| 摘要: |
| 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。 |
| 关键词: 秦巴山区,西洋参,黑斑病,病原形态,初侵染来源,人参链格孢 |
| DOI： |
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| Pathogen Morphology and Primary Infection Sources of Alternaria Blight of Panax quinquefolium in Qinling Bashan Mountain Area in Sonthern Shaanxi |
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Zhang Tianyu Bai Bin Chen Weiqun
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| Abstract: |
| Inoculations indicatod that among 9 Alternaria spp.isolated
from Panax quinquefolium and ginseng fields in Qinling,Bashan mountain area
in southern Shaanxi,only A. panax Whetzol caused early blight of American
ginseng.The mature conidia (on natural substarte) of the isolates from this area
were much bigger than that of Simmons's redescription (1982) according to
the Whetzol “Type” collection (#4852,CUP).Variations in conidial morphology and size among isolates occurred. Some of them (GropuⅠ) were thicker
spored with long beak,whereas others (GroupⅡ)were with relatively thinner
conidia and the beaks were even longer.primary infection sources of the disease
in this area were overwinterred old stem stakes,debris and inocula in the soil。
The scientific name and taxonomic history of the pathogen were discussed in
this paper。 |
| Key words: Qinling, Bashan mountain area, Panax quinquefolium L., Alternaria early blight, pathogen morphology, primary infection sources, Alternaria panax Whenz. |
