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The Endophytic Bacteria Bacillus velezensis Lle-9, Isolated from Lilium leucanthum, Harbors Antifungal Activity and Plant Growth-Promoting Effects

文献类型： 外文期刊

作者： Khan, Mohammad Sayyar 1 ; Gao, Junlian 1 ; Chen, Xuqing 1 ; Zhang, Mingfang 1 ; Yang, Fengping 1 ; Du, Yunpeng 1 ; Moe 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Agrobiotechnol Res Ctr, Beijing 100097, Peoples R China

2.Univ Agr, IBGE, Genom & Bioinformat Div, Peshawar 25000, Khyber Pakhtunk, Pakistan

3.Minist Educ, Mandalay Div, Biotechnol Res Dept, Pharmaceut Res Lab, Kyaukse 05151, Myanmar

关键词： Endophytic bacteria; antifungal activity; secondary metabolites; plant growth promotion

期刊名称：JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：2.351； 五年影响因子：2.65 ）

ISSN： 1017-7825

年卷期： 2020 年 30 卷 5 期

页码：

收录情况： SCI

摘要： Bacillus velezensis is an important plant growth-promoting rhizobacterium with immense potential in agriculture development. In the present study, Bacillus velezensis Lle-9 was isolated from the bulbs of Lilium leucanthum. The isolated strain showed antifungal activities against plant pathogens like Botryosphaeria dothidea, Fusarium oxysporum, Botrytis cinerea and Fusarium fujikuroi. The highest percentage of growth inhibition i.e., 68.56 +/- 2.35% was observed against Fusarium oxysporum followed by 63.12 +/- 2.83%, 61.67 +/- 3.39% and 55.82 +/- 2.76% against Botrytis cinerea, Botryosphaeria dothidea, and Fusarium fujikuroi, respectively. The ethyl acetate fraction revealed a number of bioactive compounds and several were identified as antimicrobial agents such as diketopiperazines, cyclo-peptides, linear peptides, latrunculin A, 5a-hydroxy-6-ketocholesterol, (R)-S- lactoylglutathione, triamterene, rubiadin, moxifloxacin, 9- hydroxy-5Z,7E,11Z, 14Z-eicosatetraenoic acid, D-erythro-C18-Sphingosine, citrinin, and 2-arachidonoyllysophosphatidylcholine. The presence of these antimicrobial compounds in the bacterial culture might have contributed to the antifungal activities of the isolated B. velezensis Lle-9. The strain showed plant growth-promoting traits such as production of organic acids, ACC deaminase, indole-3-acetic acid (IAA), siderophores, and nitrogen fixation and phosphate solubilization. IAA production was accelerated with application of exogenous tryptophan concentrations in the medium. Further, the lily plants upon inoculation with Lle-9 exhibited improved vegetative growth, more flowering shoots and longer roots than control plants under greenhouse condition. The isolated B. velezensis strain Lle-9 possessed broad-spectrum antifungal activities and multiple plant growth-promoting traits and thus may play an important role in promoting sustainable agriculture. This strain could be developed and applied in field experiments in order to promote plant growth and control disease pathogens.

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