中国小麦条锈菌主要流行菌系的寄生适合度研究  

Parasitic fitness of the major epidemic strains of Puccinia striiformis f. sp. tritici in China

作　　者：王保通[1] 李高宝[1] 李强[1] 王芳[1] 史亚千[1] 刘倩如[1] 康振生[1] 

机构地区：[1]西北农林科技大学植物保护学院与陕西省农业分子生物学重点实验室,杨凌712100

出　　处：《植物病理学报》2009年第1期82-87,共6页Acta Phytopathologica Sinica

基　　金：国家"十一五"科技支撑计划(2006BAD08A05);陕西省"13115"科技创新工程重大科技专项(2006K02-G10-01);教育部长江学者和创新团队发展计划项目(200558);"高等学校学科创新引智计划"(No.B07049)

摘　　要：为了预测我国未来小麦条锈菌的优势种群,本研究采用抗性组分法测定了我国条锈菌主要流行菌系的寄生适合度。结果表明:决定我国小麦条锈菌最重要的寄生适合度属性为条锈菌的产孢能力(繁殖力),其次为条锈菌的侵染能力,再次为扩展能力;建立了小麦条锈菌寄生适合度属性3个主成份的数学模型;在供试的菌系中,Su11-4、Su11-14和CY32相对寄生适合度较高,已经成为我国目前小麦条锈菌的优势小种(类型);CY31由于其寄生适合度较低,出现频率逐年下降,已成为次要小种,感染"中四"苗期的新菌系T4类型,由于其寄生适合度低,也不会成为今后一个时期的流行小种。In order to predict the future predominant isolates in the populations of Puccinia striiformis f. sp. tritici in China, parasitic fitness of current prevalent isolates were estimated through testing resistant components. The results showed that the sporulation capacity contributed to most important portion in parasitic fitness, and the next two important characters for rust fungal parasitic fitness were infectivity （represented by number of colonies） and latent period. Germination ability didn＇ t show significant difference among the tested races. The mathematical models had been firstly developed to estimate three principal components of pathogen parasitic fitness： sporulation capacity, infectivity and latent period. According to these models, the relative parasitic fitness of isolates Su11-4, Su11-14 and CY32 was higher than that of other tested races and had already been the predominant races at the present time. Isolate CY31 showed lower parasitic fitness, its occurrence frequency had been decreasing recent years and it was becoming secondary race. Also, for the lower parasitic fitness, the new pathogenic type ＂T4＂ infected the seedling of differential host ＂Zhong 4＂ couldn＇ t become the prevalent race in the near future.

关 键 词：小麦条锈菌 流行菌系 寄生适合度 

分 类 号：S435.121.42[农业科学—农业昆虫与害虫防治]