揭开隐藏世界的面纱:丛枝菌根真菌及其调控的核心真菌如何改变大豆根瘤微生物组的组成和代谢。

IF 6.2 2区 环境科学与生态学 Q1 GENETICS & HEREDITY
Minkai Yang, Yuhang Song, Hanke Ma, Zhenghua Li, Jiawei Ding, Tongming Yin, Kechang Niu, Shucun Sun, Jinliang Qi, Guihua Lu, Aliya Fazal, Yonghua Yang, Zhongling Wen
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引用次数: 0

摘要

背景:丛枝菌根真菌(AMF)与植物之间的共生关系往往能刺激植物生长,提高农业产量,降低成本,从而带来显著的经济效益。AMF还能通过影响根圈微生物群落使植物受益,但其潜在机制仍不清楚。我们以Rhizophagus intraradices为模式AMF物种,通过16 S rRNA基因测序和非靶向代谢组学分析,评估了在酸性土壤中接种病原真菌Nigrospora oryzae和溶磷真菌Talaromyces verruculosus的铝敏感大豆根圈中,AMF如何影响细菌组成和功能多样性:接种R. intraradices、N. oryzae和T. verruculosus对土壤中C、N和P的含量以及种子重量、粗脂肪和蛋白质含量等植物特征没有显著影响。不过,它们的接种影响了常驻细菌群落的结构、功能和营养动态。T.verruculosus和R. intraradices的共同接种增加了根瘤菌圈中精神耐旱假单胞菌的相对丰度,这种假单胞菌具有固氮能力,与呼救理论(植物在受到胁迫时发出信号寻求有益微生物)有关。R. intraradices 增加了与合成不饱和脂肪酸有关的代谢途径的表达,而众所周知,不饱和脂肪酸能增强植物在不利环境条件下的抵抗力。接种 N. oryzae 真菌后,根系内圈的多烯类大环内酯类抗真菌抗生素产生菌属链霉菌富集,并上调了根圈中与类固醇生物合成途径相关的两条抗菌活性代谢途径,从而刺激了土壤环境中的应激反应。虽然病原真菌 N. oryzae 的接种富集了巴西根瘤菌并提高了土壤尿素酶活性,但对大豆的生物量和氮含量没有显著影响。最后,寄主壁龛的细菌群落组成存在差异,大多数固氮菌聚集在内圈,而根瘤菌只在内圈被检测到:我们的研究结果表明,AMF、相关核心真菌和大豆根相关生态位之间错综复杂的相互作用共同调节着酸性土壤中大豆的生长、根圈土壤养分的动态以及根相关微生物群的组成、功能和代谢。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Unveiling the hidden world: How arbuscular mycorrhizal fungi and its regulated core fungi modify the composition and metabolism of soybean rhizosphere microbiome.

Background: The symbiosis between arbuscular mycorrhizal fungi (AMF) and plants often stimulates plant growth, increases agricultural yield, reduces costs, thereby providing significant economic benefits. AMF can also benefit plants through affecting the rhizosphere microbial community, but the underlying mechanisms remain unclear. Using Rhizophagus intraradices as a model AMF species, we assessed how AMF influences the bacterial composition and functional diversity through 16 S rRNA gene sequencing and non-targeted metabolomics analysis in the rhizosphere of aluminum-sensitive soybean that were inoculated with pathogenic fungus Nigrospora oryzae and phosphorus-solubilizing fungus Talaromyces verruculosus in an acidic soil.

Results: The inoculation of R. intraradices, N. oryzae and T. verruculosus didn't have a significant influence on the levels of soil C, N, and P, or various plant characteristics such as seed weight, crude fat and protein content. However, their inoculation affected the structure, function and nutrient dynamics of the resident bacterial community. The co-inoculation of T. verruculosus and R. intraradices increased the relative abundance of Pseudomonas psychrotolerans, which was capable of N-fixing and was related to cry-for-help theory (plants signal for beneficial microbes when under stress), within the rhizosphere. R. intraradices increased the expression of metabolic pathways associated with the synthesis of unsaturated fatty acids, which was known to enhance plant resistance under adverse environmental conditions. The inoculation of N. oryzae stimulated the stress response inside the soil environment by enriching the polyene macrolide antifungal antibiotic-producing bacterial genus Streptomyces in the root endosphere and upregulating two antibacterial activity metabolic pathways associated with steroid biosynthesis pathways in the rhizosphere. Although inoculation of pathogenic fungus N. oryzae enriched Bradyrhizobium and increased soil urease activity, it had no significant effects on biomass and N content of soybean. Lastly, the host niches exhibited differences in the composition of the bacterial community, with most N-fixing bacteria accumulating in the endosphere and Rhizobium vallis only detected in the endosphere.

Conclusions: Our findings demonstrate that intricate interactions between AMF, associated core fungi, and the soybean root-associated ecological niches co-mediate the regulation of soybean growth, the dynamics of rhizosphere soil nutrients, and the composition, function, and metabolisms of the root-associated microbiome in an acidic soil.

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来源期刊
Environmental Microbiome
Environmental Microbiome Immunology and Microbiology-Microbiology
CiteScore
7.40
自引率
2.50%
发文量
55
审稿时长
13 weeks
期刊介绍: Microorganisms, omnipresent across Earth's diverse environments, play a crucial role in adapting to external changes, influencing Earth's systems and cycles, and contributing significantly to agricultural practices. Through applied microbiology, they offer solutions to various everyday needs. Environmental Microbiome recognizes the universal presence and significance of microorganisms, inviting submissions that explore the diverse facets of environmental and applied microbiological research.
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