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SR13-2菌株是前期从种植莴苣的土壤中分离获得的对致病疫霉菌丝生长和孢子萌发有强烈抑制作用的拮抗细菌,为进一步了解其生物学特性以及防治马铃薯晚疫病的潜力,本试验依据其培养特征、生理生化特性及16S r DNA序列对该菌株进行了鉴定,并测试了其菌液在离体马铃薯组织上的防病效果。结果显示该菌株属于深红沙雷氏菌(Serratia rubidaea),菌液在马铃薯块茎切片上对晚疫病的预防效果可达91.83%,治疗效果可达83.33%,显著优于甲霜灵锰锌以及其他几株拮抗细菌,在马铃薯离体叶片上也获得了相似的结果。这表明SR13-2菌株在马铃薯晚疫病防治方面有较大潜力。
SR13-2 strain is an antagonistic bacterium isolated from soils cultivated with lettuce and having strong inhibitory effect on mycelial growth and spore germination of Phytophthora sojae. To further understand its biological characteristics and potential for preventing potato late blight, this experiment According to its culture characteristics, physiological and biochemical characteristics and 16S r DNA sequence of the strain were identified and tested its bacteriological effect on the in vitro potato tissue. The results showed that the strain belongs to Serratia rubidaea. The prevention effect of the bacterial strain on late blight was 91.83% on the potato tuber slice, and the therapeutic effect was 83.33%, which was significantly better than that of metalaxyl, Several others antagonized the bacteria and obtained similar results on potato leaves in vitro. This indicates that SR13-2 strain has great potential in potato late blight prevention and control.