Effects of phosphorus and drought stresses on dry matter and phosphorus allocation in wheat |
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Authors: | D Rodriguez J Goudriaan |
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Institution: | 1. Cátedra de Fertilidad y Fertilizantes, Facultad de Agronomia , Universidad de Buenos Aíres , Av. San Martín 4453, 1417, Argentina;2. Cátedra de Fertilidad y Fertilizantes, Facultad de Agronomia , Universidad de Buenos Aíres , Av. San Martín 4453, 1417, Argentina;3. Dto. Theoretical Production Ecology , PO Box 430, Wageningen, 6700, The Netherlands |
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Abstract: | The effect of phosphorus (P) and soil water availability (W) on the growth and development of wheat plants (Triticum aestivum L. cv. Minaret) was studied in a pot experiment. Four levels of P supply (0, 15, 30, and 100 μgP/g soil) were applied before sowing. Thirty‐four days after sowing (DAS), the pots were kept near 100% of field capacity (FC). From 34 DAS until one week before anthesis (67 DAS), half of the pots were maintained between 60–70% FC. Control pots were kept at 85–95% FC by weighing and watering the pots every two to three days. Shoots were harvested four times before anthesis and twice after. At each harvest, dry matter and P accumulation were measured in leaves, stems, and ears. In this study, thermal time until anthesis was inversely related to the level of P application. Phosphorus additioning affected the allocation of biomass and P in aerial plant organs. Plants growing only with soil P showed a delay in the allocation of dry matter and P into leaves and stems with respect to plants fertilized with 100 μg P/g of soil. In this study, the final composition of the grain depended on re‐mobilization from other plant organs. Evidence of independent re‐mobilization of carbohydrates and P towards the ear is presented, and the pattern of plant development as well as the relationships between development and dry matter and P allocation are discussed. |
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