论文部分内容阅读
用从陕西秦巴山区西洋参病组织及参床周围生境中分离到的9种链格孢(Alter—naria spp.)接种西洋参叶片,除人参链格孢(A.panax)之外,其它均不能致病。从该地区采集的人参链格孢分离系,较Simmons(1982)根据模式标本描述者,成熟分生孢子的尺度明显偏大。且菌系之间,在形态上有一定分化,大致可分为两组。Ⅰ组菌系分生孢子较粗,Ⅱ组则较为窄细,喙部也较长。田间越冬死茎桩及病残体,是当地西洋参黑斑病的主要初侵染来源。土壤中的病菌也能正常越冬.文中对人参链格孢分类的历史和现状进行了讨论。
Nine kinds of Alter-naria spp. Isolated from the American ginseng in Qinba Mountain area of Shaanxi Province and the habitats around the ginseng bed were used to inoculate American ginseng leaves except A.panax, Pathogenic. Isolates of Alternaria solani collected from this area were significantly larger than those of Simmons (1982) according to the description of the model specimens. And between strains, there are some morphological differentiation, can be divided into two groups. Group Ⅰ strains of conidia coarse, group Ⅱ is more narrow, beak is also longer. Field overwintering dead stump and disease residues, is the local primary ginseng black spot primary infection source. The bacteria in the soil can also overwinter normally. The history and current status of the genus Alternaria alternata was discussed in this paper.