title: Isolation of Bacillus amyloliquefaciens S20 and its application in control of eggplant bacterial wilt.
abstract: Bacterial strain S20 was isolated and identified as Bacillus amyloliquefaciens based on physiological and biochemical characteristics and a 16S rRNA gene sequence analysis. Strain S20 inhibits the growth of Fusarium oxysporum and Ralstonia solanacearum. Some genes associated with the synthesis of some lipopeptides were detected in strain S20 by PCR. Iturins A were identified as the main antagonistic substrates by analysis with electrospray ionization mass spectrometry/collision-induced dissociation (ESI-MS/CID). Four homologues of iturin A (C13-C16) were identified. Pot experiments showed that the application of strain S20 alone could control eggplant wilt with an efficacy of 25.3% during a 40 day experiment. If strain S20 was used with organic fertilizer, the control efficacy against eggplant wilt reached as high as 70.7%. The application of organic fertilizer alone promotes the growth of R. solanacearum, resulting in a higher wilt incidence than that observed in control plants. The application of strain S20 effectively inhibits R. solanacearum in the rhizosphere soil of eggplant. The combined use of strain S20 and organic fertilizer more effectively controlled R. solanacearum in soil than the use of strain S20 alone. The soil count of strain S20 decreased gradually during the course of the experiment after inoculation. Organic fertilizer was beneficial for the survival of the antagonistic bacterial strain S20; a higher level of these bacteria could be maintained. The application of organic fertilizer with strain S20 increased bacterial diversity in rhizosphere soil.
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Da
authors.initials: D
authors.lastname: Chen
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Chunyu
authors.initials: C
authors.lastname: Li
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Tian
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Qirong
authors.initials: Q
authors.lastname: Shen
authors.affiliation: National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Utilization, Nanjing Agricultural University, Nanjing 210095, China. Electronic address: shenbiao@njau.edu.cn.
authors.forename: Biao
authors.initials: B
authors.lastname: Shen
mesh_terms: D001407:Bacillus / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D005308:Fertilizers; D005670:Fusarium / Q000502:physiology*; D010456:Peptides, Cyclic / Q000378:metabolism*; D010935:Plant Diseases / Q000382:microbiology / Q000517:prevention & control*; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D043368:Ralstonia solanacearum / Q000502:physiology*; D058441:Rhizosphere; D012988:Soil Microbiology; D032323:Solanum melongena / Q000382:microbiology*
chemical_list: D005308:Fertilizers; D010456:Peptides, Cyclic; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; C013579:iturin A
keywords: Antibiotic compounds; Bacterial diversity; Biocontrol efficiency; Isolation and identification; Iturins A