中文摘要：

采用磷高效（181）和磷低效（197）两个玉米基因型研究了接种丛枝菌根（AM）真菌对玉米小斑病发生的影响。结果表明,玉米苗期的发病等级与地上部磷浓度呈极显著负相关,说明磷营养的改善是降低小斑病发病率的原因之一。在供磷不足（施磷量为20和50 mg/kg）时,两个玉米基因型小斑病发病率均最高,此时接种AM真菌显著提高了磷低效基因型197的地上部磷浓度、降低了其小斑病发病指数;而对磷高效基因型181接种AM真菌未显著提高地上部磷浓度,因而接种AM真菌对其小斑病的抗性影响不显著。以上结果表明,接种AM真菌能够提高玉米对小斑病的抗性,其机理与改善磷营养状况有关。

英文摘要：

Two maize genotypes,high phosphorous efficiency genotype（ND 181） and low phosphorous efficiency genotype（ND 197） were used to study the effects of inoculating AM fungi to the corn southern leaf bligh.The result shows that there is a significantly negative relationship between corn southern leaf bligh diease level and the shoot phosphorous concentration at the seedling stage of maize.This means that the improvement of phosphorous nutrition could lower the disease of corn southern leaf bligh.When the applications of P are at 20 and 50 mg/kg（under P deficiencies）,the disease incidences are highest.For the low P efficiency genotype,ND 197,the inoculating of AM fungi could improve the P nutrition,and the disease index of corn southern leaf bligh is lower.But for the high P efficiency genotype,ND 181,the inoculating of AM fungi could not improve the P nutrition,and the disease index of corn southern leaf bligh is not changed significantly.Through the above results,we could conclude that the inoculating of AM fungi could improve the resistance of maize to the disease of corn southern leaf bligh and the P nutrition.