磷水平对不同基因型玉米苗期磷吸收利用的影响

Effect of phosphorus level on phosphorus absorption and utilization of different genotype maize seedlings

以齐319(对照)和来源于齐319的耐低磷突变体99037和99106为材料,在1μmol/L和1000μmol/L KH2PO4两个磷水平下,通过水培实验研究了磷水平对不同基因型玉米磷吸收、利用和酸性磷酸酶活性的影响。结果表明,低磷条件下三个自交系的根冠比均显著增加,植株磷含量明显降低,生物量显著减小,磷利用效率和酸性磷酸酶活性大大提高。但不同基因型间存在显著差异,自交系99037与齐319相比具有植株磷浓度低、磷素再利用能力强、磷利用效率和净吸收量高等特征,是自交系99037磷高效的可能机理。

The effect of phosphorus （P） level on P absorption, utilization and acid phosphatase （APase） activity was studied using hydroponic maize seedlings of original line Qi319 （control） and low-P tolerance lines 99037 and 99106, obtained from cell engineering technology, under 1 μmol/L or 1000 μmol/L KH2PO4. The results showed that under P-stress environment the root-shoot ratio, P-use efficiency and APase activity of seedlings from three inbred lines increased significantly, and P content and biomass decreased obviously, but there were still significant differences among the three maize genotypes. 99037 had lower P concentration and higher P-reuse ability, P-use efficiency and net P-accumulation, compared with Qi319, which may be the primary factors leading to higher low-P tolerance of 99037.