The ISME Journal最新文献

Impacts of ectomycorrhizal forest change on nutrient cycling, forest resilience, and ecosystem services 外生菌根林变化对养分循环、森林恢复力和生态系统服务的影响

The ISME Journal Pub Date : 2026-04-25 DOI: 10.1093/ismejo/wrag103

Martin I Bidartondo, Sietse van der Linde, Carrie Andrew, Gaby Deckmyn, Guillaume Delhaye, Omar Flores, Jill Kowal, Thomas W Kuyper, Laura M Suz

{"title":"Impacts of ectomycorrhizal forest change on nutrient cycling, forest resilience, and ecosystem services","authors":"Martin I Bidartondo, Sietse van der Linde, Carrie Andrew, Gaby Deckmyn, Guillaume Delhaye, Omar Flores, Jill Kowal, Thomas W Kuyper, Laura M Suz","doi":"10.1093/ismejo/wrag103","DOIUrl":"https://doi.org/10.1093/ismejo/wrag103","url":null,"abstract":"At a time when we count on northern hemisphere forests to mitigate global atmospheric change, European forests are showing deteriorating aboveground nutritional trends without a mechanistic, causal explanation. The increasingly recognised roles of ectomycorrhizal (EM) fungi in global carbon (C), nitrogen (N) and phosphorus (P) cycling mean there is a need to understand dynamics in changing EM forests, particularly at large scales over time. Achieving this requires integrating soil microbial biology with long-term forest monitoring, and a fundamental distributional, temporal and mechanistic understanding of key soil organisms and the plasticity of their traits across gradients. We postulate that changing abundances of ectomycorrhizas with different capabilities for delivering mineral nutrients from soil to trees, and for storing or releasing soil C, can explain what is happening with forest nutrition, and thus should be included in future models of forest nutrient cycling, above and belowground. Here we discuss the state-of-the-art regarding data needs, focussing on environmental change, large-scale spatial and temporal dynamics, experimentation, modelling and monitoring. Linking understanding of tree nutritional status with the potential of forests to cope with environmental change, for instance, anthropogenic carbon and N fertilisation of the biosphere leading to P limitation, holds significant potential to inform management and policy of forests and soils for promoting resilient ecosystems.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147739671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Iron limitation promotes metabolic cross-feeding between cheese ripening bacteria. 铁的限制促进了奶酪成熟细菌之间的代谢交叉喂养。

The ISME Journal Pub Date : 2026-04-24 DOI: 10.1093/ismejo/wrag100

Rina Mekuli,Dominique Swennen,Jean-Michel Camadro,Sophie Landaud,Vincent Hervé

{"title":"Iron limitation promotes metabolic cross-feeding between cheese ripening bacteria.","authors":"Rina Mekuli,Dominique Swennen,Jean-Michel Camadro,Sophie Landaud,Vincent Hervé","doi":"10.1093/ismejo/wrag100","DOIUrl":"https://doi.org/10.1093/ismejo/wrag100","url":null,"abstract":"Iron is a limiting micronutrient in various environments, and its scarcity orchestrates microbial interactions across diverse ecosystems. The cheese surface, which is oxic, iron-limited, and a host of moderately complex ecosystems, can serve as a model system to study iron-mediated microbial interactions. In this work, we focused on two ripening bacteria isolated from cheese, Hafnia alvei and Brevibacterium aurantiacum. We combine growth measurements, transcriptomics, proteomics, and metabolomics to examine the role of iron in their interactions within a synthetic medium designed to mimic late cheese-ripening conditions, using mono and coculture systems under iron limitation. Coculturing resulted in significant differences in the physiology of both strains, with a more notable effect on H. alvei. H. alvei, the only siderophore producer of the two, appeared to experience iron limitation in the coculture. This is partially attributed to sharing siderophores, and thus, iron, with B. aurantiacum. Multi-omics analysis points to several key exchanges. First, putrescine acts as a cross-fed metabolite, where B. aurantiacum synthesizes it and H. alvei uses it as an energy source. Next, we found evidence for the activity of quorum sensing and potential quorum quenching mechanisms, previously implicated in siderophore biosynthesis. Additionally, coculturing led to increased production of volatile sulfur compounds, contributing to positive organoleptic characteristics of cheese. Our model system reveals the modifications of C, N, S metabolisms in response to an abiotic stress and provides a framework to study such responses in numerous iron-limited ecosystems.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147735250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineered kin recognition specificities in the TraA cell surface receptor TraA细胞表面受体的基因工程亲缘识别特异性

