| Study on the antibacterial ability and growth\|promoting function of antagonistic bacteria J-6 of tobacco brown spot |
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| DOI：10.7606/j.issn.1000-7601.2026.02.24 |
| Key Words: tobacco brown spot Streptomyces albidoflavus biological control antibacterial ability growth\|promoting function |
| Author Name | Affiliation | | LI Guangzhe | College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory for Crop Stress Resistance and High\|Efficiency Production, Northwest A&F University, Yangling, Shaanxi 712100, China | | YANG Mingming | College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory for Crop Stress Resistance and High\|Efficiency Production, Northwest A&F University, Yangling, Shaanxi 712100, China | | WANG Pingping | hina National Tobacco Corporation Shaanxi Provincial Company, Xi’an, Shaanxi 710000, China | | TAN Jiaqi | hina National Tobacco Corporation Shaanxi Provincial Company, Xi’an, Shaanxi 710000, China | | AI Suilong | hina National Tobacco Corporation Shaanxi Provincial Company, Xi’an, Shaanxi 710000, China | | WANG Nana | College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory for Crop Stress Resistance and High\|Efficiency Production, Northwest A&F University, Yangling, Shaanxi 712100, China | | YAN Xia | College of Life Sciences, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory for Crop Stress Resistance and High\|Efficiency Production, Northwest A&F University, Yangling, Shaanxi 712100, China | | HUANG Lili | College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
State Key Laboratory for Crop Stress Resistance and High\|Efficiency Production, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Strain J-6 was isolated from apple bark. Sterile filtrate antibacterial tests revealed that the inhibition rates of 2% and 1% J-6 sterile filtrate against Alternaria alternata were 85.02% and 70.60%, respectively. The fermentation broth of J-6 was found to alter the hyphal morphology of A. alternata, causing the mycelial tip to expand and deform while inhibiting spore germination. Strain J-6 was identified as Streptomyces albidoflavus based on atpD-gyrB-recA multi\|gene phylogenetic analysis. Further research identified liposoluble metabolites and volatile substances as components responsible for its antagonistic activity. Additionally, strain J-6 exhibited the ability of nitrogen fixiation, extracellular protease secretion, and siderophore production. Seeds soaking and pot experiments demonstrated that strain J-6 promotes root elongation and dry matter accumulation in the above\|ground parts of tobacco seedlings, while root length increased from 1.19±0.21 cm to 1.45±0.19 cm (an increase of approximately 21.85%), and above\|ground dry mass increased from 0.57±0.08 g to 0.78±0.07 g (an increase of approximately 36.84%). |
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