| 摘要: |
| 在无鉴别寄主体系的现状下，为研究不同地区的玉米南方锈菌Puccinia polysora Underw. 的相对寄生适合度(relative parasitic fitness)和致病性，以及不同玉米品种对其抗性水平，本试验以采自海南三亚、广东河源、广西河池、广西桂林、湖南邵东、云南玉溪6 个地区的可能存在致病性分化的同种玉米南方锈菌为研究对象，将其分别接种到28 个玉米品种上，分析其病情指数和相对寄生适合度。结果表明:抗病性最高的玉米品种为登海605，致病性最强的菌株来源于广西河池；不同来源的玉米南方锈菌在同一玉米品种上的相对寄生适合度存在较大差异；相同来源的菌株在不同玉米品种间相对寄生适合度之间也存在显著差异；玉米南方锈菌存在致病性分化。本研究可为抗玉米南方锈病品种选育及玉米南方锈菌致病类型与生理小种鉴定提供科学依据。 |
| 关键词: 玉米南方锈病 玉米南方锈菌 病情指数 相对寄生适合度 |
| DOI：10.11841/j.issn.1007-4333.2021.11.01 |
| 投稿时间：2021-02-27 |
| 基金项目:国家自然科学基金项目(31972211,31772101) |
|
| Relative parasitic fitness of in Puccinia polysora different maize varieties |
|
HUANG Liqun,ZHANG Keyu,LI Leifu,DONG Jiayu,SUN Qiuyu,DENG Jie,MA Zhanhong
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| (College of Plant Protection, Agricultural University of China, Beijing 100193, China) |
| Abstract: |
| In the absence of differential host system, this study is aimed to analyse the relative parasitic fitness and pathogenicity of southern corn rust collected from different regions. The resistance of maize varieties was evaluated. The Puccinia polysora Underw. strains obtained from Sanya Hainan, Heyuan Guangdong, Hechi Guangxi, Guilin Guangxi, Shaodong Hunan and Yuxi Yunnan were inoculated to 28 maize varieties to analyse the disease index and the relative parasitic fitness. The results showed that the varieties with the highest resistance to P. polysora was Denghai 605, and the most pathogenic strains came from Hechi, Guangxi. The relative parasitic fitness of P. polysora from different regions on the same maize variety was different. The relative parasitic fitness of the strains from the same regiron also had significant differences in different maize varieties. Different P. polysora strains had pathogenic differences. This study can provide basis for selection of resistant maize varieties to southern corn rust, the classification of pathogenic types and physiological races, and breeding of resistant varieties. |
| Key words: southern corn rust Puccinia polysora disease index relative parasitic fitness |
