摘要： 为探究大豆孢囊线虫（SCN）即墨群体和莒县群体的生理小种类型及其对烟草的寄生性，采用杯栽试验和孢囊定量接种方法，测定2个SCN群体在5个大豆品种（4个生理小种鉴别寄主和1个感病对照品种Lee）和6个烟草品种上的繁殖和侵染情况。结果发现，SCN即墨群体在5个大豆品种上的繁殖系数（Rf=P_f/P_i）为1.88（0.05~9.03），在感病对照品种Lee上Rf高达9.03；在6个烟草品种上的Rf为0.01（0.00~0.04）。SCN莒县群体在5个大豆品种上的Rf为1.23（0.05~5.28），在感病对照品种Lee上Rf高达5.28；在6个烟草品种上的Rf为0.16（0.00~0.65）。研究表明，SCN即墨和莒县群体分别属于3号和6号生理小种，系这2个小种在山东省的首次发现。SCN即墨群体对6个烟草品种几乎均无寄生性，而莒县群体则对部分烟草品种（云烟85和NC95）有一定寄生性。

关键词: 大豆孢囊线虫, 生理小种, 烟草, 繁殖系数, 寄生性

Abstract: In order to explore the physiologic race type and the parasitism on tobacco of Jimo and Juxian populations of Heterodera glycines (SCN),the cup trial with quantitative inoculation was adopted,and the reproduction and infection performances were detected for the two populations on five soybean cultivars (including four host differentials and one susceptible standard cultivar Lee) and six tobacco ones.The results showed that the reproduction factor (Rf=P_f/P_i) of SCN Jimo population was 1.88(0.05-9.03) on the five soybean cultivars,with the Rf of 9.03 on the susceptible standard cultivar Lee,and the Rf was 0.01(0.00-0.04) on the six tobacco cultivars.The Rf of SCN Juxian population was 1.23(0.05-5.28) on the five soybean cultivars,with the Rf of 5.28 on the susceptible standard cultivar Lee,and the Rf was 0.16(0.00-0.65) on the six tobacco cultivars.The results indicated that the Jimo and Juxian populations of SCN were the physiologic race No.3 and No.6,respectively,both of which were found for the first time in Shandong Province.The SCN Jimo population had almost no parasitism on the six tobacco cultivars,and the Juxian population had certain parasitism on some tobacco cultivars such as Yunyan 85 and NC95.

Key words: Heterodera glycines, Physiologic race, Nicotiana tobacum, Reproduction factor, Parasitism

中图分类号: 

• S435.651