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The Mechanism of Phosphorus Uptake from Insoluble Phosphate by Citrus Plant with Mycorrhiza:Ⅰ. Effect of Phosphatase Activity on Phosphorus Uptake of Citrus Seedling with VA Mycorrhiza

Tang Zhengyao (Citrus Research Institute,Chinese Academy of Agrcultural Sciences) Hou Shoulin (Southwest Agricultural University)  
A pot experiment was carried out for trifoliate orange(Poncirus trifoliata) seedlings on sterilized red soil, which was amended with an insoluble P fertilizer—rock phosphate (RP) and a soluble P fertilizer—superphosphate (SP) at the same rate (160ppm) of total P, respectively. Three treatments were designed as follows: (1)Seedlings were inoculated with the Vesicular-arbuscular. mycorrhizal fungus (Glomns citricolum)in the soil applied RP; (2)Seedlings were inoculated as above in the soil applied SP; and (3) Seedlings were not inoculated in the soil applied RP as control. After four months, the percentage of myeorrhizal infection of seedlings was 14. 9% for the RP treatment, increasing 52. 0% compared with the SP treatment. Mycorrhizal colony could significantly stimulate citrus roots to excrete acid phosphatase in soil. Phosphatase activity. of the RP treatment was 29.8% up on that of the SP treatment. P content increased with increasing phosphatase activity, indicating mycorrhizal fungi can enhance P uptake from insoluble phosphate by citrus plant.
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