摘要
通过对玉米灰斑病菌侵染后的显症过程的系统观察,可在组织水平上说明该病菌与寄主互作反应存在分化或多样性:玉米灰斑病菌不同菌株侵染后显症过程表现出明显的差异;玉米灰斑病菌在侵袭力上存在多样性,菌株间对同一种品种的致病性表现多样化,或者同一菌株对不同品种侵染引起的寄主反应表现为多样性;病斑反应型的分化,玉米灰斑病菌侵染玉米品种或自交系后,主要有7种病斑反应类型,即RH型(长矩形具褪绿晕圈病斑)、RN型(长矩形无褪绿晕圈病斑)、IRH型(不规则形具褪绿晕圈病斑)、IRN型(不规则形无褪绿晕圈病斑)、SH型(斑点形具褪绿晕圈病斑)、RI型(长矩形与不规则形混合病斑)和RS型(长矩形与斑点形混合病斑),若发病严重,病斑连成片,而且这些反应类型出现的频率也不同。
The progress levels of symptoms after pathogen infection showed that interaction of gray leaf spot(GLS) pathogen and host has differentiation or polymorphism. The progress levels of symptoms is different.The aggressively has polymorphism. The pathogenicity of different isolates in same cultivar has polymorphism, or the host reaction type of same isolate in different cultivars has polymorphism.The host reaction type has differentiation. There are seven types of host reaction in cultivar and inbred after infected by GLS pathogen:Rectangular lesion without chlorotic halo(RN), Rectangular lesion with chlorotic halo(RH),Irregular lesion without chlorotic halo(IRN),Irregular lesion with chlorotic halo(IRH), Spot lesion with chlorotic halo(SH),Rectangular and irregular lesion(RI)and Rectangular and spot lesion (RS). The host reaction type is coalesced lesion (CL) when disease severely. Frequency of each reaction types is different.
出处
《华北农学报》
CSCD
北大核心
2005年第3期94-99,共6页
Acta Agriculturae Boreali-Sinica
基金
国家十五攻关课题(2001BA509B05)
关键词
玉米灰斑病菌
显症过程
侵袭力
病斑反应型
Gray leaf spot pathogen
Progress levels of symptom
Aggressivity
Host reaction type
