期刊
PLANT AND SOIL
卷 320, 期 1-2, 页码 91-102出版社
SPRINGER
DOI: 10.1007/s11104-008-9873-0
关键词
Low-P; Brassica napus L; P efficiency; Rhizosphere properties; P fractions
资金
- National Basic Research and Development Program [2005CB120905]
- National 863 High Technology Program [2006AA10A112]
- Specialized Research Fund for the Doctoral Program of Higher Education China [20050504009]
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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