磷、铝胁迫对玉米幼苗生长和养分吸收的影响

选取5个基因型玉米品种，采用营养液培养，研究低磷和铝毒条件下不同基因型玉米苗期生长状况及对磷、钾、钙、镁、铁、锌的吸收。结果表明，耐低磷基因型玉米品种适应低磷的能力较强，具有较长的根系和较大的根干重，株高受低磷的影响明显小于敏感基因型玉米品种。低磷胁迫增大了植株的根冠比，改变了植株对营养元素的吸收及其地上部和根系的分配。铝胁迫下，铝敏感基因型玉米品种根伸长受到铝的抑制作用大于耐铝基因型玉米品种，各种营养元素的吸收累积明显受抑制，耐铝基因型玉米品种地上部和根系相对干重下降较少，而敏感基因型玉米品种相对干重显著下降。

Effects of Phosphorus Deficiency and Al toxicity on Growth and Nutrient Absorption of Maize Seedling

Five typical maize genotypes were used in this experiment to investigate the effects of phosphorus and aluminum stress on their growth and P, K, Ca, Mg, Fe, Zn uptake at seedling stage. The results showed that low-P tolerant maize genotypes had longer roots and larger dry root weight than low-P sensitive maize genotype, and the plant height of low-P tolerant maize genotypes were less affected by the phosphorus deficiency than that of sensitive genotypes. Under low phosphorus condition, the ratio of root to shoot in all genotypes increased, uptaking and distribution of P, K, Ca, Mg, Fe, Zn between roots and shoots also changed. Under stress of aluminum condition, accumulation of P, K, Ca, Mg, Fe, Zn was seriously affected, the root length and relative dry weigh of Al-tolerant maize genotypes were less affected by the Al toxicity than those of Al-sensitive genotypes.