摘要:
从我国不同省份红麻病区采样分离获得16个炭疽病菌株,选有代表性的5个菌株,经产孢量和致病力测定显示,mXS1菌株产孢量最多,对红麻侵染力最强,以伤口侵入为主,并能侵染老叶。进一步用m- XS1菌株,在温室里采用针伤茎叶+涂抹孢子和健株喷雾孢子悬液,对不同品种进行接种试验,结果看出,室内高湿下参试品种喷雾接种能充分发病,3个品种表现近似免疫,所得病情指数与伤茎叶接种之间相关系数r=0.774,呈极显著正相关。在大田采用以上2种方法接种160份红麻种质,结果表明伤茎叶接种中7份种质表现高抗,可为红麻杂交亲本选配提供可靠抗源。
关键词:
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红麻 /
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炭疽病 /
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接种方法 /
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种质资源 /
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抗源筛选
Abstract:
Sixteen strains of Colletotrichum indicum were isolated from the infected kenaf samples collected from 4 provinces in China.Sporulation and pathogenicity of 5 representative strains of them were tested.The results showed that the m-XS1 strain was the most pathogenic species and produced the greatest number of spores.Its infection occurred mainly on the wounded kenaf and matured leaves.The strain was inoculated on 11 kenaf varieties,with or without wound,in a greenhouse.All tested varieties were infected by C.indicum under high humidity,with 3 of them were nearly immune to the disease.It was significantly correlated to kenaf’s disease indices,with or without wound(r=0.774).The same treatments on 160 kenaf varieties were performed in the field.Seven kenaf varieties were highly resistant to the disease.They could be used as high resistant kenaf parents for further research.
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