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拮抗芽孢杆菌作为生物防治手段对由腐皮镰刀菌（ Fusarium cf. incarnatum ）引起的人参根腐病的作用。

Antagonistic Bacillus species as a biological control of ginseng root rot caused by Fusarium cf. incarnatum.

机构信息

Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, Korea.

出版信息

J Ginseng Res. 2014 Apr;38(2):136-45. doi: 10.1016/j.jgr.2013.11.016. Epub 2013 Dec 17.

DOI:10.1016/j.jgr.2013.11.016
PMID:24748838
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3986660/
Abstract

BACKGROUND

This study aimed to develop a biocontrol system for ginseng root rot caused by Fusarium cf. incarnatum.

METHODS

In total, 392 bacteria isolated from ginseng roots and various soils were screened for their antifungal activity against the fungal pathogen, and a bacterial isolate (B2-5) was selected as a promising candidate for the biocontrol because of the strong antagonistic activity of the bacterial cell suspension and culture filtrate against pathogen.

RESULTS

The bacterial isolate B2-5 displayed an enhanced inhibitory activity against the pathogen mycelial growth with a temperature increase to 25°C, produced no pectinase (related to root rotting) and no critical rot symptoms at low [10(6) colony-forming units (CFU)/mL] and high (10(8) CFU/mL) inoculum concentrations. In pot experiments, pretreatment with the bacterial isolate in the presumed optimal time for disease control reduced disease severity significantly with a higher control efficacy at an inoculum concentration of 10(6) CFU/mL than at 10(8) CFU/mL. The establishment and colonization ability of the bacterial isolates on the ginseng rhizosphere appeared to be higher when both the bacterial isolate and the pathogen were coinoculated than when the bacterial isolate was inoculated alone, suggesting its target-oriented biocontrol activity against the pathogen. Scanning electron microscopy showed that the pathogen hyphae were twisted and shriveled by the bacterial treatment, which may be a symptom of direct damage by antifungal substances.

CONCLUSION

All of these results suggest that the bacterial isolate has good potential as a microbial agent for the biocontrol of the ginseng root rot caused by F. cf. incarnatum.

摘要

背景

本研究旨在开发一种针对人参根腐病（由尖孢镰刀菌引起）的生物防治系统。

方法

从人参根和各种土壤中分离出 392 株细菌，筛选出对真菌病原体具有抗真菌活性的细菌，并选择细菌分离株（B2-5）作为有前途的生物防治候选物，因为细菌悬浮液和培养液对病原体的拮抗活性较强。

结果

细菌分离株 B2-5 在温度升高至 25°C 时，对病原菌菌丝生长的抑制活性增强，在低[10（6）菌落形成单位（CFU）/mL]和高（10（8）CFU/mL）接种浓度下，不产生果胶酶（与根腐病有关）和严重腐烂症状。在盆栽试验中，在假定的最佳防治时间用细菌分离物预处理可显著降低病害严重度，在 10（6）CFU/mL 接种浓度下的防治效果高于 10（8）CFU/mL。当细菌分离物和病原体同时接种时，其在人参根际的定殖和定殖能力似乎高于单独接种细菌分离物时，这表明其对病原体具有有针对性的生物防治活性。扫描电子显微镜显示，病原菌菌丝在细菌处理下扭曲收缩，这可能是抗真菌物质直接损伤的症状。

结论

所有这些结果表明，该细菌分离物具有作为防治尖孢镰刀菌引起的人参根腐病的微生物剂的良好潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/d85960c8ad77/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/b063326d9511/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/ff03f675b45f/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1f5e2a0b8388/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1d0e3e01f883/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/89732e5d367f/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/fc78d8660ebc/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/42708bb3e475/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1320e1cff24a/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/fda8d6dbcd49/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/d85960c8ad77/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/b063326d9511/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/ff03f675b45f/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1f5e2a0b8388/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1d0e3e01f883/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/89732e5d367f/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/fc78d8660ebc/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/42708bb3e475/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/1320e1cff24a/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/fda8d6dbcd49/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/fe5d/3986660/d85960c8ad77/gr10.jpg

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