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期 刊 ：植物保护学报 2007年

关键词：水稻；条纹叶枯病；抗性；遗传；

Keywords:rice, Rice stripe virus, resistance, inheritance,

摘 要 ：采用田间小区鉴定方法研究27份粳稻品种对水稻条纹叶枯病的抗性表现,并在此基础上选择抗性表现强的镇稻88与高感品种武育粳3号构建F₂分离群体进行遗传分析。结果表明,粳稻品种对水稻条纹叶枯病的田间抗性表现在不同年份和不同地区间存在一定的差异,但镇稻88、连粳4号、徐稻3号等9个品种在鉴定试验中均表现为抗病和高抗,可作为抗病品种在江苏地区推广应用。镇稻88与武育粳3号的F₂群体抗感表型分离比例符合3∶ 1,表明镇稻88对条纹叶枯病的抗性受一对显性核基因的控制,将其作为抗病亲本使用可大大加快育种进程。研究同时发现在灰飞虱不引发虫害的条件下,有效接种虫量与感病对照发病率相关性达显著水平,当其值在0.8×10⁶~3.6×10⁶/hm²范围内时可作为水稻条纹叶枯病田间抗性鉴定有效的参考指标。

Abstract:Rice stripe resistance in the field was identified among twenty-seven japonica rice varieties derived from Jiangsu Province. The inheritance of rice stripe resistance in F₂ lines from the cross Zhendao 88/ Wuyujing No. 3 was studied. The result revealed that rice stripe resistance exists in some difference among the japonica rice varieties in different years and fields. However, nine varieties, such as Zhendao 88, Lianjing No. 4 and Xudao No. 3 etc., displaying high-resistance or resistance in all test, could be populated in Jiangsu Province. The segregation of F₂ lines from the cross Zhendao 88/ Wuyujing No. 3 fit a ratio of 3(resistance)∶ 1(susceptible) as except. These data support the conclusion that the resistance of Zhendao 88 is inherited as a single recessive trait. It could accelerate rice breeding process that Zhendao 88 was used as resistance parent. In addition, we found out that, under the condition of not causing insect damage by the small brown planthopper (SBPH), the correlation between the viruliferous SBPH and the incidence of a disease of susceptible control reaches significant level. It revealed that resistance identification of rice varieties to rice stripe in the field was effective, when the value of viruliferous SBPH was 0.8×10⁶/hm² to 3.6×10⁶/hm².

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