Rhizosphere-colonizing bacteria persist in the protist microbiome.

IF 3.7 2区 生物学 Q2 MICROBIOLOGY
mSphere Pub Date : 2025-05-27 Epub Date: 2025-04-30 DOI:10.1128/msphere.00037-25
Stephen J Taerum, Ravikumar R Patel, Justin E Alamo, Daniel Gage, Blaire Steven, Lindsay R Triplett
{"title":"Rhizosphere-colonizing bacteria persist in the protist microbiome.","authors":"Stephen J Taerum, Ravikumar R Patel, Justin E Alamo, Daniel Gage, Blaire Steven, Lindsay R Triplett","doi":"10.1128/msphere.00037-25","DOIUrl":null,"url":null,"abstract":"<p><p>Soils contain diverse predatory protists that affect the abundance and behavior of rhizosphere bacteria, including bacteria that may benefit plant health. Protists harbor their own bacterial microbiomes, and we previously observed that plants inoculated with protists harbored rhizosphere bacteria similar to those in the protist inoculum. To determine how protist microbiomes affect the rhizosphere, we profiled the bacteria of eight diverse rhizosphere protist isolates after 2 years of laboratory culture. We then compared the protist culture microbiomes to maize rhizosphere communities 6 weeks after protist inoculation. Introduction of protists enriched 13 protist-associated bacterial amplicon sequence variants (ASVs) in the rhizosphere, which comprised ~10% of the rhizosphere bacterial community. Additional bacterial ASVs ranked highly in abundance in both rhizosphere (top 100) and protist (top 20) microbiomes; together, a median 47% of the protist microbiome was enriched or in high rank abundance in the rhizosphere. Inoculation with three out of eight protist cultures positively affected root biomass traits, but a protist mixture had no effect, indicating that the impact of protist-associated bacteria on plant growth is context dependent. Isolates of protist-associated bacteria had both positive and negative effects on protist growth in culture, suggesting that the bacteria use multiple strategies to survive in proximity to predators. This study demonstrates that even after long-term laboratory culture, rhizosphere protist cultures host bacteria that can colonize the rhizosphere of maize. The findings also identify diverse groups of rhizosphere-colonizing bacteria that persist among protist predators, which suggests that these bacteria could associate with or benefit from protists in the soil.</p><p><strong>Importance: </strong>Understanding the impact of predatory protists on the plant microbiome will be essential to deploy protists in sustainable agriculture. This study shows that eight rhizosphere protist isolates hosted diverse and distinct bacterial communities and that a large proportion of these bacteria could be found colonizing the maize root environment 6 weeks after protists were inoculated onto seedlings. This study demonstrates that certain bacteria from the maize rhizosphere can persist for years in protist cultures and retain the ability to colonize rhizosphere soil, suggesting that protists might support the survival of these rhizosphere bacteria in the absence of the plant.</p>","PeriodicalId":19052,"journal":{"name":"mSphere","volume":" ","pages":"e0003725"},"PeriodicalIF":3.7000,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12108058/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"mSphere","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1128/msphere.00037-25","RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/4/30 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"MICROBIOLOGY","Score":null,"Total":0}
引用次数: 0

Abstract

Soils contain diverse predatory protists that affect the abundance and behavior of rhizosphere bacteria, including bacteria that may benefit plant health. Protists harbor their own bacterial microbiomes, and we previously observed that plants inoculated with protists harbored rhizosphere bacteria similar to those in the protist inoculum. To determine how protist microbiomes affect the rhizosphere, we profiled the bacteria of eight diverse rhizosphere protist isolates after 2 years of laboratory culture. We then compared the protist culture microbiomes to maize rhizosphere communities 6 weeks after protist inoculation. Introduction of protists enriched 13 protist-associated bacterial amplicon sequence variants (ASVs) in the rhizosphere, which comprised ~10% of the rhizosphere bacterial community. Additional bacterial ASVs ranked highly in abundance in both rhizosphere (top 100) and protist (top 20) microbiomes; together, a median 47% of the protist microbiome was enriched or in high rank abundance in the rhizosphere. Inoculation with three out of eight protist cultures positively affected root biomass traits, but a protist mixture had no effect, indicating that the impact of protist-associated bacteria on plant growth is context dependent. Isolates of protist-associated bacteria had both positive and negative effects on protist growth in culture, suggesting that the bacteria use multiple strategies to survive in proximity to predators. This study demonstrates that even after long-term laboratory culture, rhizosphere protist cultures host bacteria that can colonize the rhizosphere of maize. The findings also identify diverse groups of rhizosphere-colonizing bacteria that persist among protist predators, which suggests that these bacteria could associate with or benefit from protists in the soil.

