不同条件下植物病原真菌对链霉菌702的敏感性研究

Study on the Sensibility of Plant Pathogenic Fungi to Streptomyces 702 under Different Conditions

[目的]研究不同条件下植物病原真菌对链霉菌702的敏感性变化。[方法]以水稻纹枯病菌、小麦赤霉病菌和烟草赤星病菌为供试菌,在不同氮(N)、磷(P)、钾(K)水平和不同温度条件下观察3种植物病原真菌对链霉菌702的敏感性变化。[结果]随着N水平的提高,纹枯病菌菌落直径生长速度减缓,气生菌丝增加,而赤霉病菌与赤星病菌的菌丝生长变化不明显。随N含量的增加,702对3种病菌的抑制率逐渐下降,随着P含量的增加,702对供试菌的抑制率显著增加,随着K含量的增加,702对供试菌的抑制率变化差异不大。当培养温度分别在30、25、25℃时,链霉菌702对水稻纹枯病菌、小麦赤霉病菌和烟草赤星病菌的抑制率最高。[结论]该研究为链霉菌702有效合理地应用及更好的防治植物病原菌提供了科学依据。

[Objective] The purpose was to study the sensibility change of plant pathogenic fungi to Streptomyces 702 under different conditions. [Method] With rice sheath blight fungus, wheat scab pathogen and tobacco brown spot pathogen as tested strains, the sensibility changes of 3 kinds of plant pathogenic fungi to Streptomyces 702 under different nitrogen and phosphorous levels and temperature conditions were observed. [Result] Along with nitrogen level increased, the growth speed of Rhlzoctonia solania colony diameter was slowed, the aerial mycelium was increased. But the changes of mycelium growth of Fusarium graminearum Schwabe and Alternaria alternate Keissler were not obvious. The restrain rate of Streptomyces 702 against the 3 tested strains gradually decreased along with nitrogen content increasing, significantly increased along with phosphorous content increasing, and had little change difference along with potassium content increasing. When the cultivation temperatures were at 30, 25 and 25 ℃, the restrain rates of Streptomyces 702 against rice sheath blight fungus, wheat scab pathogen and tobacco brown spot pathogen were highest. [Conclusion] The research provide scientific basis for applying Streptomyces 702 effectively and reasonably and controlling plant pathogenic fungi better.