The ISME Journal Pub Date : 2026-04-23 DOI: 10.1093/ismejo/wrag102

Tingting Guo, Daniel Wall

{"title":"Engineered kin recognition specificities in the TraA cell surface receptor","authors":"Tingting Guo, Daniel Wall","doi":"10.1093/ismejo/wrag102","DOIUrl":"https://doi.org/10.1093/ismejo/wrag102","url":null,"abstract":"Recognizing self-versus nonself is a crucial step in the development of multicellularity. The social bacterium Myxococcus xanthus is a tractable model organism for studying this transition from single-cell to multicellular life. The polymorphic cell-surface receptor TraA directs cooperative behaviors toward kin. TraA is a highly specific receptor, capable of recognizing other TraA proteins with identical or nearly identical sequences by homotypic binding, but the molecular basis of this specificity remains poorly understood. Here, we generated a targeted TraA mutant library comprising thousands of variants with substitutions at 10 predicted specificity-determining residues. Screening revealed variants with altered recognition profiles, often resulting in promiscuous and/or heterotypic TraA-TraA interactions. We further identified key residues that govern specificity, as substitutions at these positions rewired recognition outcomes. Finally, we propose an evolutionary model in which new TraA specificities arise through promiscuous intermediate states shaped by reward-punishment dynamics. Together, these findings demonstrate the malleability of TraA specificity and provide molecular and evolutionary insight into social recognition.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Taxonomy, tissue, and habitat influence mollusc microbial communities. 分类、组织和生境影响软体动物微生物群落。

The ISME Journal Pub Date : 2026-04-22 DOI: 10.1093/ismejo/wrag092

Diana Carolina Vergara-Florez,Thomas F Duda

{"title":"Taxonomy, tissue, and habitat influence mollusc microbial communities.","authors":"Diana Carolina Vergara-Florez,Thomas F Duda","doi":"10.1093/ismejo/wrag092","DOIUrl":"https://doi.org/10.1093/ismejo/wrag092","url":null,"abstract":"Microbes play a crucial role in the health, development, and resilience of molluscs, yet the ecological and evolutionary factors shaping their microbial communities remain poorly understood. To uncover the drivers of microbial community composition of molluscs, we conducted a systematic review of 85 studies, including 45 on bivalves from marine and freshwater habitats; 33 on gastropods from marine, freshwater, and terrestrial habitats; and seven on cephalopods. Our synthesis reveals that both intrinsic (e.g., host phylogeny, tissue type) and extrinsic (e.g., environment, geography, and seasonality) factors influence microbial community structure, but the effects are highly taxon- and context-dependent. Although studies of bivalves often emphasize environmental drivers, those of cephalopods more frequently highlight intrinsic host features. Despite growing interest in molluscan microbiomes, we identified significant taxonomic and methodological biases, including a predominant focus on economically important species and gut tissues. We advocate for a broader, integrative approach that includes underrepresented molluscan groups, diverse tissue types, and testing of both intrinsic and extrinsic variables across spatial and temporal gradients. This review highlights the need for standardized, multi-factorial research to better understand and predict microbial community responses to environmental change of one of the most diverse and ecologically important invertebrate phyla.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147731496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanoplastics interfere with plant-mycorrhizal communication and limit plant growth 纳米塑料干扰植物与菌根的交流，限制植物生长

The ISME Journal Pub Date : 2026-04-22 DOI: 10.1093/ismejo/wrag101

Han Hao Li, Xun Wen Chen, Ming Ge Xing, Yong Xi Zhao, Miao Miao Zhang, Quan Ying Cai, Hui Li

