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Biocontrol of Rhizoctonia solani K1 by Iturin A Producer Bacillus subtilis RB14 Seed Treatment in Tomato Plants

Advances in Microbiology 2016年第6期6卷 424-431页

作者： Umme Salma Zohora takashi ano Mohammad Shahedur Rahman Department of Biotechnology and Genetic Engineering Faculty of Biological Sciences Jahangirnagar University Dhaka Bangladesh Department of Biotechnological Science Faculty of Biology-Oriented Science and Technology Kinki University Kinokawa-city Japan

Bacillus subtilis RB14 was used as an antagonist against fungal pathogen Rhizoctonia solani K1 to control damping-off diseases in tomato plants. Tomato seeds were treated with B. subtilis RB14 culture. The concentration of bacterial cells for the treatment was about 108 cfu/ml. Treated tomato seeds showed 99% germination index similar to the untreated seeds. Scanning Electron Microscopic observations showed a clear evidence of the presence of B. subtilis RB14 on tomato seed surface. Clear inhibition zone was observed using treated seed in dual plate assay against R. solani K1. B. subtilis RB14 treated seed showed 80% reduction in disease incidence during in vivo plant experiments. B. subtilis RB14 produces lipopeptide antifungal antibiotic iturin A which could suppress R. solani K1. The phenomenon was supported by our observation where we found significant amount of iturin A from the root zone soil of the seed treated plants.

关键词： Bacillus subtilis RB14 Rhizoctonia solani K1 Seed Treatment Iturin A

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Production of iturin A through glass column reactor (GCR) from soybean curd residue (okara) by <i>Bacillus subtilis</i>RB14-CS under solid state fermentation (SSF)

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Advances in Bioscience and Biotechnology 2012年第2期3卷 143-148页

作者： Abdul Wahab Khan Umme Salma Zohora Mohammad Shahedur Rahman Masahiro Okanami takashi ano Chemical Resources Laboratory Tokyo Institute of Technology Yokohama Japan Department of Biotechnological Science Faculty of Biology-Oriented Science and Technology Kinki University Kinokawa Japan Department of Biotechnology and Genetic Engineering Faculty of Biological Sciences Jahangirnagar University Dhaka Bangladesh Proximo Biotech Ltd. Dinajpur Bangladesh.Chemical Resources Laboratory Tokyo Institute of Technology Yokohama Japan

The present study was conducted with an aim to scale up the production of iturin A using soybean curd residue (okara). Iturin A was produced by indigenous bacterial strain Bacillus subtilis RB14-CS through glass column reactor (GCR) under solid state fermentation (SSF) was characterized. The enhanced iturin A production was observed with respect to enhanced substrate bed height when SSF was conducted in Erlenmeyer flask. To check the effect of substrate bed height on iturin A production under SSF of okara, GCR was introduced. Substrate bed height of 15 cm was suitable for iturin A production which was about 2700 mg/kg wet substrate. The observed iturin A production by the aerobic bacteria Bacillus subtilis in nearly anaerobic condition in such high substrate bed for SSF is a wonderful finding for development of SSF system in future.

关键词： Solid State Fermentation Okara Iturin A Glass Column Reactor

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