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应用十字花科蔬菜三属七种32个品种作为鉴定寄主,对京津地区12种十字花科蔬菜(大白菜、油青菜、芜菁、芥菜、大头青、雪里蕻、甘兰、苤兰、花椰菜、芥兰、萝卜和荠菜)上采集的34个霜霉病菌(Pronospora parasitica(Pers.)Fr.)标样进行了生理分化的研究。得到以下结果:1.大白菜,油青菜,芜菁上的病菌为一类,它们可以侵染全部或部分的这类寄主,呈感病反应,产生孢子囊;芥菜对不同病菌标样呈抗病或感病反应;不侵染荠菜、萝卜、甘兰类和雪里蕻,大头青。不同时间、地点和不同大白莱品种上采集的菌种有较大的致病性差异。2.芥菜、雪里蕻、大头青上的菌种,除芥菜上的可以侵染大白菜、油青菜和芜菁的若干品种外,它们只侵染芥菜属寄主。3.甘兰类(包括甘兰,苤兰,芥兰和花椰菜)上的菌种只侵染本类寄主,呈感病反应,产生孢子囊;不能侵染其他种属寄主。4.萝卜上有两类菌种:一类仅侵染萝卜一属的品种,不能侵染其他属的寄主,但也发现有一个标样除本寄主外,尚可接种在芸苔属的大白菜、甘兰和芥菜的一部分品种上。5.荠菜上的菌种只能侵染荠菜,呈感病反应,而不能侵染其他寄主。
Using cruciferous vegetables, three genera and seven species of 32 varieties as the identification host, 12 species of cruciferous vegetables (Chinese cabbage, oilseed cabbage, turnip, mustard, dazouqing, sesame, kale, kalanchoe, cauliflower 34 strains of Pronospora parasitica (Pers.) Fr.) Collected from the Chinese Academy of Sciences (CASS), kale, radish and shepherd’s purse. Obtained the following results: 1. Chinese cabbage, oil cabbage, turnip on a class of bacteria, they can infect all or part of this type of host, was susceptible reaction, resulting in sporangia; mustard on different bacteria standard anti- Disease or susceptible reactions; does not invade shepherd’s purse, radish, kalanchoe and snow lily, big head green. Different time, place and different strains of white cabbage collected strains have greater pathogenicity differences. 2. Mustard, snowy shrimp, big green on the species, in addition to mustard on the cabbage can be infected, cabbage and turnip variety, they only invade Arabidopsis host. 3. The kalanimys (including kalan, turnip, kale and cauliflower) on the species of bacteria only infects this host, a susceptible reaction, resulting in sporangia; can not infect other species host. There are two types of radish on the species: a class of only a genus of radish species, can not infect other hosts, but also found that there is a standard addition to the host, but can also be vaccinated in the large Cabbage, cabbage and mustard on the part of varieties. 5. Shepherd’s purse on the species can only infest shepherd’s purse, was susceptible reaction, but can not infect other hosts.