Abstract
Genotypic differences in acquiring immobile P exist among species or cultivars within one species. We investigated the P-efficiency mechanisms of rapeseed (Brassica napus L.) in low P soil by measuring plant growth, P acquisition and rhizosphere properties. Two genotypes with different P efficiencies were grown in a root-compartment experiment under low P (P15: 15 mg P kg−1) and high P (P100: 100 mg P kg−1) treatments. The P-efficient genotype produced more biomass, and had a high seed yield and high P acquisition efficiency under low P treatment. Under both P treatments, both genotypes decreased inorganic P (Pi) and organic P (Po) fractions in the rhizosphere soil. However there was no decrease in NaHCO3-Po at P100. For the P15 treatment, the concentrations of NaHCO3-Po and NaOH-Po were negatively correlated with soil acid phosphatase activity. The P-efficient genotype 102 differed from the P-inefficient genotype 105 in the following ways. In the rhizosphere the soil pH was lower, acid phosphatase activity was higher, and depletion of P was greater. Further the depletion zones were wider. These results suggested that improving P efficiency based on the character of P efficiency acquisition in P-efficient genotype would be a potential approach for maintaining rapeseed yield potential in soils with low P bioavailability.
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This work was supported by grants from the National Basic Research and Development Program (2005CB120905), National 863 High Technology Program (2006AA10A112), and Specialized Research Fund for the Doctoral Program of Higher Education (20050504009), China.
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Zhang, H., Huang, Y., Ye, X. et al. Genotypic differences in phosphorus acquisition and the rhizosphere properties of Brassica napus in response to low phosphorus stress. Plant Soil 320, 91–102 (2009). https://doi.org/10.1007/s11104-008-9873-0
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DOI: https://doi.org/10.1007/s11104-008-9873-0