本研究采用平板对峙法、菌丝生长速率法和菌核萌发抑制法筛选出一株细菌LB6-2,对立枯丝核菌的菌丝生长抑制率为71.76%,菌核萌发抑制率为100.00%。通过观察形态学特征、分析理化性质结合16S r DNA扩增序列分析对该菌株鉴定为萎缩芽胞杆菌...
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本研究采用平板对峙法、菌丝生长速率法和菌核萌发抑制法筛选出一株细菌LB6-2,对立枯丝核菌的菌丝生长抑制率为71.76%,菌核萌发抑制率为100.00%。通过观察形态学特征、分析理化性质结合16S r DNA扩增序列分析对该菌株鉴定为萎缩芽胞杆菌Bacillusatrophaeus(OK639005.1)。采用大孔树脂法提取发酵产物并进行HPLC制备,对获得的14个组分进行活性测定确定其活性组分,从活性组分中制备获得3个单品化合物LBN4-2、LBN4-4、LBN4-5,经HPLC-MS、NMR分析和活性测定结果表明,化合物LBN4-2为Cyclo(Pro-Val)、LBN4-4为Cyclo(D-Leu-L-Pro)和LBN4-5为Cyclo(L-prolyl-D-phenylalanyl),3个化合物的浓度在4 mmol/L时对立枯丝核菌菌丝生长的抑制率分别为86.16%、84.87%和83.10%,浓度在2 mmol/L以上时,对立枯丝核菌菌核萌发的抑制率为100%。由此可见,萎缩芽胞杆菌LB6-2具有作为防治立枯丝核菌生防菌剂研发的潜力。
Root rot disease has become increasingly severe on cowpea plants in Hainan Province, China in recent years due to the hot and humid climate conditions. To identify the causal agent of the disease, cowpea plants with t...
Root rot disease has become increasingly severe on cowpea plants in Hainan Province, China in recent years due to the hot and humid climate conditions. To identify the causal agent of the disease, cowpea plants with typical symptom of root rot were collected from Sanya City, Hainan Province in June 2023. A total of 20 single-spore fungal isolates with similar morphology were obtained, and their pathogenicity was confirmed by artificial inoculation test. Based on morphological characteristics and phylogenetic relationship inferred from rDNA ITS, TEF1-α and RPB2 sequences, these isolates were identified as Corynespora *** is the first report of cowpea root rot caused by C. cassiicola in China.
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