Importance: Understanding the impact of predatory protists on the plant microbiome will be essential to deploy protists in sustainable agriculture. This study shows that eight rhizosphere protist isolates hosted diverse and distinct bacterial communities and that a large proportion of these bacteria could be found colonizing the maize root environment 6 weeks after protists were inoculated onto seedlings. This study demonstrates that certain bacteria from the maize rhizosphere can persist for years in protist cultures and retain the ability to colonize rhizosphere soil, suggesting that protists might support the survival of these rhizosphere bacteria in the absence of the plant.

根际定殖细菌持续存在于原生微生物群中。
土壤中含有多种掠食性原生生物,它们影响根际细菌的丰度和行为,包括可能有益于植物健康的细菌。原生生物拥有自己的细菌微生物群,我们以前观察到接种原生生物的植物拥有与原生生物接种物相似的根际细菌。为了确定原生生物微生物群如何影响根际,我们在实验室培养2年后对8种不同根际原生生物分离株的细菌进行了分析。然后,我们比较了原生生物接种后6周原生生物培养与玉米根际微生物群落。原生生物的引入使根际细菌扩增子序列变异(asv)增加了13个,占根际细菌群落的10%左右。其他细菌性asv在根际(前100名)和原生生物(前20名)微生物群中的丰度都很高;总的来说,根际中有47%的原生微生物组富集或高丰度。接种8种原生菌培养物中的3种对根系生物量性状有积极影响,但原生菌混合物对根系生物量性状没有影响,这表明原生菌相关细菌对植物生长的影响是依赖于环境的。分离的原生生物相关细菌对培养的原生生物生长既有积极的影响,也有消极的影响,这表明细菌使用多种策略在靠近捕食者的地方生存。这项研究表明,即使经过长期的实验室培养,根际原生生物培养的宿主细菌也可以在玉米根际定殖。研究结果还确定了在原生生物捕食者中存在的不同群体的根际定殖细菌,这表明这些细菌可能与土壤中的原生生物相关或受益。重要性:了解掠夺性原生生物对植物微生物组的影响对于在可持续农业中部署原生生物至关重要。本研究表明,8株根际原生生物分离株拥有多种不同的细菌群落,并且在原生生物接种到幼苗上6周后,这些细菌中的很大一部分可以在玉米根环境中定植。该研究表明,来自玉米根际的某些细菌可以在原生培养物中存活数年,并保留定殖根际土壤的能力,这表明原生生物可能在植物缺失的情况下支持这些根际细菌的生存。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
mSphere
mSphere Immunology and Microbiology-Microbiology
CiteScore
8.50
自引率
2.10%
发文量
192
审稿时长
11 weeks
期刊介绍: mSphere™ is a multi-disciplinary open-access journal that will focus on rapid publication of fundamental contributions to our understanding of microbiology. Its scope will reflect the immense range of fields within the microbial sciences, creating new opportunities for researchers to share findings that are transforming our understanding of human health and disease, ecosystems, neuroscience, agriculture, energy production, climate change, evolution, biogeochemical cycling, and food and drug production. Submissions will be encouraged of all high-quality work that makes fundamental contributions to our understanding of microbiology. mSphere™ will provide streamlined decisions, while carrying on ASM''s tradition for rigorous peer review.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信