Bacillus velezensis WB invokes soil suppression of Fusarium oxysporum f. sp. niveum by inducing particular taxa

IF 3.5 2区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY Annals of Agricultural Science Pub Date : 2023-12-01 DOI:10.1016/j.aoas.2023.12.005
Shiqi Luo, Zhigang Wang, Weihui Xu
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Abstract

Fusarium wilt of watermelon caused by Fusarium oxysporum f. sp. niveum (Fon) results in a substantial economic losses in agriculture. Biological control agents (BCAs) help in controlling the infection of Fon. However, it remains unclear whether the application of BCAs can invoke soil suppression by inducing specific microbial groups concerned with disease suppression to synergistically resist fungal pathogens. The objective of this project was to determine the microbial mechanisms involved in disease suppression by BCAs. Here, we conducted pot experiments to explore Fusarium wilt in watermelon and soil microbial communities in response to different treatments. We found that the application of Bacillus velezensis WB enhanced disease suppression in nonsterilized soil. We further found that disease suppression in the WF treatment was connected to influence on the resident soil microbial communities, explicitly by causing an increase in Hyphomicrobiaceae and Chitinophagaceae. Pathogen suppression by the above two families was further studied in laboratory and pot experiments. The results showed that a synthetic community consisting of specific bacterial taxa effectively decreased the incidence of Fusarium wilt. B. velezensis WB introduction impacts the resident soil microbiome and invokes soil suppression by inducing resident microbes. Our results should help in designing synthetic microbial communities to improve soil function.

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Velezensis WB 杆菌通过诱导特定类群抑制土壤中的 Fusarium oxysporum f. sp.
由 Fusarium oxysporum f. sp. niveum(Fon)引起的西瓜镰刀菌枯萎病给农业造成了巨大的经济损失。生物防治剂(BCA)有助于控制 Fon 的感染。然而,施用生物防治剂是否能通过诱导与病害抑制有关的特定微生物群协同抵抗真菌病原体而引起土壤抑制作用,目前仍不清楚。本项目的目的是确定参与 BCA 抑病的微生物机制。在此,我们进行了盆栽实验,探索西瓜镰刀菌枯萎病和土壤微生物群落对不同处理的反应。我们发现,施用枯草芽孢杆菌 WB 增强了非灭菌土壤中的病害抑制能力。我们进一步发现,WF 处理中的病害抑制与常驻土壤微生物群落受到的影响有关,明确地说,是通过导致嗜水生微生物科(Hyphomicrobiaceae)和嗜甲壳微生物科(Chitinophagaceae)的增加。我们在实验室和盆栽实验中进一步研究了上述两个科对病原体的抑制作用。结果表明,由特定细菌类群组成的合成群落能有效降低镰刀菌枯萎病的发病率。B. velezensis WB 的引入影响了常住土壤微生物群落,并通过诱导常住微生物产生土壤抑制作用。我们的研究结果将有助于设计合成微生物群落来改善土壤功能。
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来源期刊
Annals of Agricultural Science
Annals of Agricultural Science AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
12.60
自引率
0.00%
发文量
18
审稿时长
33 days
期刊介绍: Annals of Agricultural Sciences (AOAS) is the official journal of Faculty of Agriculture, Ain Shams University. AOAS is an open access peer-reviewed journal publishing original research articles and review articles on experimental and modelling research at laboratory, field, farm, landscape, and industrial levels. AOAS aims to maximize the quality of the agricultural sector across the globe with emphasis on the Arabian countries by focusing on publishing the high-quality applicable researches, in addition to the new methods and frontiers leading to maximizing the quality and quantity of both plant and animal yield and final products.
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