采用菌落生长法研究了定西市黄芪根腐病优势病原菌的生物学特性。结果表明，黄芪根部腐烂病害的优势致病病原菌为腐皮镰刀菌，其生长最适温度为25 ℃，最适pH为5～8。菌丝的致死温度为60 ℃恒温10 min。产孢最适温度为25 ℃，在pH为6时产孢量最高。能利用多种单糖、多糖及醇类作碳源和赖氨酸等有机氮和硝酸铵等无机氮作氮源。该菌对环境条件的适应范围较广，对营养要求不是很严格，菌丝生长和孢子产生的适宜条件及适应范围与甘肃黄芪栽培区的环境条件较为一致，这也是甘肃地区黄芪根腐病近年来发病严重的原因之一。

The biological characteristics of the dominant pathogen of Astragali root rot in Dingxi were studied by the method of colony growth. The results show that the dominant pathogens bacteria was Fusarium solani which caused Astragalus Root Rot, the optimum growth temperature was 25 ℃, and the optimum pH was 5~8. The lethal temperature of mycelium was 60 ℃ as constant temperature for 10 minutes. The optimum temperature of sporulation was 25 ℃, and the sporulation reached the highest when pH was 6. A variety of monosaccharides, polysaccharides and alcohols can be used as carbon sources, while organic and inorganic nitrogen, such as lysine and ammonium nitrate, as nitrogen sources. The fungus has a wide range of adaptation to environmental conditions and is not very strict in nutritional requirements. The suitable conditions and adaptation range of mycelium growth and spores were consistent with the environmental conditions in Astragali cultivation area of Gansu province, which is one of the causes of Astragali root rot in Gansu province in recent years.

S435.67

甘肃省农业科学院农业科技创新专项“甘肃地区黄芪根腐病优势病原毒素致病机理研究”(2013GAAS41)。