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以美洲黑杨与青杨杂交三代谱系为材料，在室内外进行了美洲黑杨与青杨的杂交种对杨叶枯病抗性的研究。结果表明：亲本及Ｆ１、Ｆ２代在室内与室外及人工与自然发病表现较一致，美洲黑杨×青杨Ｆ２代抗性基因型分离比例均符合１∶２∶１，将Ｆ２代分离与感合作为感病，抗病株与感病株分离比例为１∶３，说明美洲黑杨对杨叶枯病的抗性是由一对纯合隐性等位基因控制。
Taking the three generations of hybrid between Populus tomentosa and Populus euphratica as materials, the resistance of Populus tomentosa to the blight was studied both indoors and outdoors. The results showed that the parents and the F1 and F2 generation in indoor and outdoor and artificial and natural disease performance is more consistent, the Populus × Populus × Poplar F2 generation resistant genotypes were isolated ratio of 1: 2: 1, F2 generation separation and flu The results showed that the resistance of poplar to poplar blight was controlled by a pair of homozygous recessive alleles.