【摘要】 利用盆栽土培和营养液培养的方法,研究了甘蓝型油菜磷高效品种97081和磷低效品种97009在正常磷和低磷胁迫下幼苗植株生长、磷的吸收累积、植物磷组分以及酸性磷酸酶活性的差异。结果表明,缺磷条件下,97081品种的干物质重和磷累积量分别比97009高85.7%和50.0%,并且单位磷含量可以生产较多的干物质,具有较强的磷的吸收和利用效率。两品种中不可溶性有机磷、可溶性有机磷和无机磷含量都随着营养液磷水平的增加而提高。低磷胁迫时,根部不可溶性有机磷含量97009显著下降。两品种可溶性有机磷占总磷的比例均表现为下部叶>上部叶;97081根和下部叶可溶性有机磷含量及其比例均高于97009。97081根部无机磷含量高于97009,但其所占全磷比例却较低。缺磷处理,上部叶酸性磷酸酶(APase)活性两品种无显著差异;但根中和下部叶APase活性97081显著高于97009。这与甘蓝型油菜高效品种具有较强的磷吸收和再利用能力密切相关。更多还原

【Abstract】 Rapeseed(Brassica napus) needs enough phosphorous(P) in its early growth stage and thus is very sensitive to P deficiency.Two genotypes of rapeseed,i.e.,a P-efficient cv.97081,and a P-inefficient cv.97009,were used to study the growth,P uptake and utilization,plant P fractions and the activity of acid phosphatase(APase) under normal and low P nutrient status using soil pot and hydroponic experiments.The results showed that cv.97081 possessed high effiency of P uptake and utilization since its dry biomass and P accumulation increased by 85.7% and 50.0%,respectively,in comparison with cv.97009 under P deficient condition.In both rape cultivars,all the P fractions,including insoluble organic P,soluble organic P and inorganic P,increased with P levels in the medium.Low P stress reduced the concentrations of insoluble organic P in the roots of cv.97009,but not cv.97081.The ratio of soluble organic P(ester-P) in total P was higher in bottom leaves than upper leaves.Both the concentration and ratio of ester-P of cv.97081 were higher than that of cv.97009.The concentration of inorganic P in the roots of cv.97081 was higher than that of cv.97009;however,the ratio was much lower compared with cv.97009.P-efficent cv. 97081 had greater activity of APase in roots and bottom leaves under low P stress than P-inefficient cv.97009 although there was no significant difference in upper leaves between the two cultivars.The results suggested that the concentrations and distributions of P fractions and the activity of APase were closely related to P uptake and utilization efficiency of Brassica napus.更多还原