Fetch T G, Jin Y
Cereal Research Centre, Agriculture and Agri-Food Canada, Winnipeg, MB R3T 2M9, Canada.
Cereal Disease Laboratory, United States Department of Agriculture-Agricultural Research Service, University of Minnesota, St. Paul 55108.
Plant Dis. 2007 Jun;91(6):763-766. doi: 10.1094/PDIS-91-6-0763.
Current systems that describe the virulence phenotype in Puccinia graminis f. sp. avenae lack a systematic approach for the naming of races or to provide easily made comparisons of virulence among races. A new nomenclature system that simply and systematically characterizes virulence in P. graminis f. sp. avenae is described. The new system has the distinct advantage of providing easily seen relationships among races in contrast to previous nomenclature systems. This allows for easier interpretation of virulence relationships in the oat stem rust population and provides a large amount of virulence information with a minimum of written characters. This system uses single-gene differential lines with the resistance genes Pg1, Pg2, Pg3, Pg4, Pg6, Pg8, Pg9, Pg10, Pg12, Pg13, Pg15, and Pg16, grouped into three subsets of four lines in sequential Pg gene order. By grouping in sequential gene number order, the relationship of the new system to the "standard" system is easily seen. Each race is designated by a three-letter code, based on the seedling reaction (low or high) on 12 differential lines. The letter code nomenclature system is open ended and can be updated easily as new differential genes are identified. This system simply and precisely describes the virulence phenotypes of isolates of P. graminis f. sp. avenae, and allows for easily made comparisons of virulence of isolates collected over time and across geographical locations worldwide.
当前描述燕麦秆锈菌毒性表型的系统缺乏一种系统的方法来命名小种或进行小种间毒性的简易比较。本文描述了一种简单且系统地对燕麦秆锈菌毒性进行特征描述的新命名系统。与先前的命名系统相比，新系统具有明显优势，即能让小种间的关系一目了然。这便于对燕麦秆锈菌群体中的毒性关系进行解读，且能用最少的文字提供大量毒性信息。该系统使用带有抗性基因Pg1、Pg2、Pg3、Pg4、Pg6、Pg8、Pg9、Pg10、Pg12、Pg13、Pg15和Pg16的单基因鉴别系，按照Pg基因顺序依次分为四个系的三个子集。通过按基因编号顺序分组，新系统与“标准”系统的关系一目了然。每个小种由一个三字母代码指定，该代码基于在12个鉴别系上的幼苗反应（低或高）。字母代码命名系统是开放式的，随着新鉴别基因的发现可轻松更新。该系统简单而精确地描述了燕麦秆锈菌分离株的毒性表型，并便于对不同时间和全球不同地理位置收集的分离株的毒性进行比较。
