title: Plant growth-promoting rhizobacteria strain Bacillus amyloliquefaciens NJN-6-enriched bio-organic fertilizer suppressed Fusarium wilt and promoted the growth of banana plants.
abstract: Bacillus amyloliquefaciens strain NJN-6 is an important plant growth-promoting rhizobacteria (PGPR) which can produce secondary metabolites antagonistic to several soil-borne pathogens. In this study, the ability of a bio-organic fertilizer (BIO) containing NJN-6 strain to promote the growth and suppress Fusarium wilt of banana plants was evaluated in a pot experiment. The results showed that the application of BIO significantly decreased the incidence of Fusarium wilt and promoted the growth of banana plants compared to that for the organic fertilizer (OF). To determine the beneficial mechanism of the strain, the colonization of NJN-6 strain on banana roots was evaluated using scanning electron microscopy (SEM). The plant growth-promoting hormones indole-3-acetic acid (IAA) and gibberellin A3 (GA3), along with antifungal lipopeptides iturin A, were detected when the NJN-6 strain was incubated in both Landy medium with additional l-tryptophan and in root exudates of banana plants. In addition, some antifungal volatile organic compounds and iturin A were also detected in BIO. In summary, strain NJN-6 could colonize the roots of banana plants after the application of BIO and produced active compounds which were beneficial for the growth of banana plants.
authors.affiliation: Jiangsu Key Lab for Organic Solid Waste Utilization, Nanjing Agricultural University , 210095, Nanjing, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Yuan
authors.forename: Yunze
authors.initials: Y
authors.lastname: Ruan
authors.forename: Beibei
authors.initials: B
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Zhang
authors.forename: Raza
authors.initials: R
authors.lastname: Waseem
authors.forename: Qiwei
authors.initials: Q
authors.lastname: Huang
authors.forename: Qirong
authors.initials: Q
authors.lastname: Shen
mesh_terms: D001407:Bacillus / Q000502:physiology*; D005308:Fertilizers / Q000382:microbiology*; D005670:Fusarium; D028521:Musa / Q000254:growth & development* / Q000382:microbiology*; D010935:Plant Diseases / Q000382:microbiology / Q000517:prevention & control*; D010937:Plant Growth Regulators; D018517:Plant Roots / Q000382:microbiology
chemical_list: D005308:Fertilizers; D010937:Plant Growth Regulators