禾顶囊壳小麦变种对草坪禾草的致病性研究

The pathogenicity of Chinese isolates of Gaeunannomyces graminis var. tritici to turf grasses

应用人工接种法测定了禾顶囊壳小麦变种中国菌系对草地早熟禾、多年生黑麦草、匍茎剪股颖、高羊茅、硬羊茅和狗牙根等 6种草坪禾草 2 4个品种的致病性。结果表明 ,该菌对供试各草种都能正常致病 ,引起典型全蚀病症状。大多数供试品种的病根率和病根严重度都很高 ,属于感病类型 ,仅匍茎剪股颖的绿宝石品种具有中度抗侵入性和高度抗侵染性 ,高羊茅Shorter品种和硬羊茅参试品种具有中度抗侵染性。由于该菌引起的小麦全蚀病在我国分布广泛 ,可以提供大量菌源侵染草坪禾草 。

Pathogenicity of Chinese isolates of Gaeumannomyces graminis var. tritici (Ggt)to 24 cultivars of 6 species of turf grass, Poa pratensis, Lolium perenne, Agrostis palustris,Festuca arundinacea,Festuca ovina var. duriuscula , and cynodondactylon , was evaluated by seedling inoculation. The results showed that all of the species of tested turf grass was infected by Ggt and expressed typical symptom of take all disease. The rate and severity of infected root in most of inoculated species and cultivars were very high. Exceptionally,cv.Green Diamond in Agrostis palustris showed moderate resistance to pathogen penetration and high resistance to pathogen colonization, and cv.Shorter of Festuca arundinacea and cv.YS 1 of Festuca ovina spp. duriuscula showed moderate resistance to pathogen colonization. Thus, Ggt was seriously imperilling turf establishment because of its wide distribution and mass production of inocula.