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抗不同生化型青枯菌的生防菌筛选鉴定及其活性分析

, PP. 431-435

Keywords: 青枯菌生化型,抑菌物质,拮抗活性,菌密度,解淀粉芽孢杆菌

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Abstract:

为更好地利用生防菌控制青枯病危害,从不同地区的土壤中分离到569株细菌菌株,筛选到3株对5种不同生化型青枯劳尔氏菌Ralstoniasolanacearum具有较强拮抗活性的菌株,其中菌株BS2004的拮抗活性最强。以BS2004的菌悬液为对照,分别测定无菌滤液、蛋白酶K及高温热处理后拮抗物质抑菌活性的变化。结果显示,蛋白酶K及高温热处理后,该菌的抑菌活性显著降低,表明其主要抑菌成分为蛋白类物质。在设施栽培条件下用生防菌BS2004菌悬液处理番茄植株,能有效控制番茄青枯病的发生,防治效果达66.75%,同时还发现,重新分离得到的青枯菌菌体数明显受到生防菌的抑制。通过对BS2004的形态、生理生化特征、脂肪酸鉴定、16SrDNA序列等进行分析,该菌株被鉴定为解淀粉芽孢杆菌Bacillusamyloliquefaciens。

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