Utilization of organic phosphorus sources by oilseed rape,sunflower, and soybean |
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| Authors: | Hernan Belinque Norma Pucheu Norma Kerber Gerardo Rubio |
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| Institution: | 1. INBA, Research Institute of Agricultural and Environmental Biosciences, University of Buenos Aires, Comisión Nacional de Investigaciones Científicas y Técnicas, C1417DSE Buenos Aires, Argentina;2. Soil Fertility Lab, School of Agriculture, University of Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina |
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| Abstract: | We evaluated the ability of Brassica napus L. (oilseed rape), Helianthus annus L. (sunflower), and Glycine max L. (soybean) plants grown inoculated with or without bacteria to utilize organic P sources. Plants were supplied with inorganic (dibasic sodium phosphate) and organic P sources (phytate and glucose phosphate) at three concentrations and grown for 40 d under sterile conditions. Three inoculation treatments were compared: control (non‐inoculated plants), inoculation with Bacillus amyloliquefaciens BNM340, and inoculation with Pseudomonas fluorescens BNM296 (two bacteria with proven phytase activity). Oilseed rape, sunflower and soybean could utilize organic P sources. For example, when phytate (0.5 mM) P was used as the external P source, the increase factors over the no‐P treatments were 4.5, 1.4, and 1.4 for oilseed rape, sunflower, and soybean P uptake, respectively. When glucose 1‐phosphate disodium salt (G1P, 0.5 mM) was the P source, the increase factors were 8.8, 1.7, and 1.9 respectively. Positive responses to the organic P sources were found for the biomass accumulation of oilseed rape and soybean but not for sunflower. The inoculation with bacteria did not exert a promoting effect on P uptake. We demonstrate that the three species can effectively use organic P sources. The existence of crop plants that are more efficient in the utilization of different soil P sources would be particularly beneficial to improve P recycling and use of P fertilizers in agriculture. |
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| Keywords: | Brassica napus Glycine max Helianthus annuus phosphorus acquisition phytate |
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