| 辣椒疫霉（Phytophthora capsici）对辣椒的致病力分化研究 |
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| 引用本文： | 李萍,江涛,高智谋,戚仁德,汪涛.辣椒疫霉（Phytophthora capsici）对辣椒的致病力分化研究[J].植物病理学报,2012,42(4):431-435. |
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| 作者姓名： | 李萍 江涛 高智谋 戚仁德 汪涛 |
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| 作者单位： | （安徽农业大学植物保护学院，合肥 230036； 安徽省农业科学院植物保护研究所，合肥 230031） |
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| 基金项目： | 国家公益性行业(农业)科研专项，安徽省自然科学基金项目 |
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| 摘 要： | 辣椒疫霉（Phytophthora capsici Leonian）是具有重大危害性的病原卵菌，其寄主范围较广，可引致辣椒、番茄、茄子、黄瓜、南瓜等多种重要蔬菜作物的疫病。由辣椒疫霉引起的辣椒疫病是一种毁灭性病害，在世界各地的辣椒种植区普遍发生，我国尤以江苏、浙江、安徽、上海等长江中下游地区发生严重。迄今国内关于辣椒疫霉致病力分化的研究较少，且存在分歧。有报道指出辣椒疫霉菌株对辣椒的致病力差异与菌株地区来源直接相关［1］；也有研究认为辣椒疫霉菌株对辣椒的致病力与地理来源不直接相关［2］。此外，辣椒疫霉菌株致病力分化和菌丝生长速率是否相关尚属未知。本文对采自安徽合肥、淮南、和县、潜山、岳西、江苏南京和四川邛崃7个县市的23个辣椒疫霉菌株对辣椒的致病力和菌丝生长速率进行了测定，旨在明确辣椒疫霉菌株对辣椒的致病力是否存在分化现象及致病力与菌株地区来源及菌丝生长速率之间的关系，为辣椒疫霉所致辣椒疫病的抗病育种和综合治理提供依据。
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| 关 键 词： | Phytophthora capsici Leonian pathogenicity differentiation mycelium growth rate pepper UPGMA |
| 收稿时间： | 2011-09-23; |
Pathogenicity differentiation of isolates of Phytophthora capsici to pepper |
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| LI Ping
,
JIANG Tao
,
GAO Zhi-mou
,
QI Ren-de
,
WANG Tao.Pathogenicity differentiation of isolates of Phytophthora capsici to pepper[J].Acta Phytopathologica Sinica,2012,42(4):431-435. |
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| Authors: | LI Ping JIANG Tao GAO Zhi-mou QI Ren-de WANG Tao |
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| Institution: | ( College of Plant Protection, Anhui Agricultural University, Hefei 230036, China; Institute of Plant Protection, Anhui Academy of Agricultural Sciences, Hefei 230031, China) |
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| Abstract: | The studies on pathogenicity differentiation of isolates in Phytophthora capsici Leonian on pepper were carried out to explore the relationship between pathogenicity differentiation and isolate localities,the correlation between the pathogenicity and mycelium growth rates,and to provide more information for disease-resistant cultivar breeding and integrated management of the disease.Twenty-three isolates of P.capsici were obtained from the diseased peppers collected from Hefei,Huainan,Hexian,Qianshan,Yuexi,Nanjing and Qionglai by means of tissue isolation.The pathogenicity of the isolates from different areas was investigated by applying mycelium block stem wound inoculation on pepper seedlings and leaf in vitro inoculation,respectively.The cluster analysis of the pathogenicity data was done by unweighted pair group method with arithmetic averages(UPGMA) and the relationship between pathogenicity and geographical origin of isolates were analyzed.The mycelium growth rates of the isolates were tested and the correlation between the pathogenicity to pepper and growth rates was investigated.The results showed that all the tested isolates caused pepper blight on the stems and leaves inoculated,but there was significant difference in the diameters of the stem lesions and the severity caused by different isolates.Based on the average diameters of the stem lesions,the pathogenicity of the isolates could be classified into three categories,strong,intermediate and weak.The pathogenicity tes-ted with stem wound inoculation in vivo was positively correlated to that tested with leaf in vitro inoculation(r=0.576 5,R2=0.332 4).However,the pathogenicity of P.capsici to pepper seedlings had little correlation with growth rate(R2=0.013 7).It was suggested that there was significant differentiation in pathogenicity of isolates in P.capsici on pepper.The isolates could be classified into three types of pathogenicity,strongly,intermediately and weakly pathogenic.However,the pathogenicity difference was not obviously related to the localities of isolates,and had little relation with the mycelium growth rates. |
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| Keywords: | Phytophthora capsici Leonian pathogenicity differentiation mycelium growth rate pepper UPGMA |
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