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根据2年5次对国内外300份大豆资源以8个大豆灰斑病生理小种的接种鉴定和2年田间自然发病的调查,初步明确了这些材料对8个生理小种的抗性反应,明确了抗多个生理小种的抗病资源;田间抗性表现和人工接种鉴定出的抗性基因数目密切相关。8个生理小种抗性基因在品种中出现的频率相近;8个生理小种在感病、中抗和抗性等不同抗性品种中出现的频率也相近;单个生理小种抗性基因的出现与品种田间抗性表现无明显关系。这些结果表明,灰斑病抗性表现是多个致病力相近的抗性基因累加作用的结果。
According to the survey of 300 soybean germplasms at home and abroad for 8 inoculation of soybean gray leaf spot physiological races and the natural incidence in 2 years field, the resistance reaction of these materials to 8 races was preliminarily determined. Clear resistance to multiple races resistance resources; field resistance performance and artificial inoculation identified the number of resistant genes are closely related. The frequencies of 8 physiological races were similar in the cultivars. The frequency of occurrence of 8 races was similar in different resistant varieties such as susceptible, moderately resistant and resistant. The frequency of single physiological racial resistance There was no significant relationship with the resistance of cultivars in field. These results indicate that gray leaf spot resistance is a result of the cumulative effect of multiple resistance genes with similar pathogenicity.