{"title":"Nanoplastics interfere with plant-mycorrhizal communication and limit plant growth","authors":"Han Hao Li, Xun Wen Chen, Ming Ge Xing, Yong Xi Zhao, Miao Miao Zhang, Quan Ying Cai, Hui Li","doi":"10.1093/ismejo/wrag101","DOIUrl":"https://doi.org/10.1093/ismejo/wrag101","url":null,"abstract":"More than 80% of land plants form symbiotic relationships with arbuscular mycorrhizal (AM) fungi for nutrient uptake. As emerging soil pollutants, nanoplastics (NPs) accumulate in both crop and AM fungal tissue, posing non-negligible toxicity and health risks. However, whether and how NPs can impact plant-AM fungal partnership throughout the symbiotic process remains poorly understood. Here, using axenic root-fungal culture, fluorescence NP tracking, and real-time symbiotic signal monitoring, we show that during pre-colonization phase, NPs reduced spore germination rates (−48%) due to the NP accumulation on spore surface, hindering symbiotic signal perception. During the colonization phase, NPs entered fungal cells, disrupted organelles, and accelerated hyphal senescence, consequently reducing hyphal branching length (−22%) and secondary spore production (−32%). In real-world soil, inoculation of secondary spores (reproduced under NPs) formed fewer arbuscule structures (−46%) within maize roots with reduced carbon allocation to AM fungus, leading to lower hyphal length density (HLD) (−24%). During the post-colonization phase, lower HLD impaired the well-known function of phosphorus (P) mineralization by hyphae-enriched bacteria, reduced soil available P (−5.7%) and maize shoot P (−20%), eventually resulting in compromised plant performance. Our findings reveal an integrated yet largely underexplored mechanism of how NPs hinder plant performance by disrupting the dynamic relationship between plants and their symbiotic partners. In a broader context, understanding the alteration of plant-microbial interaction (rather than separately) under emerging stress can provide ecologically relevant implications for sustaining agricultural and terrestrial ecosystems.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting microbial community responses to disturbance using genome-resolved trait-based life-history strategies 利用基于基因组解析性状的生活史策略预测微生物群落对干扰的反应

The ISME Journal Pub Date : 2026-04-22 DOI: 10.1093/ismejo/wrag099

Ezequiel Santillan, Soheil A Neshat, Stefan Wuertz

{"title":"Predicting microbial community responses to disturbance using genome-resolved trait-based life-history strategies","authors":"Ezequiel Santillan, Soheil A Neshat, Stefan Wuertz","doi":"10.1093/ismejo/wrag099","DOIUrl":"https://doi.org/10.1093/ismejo/wrag099","url":null,"abstract":"Understanding how microbial communities respond to disturbance remains a fundamental question in ecology, with broad implications for biodiversity, ecosystem function, and biotechnology. Trait-based approaches offer general rules to predict community responses by linking ecological strategies to measurable traits. Whereas life-history strategy frameworks such as the competitor–ruderal–stress-tolerant (CSR) model are well established in plant and animal ecology, their application to microbial communities has been limited. Here, we experimentally tested how microbial communities shift across a gradient of disturbance frequency in replicated bioreactors treating synthetic wastewater. We applied six conditions by doubling the organic loading rate at different frequencies, from undisturbed to press disturbance, and monitored changes over 42 days using genome-resolved metagenomics, 16S rRNA gene sequencing, biomass quantification, and effluent chemistry. By integrating ordination, network analysis, and machine learning, we identified emergent community-level life-history strategies, with competitor-dominated communities under undisturbed conditions, ruderal-associated strategies at intermediate disturbance frequencies, and stress-tolerant strategies under sustained high-frequency (press) disturbance. These strategies were reflected in functional trade-offs, shifts in community composition, and genomic trait distributions. A simulation-based approach was used to generate a CSR classification of metagenome-assembled genomes, which was consistent with patterns observed in other microbial ecosystems. Our results demonstrate that life-history frameworks can capture predictable microbial dynamics across disturbance regimes. This approach provides a unifying tool for linking microbial structure, function, and traits across scales, helping to reconcile ecological theory with microbial resource management in natural and engineered ecosystems.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"141 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metabolic potential structures gill symbiont communities in two common shipworm species 代谢势对两种常见船虫鳃共生体群落的影响

The ISME Journal Pub Date : 2026-04-22 DOI: 10.1093/ismejo/wrag089

Ron Flatau, Carson D Bickley, Marvin A Altamia, Mark T Gasser, Daniel L Distel

{"title":"Metabolic potential structures gill symbiont communities in two common shipworm species","authors":"Ron Flatau, Carson D Bickley, Marvin A Altamia, Mark T Gasser, Daniel L Distel","doi":"10.1093/ismejo/wrag089","DOIUrl":"https://doi.org/10.1093/ismejo/wrag089","url":null,"abstract":"Shipworms (Bivalvia: Teredinidae) are the most prolific wood consumers in marine environments. These wormlike marine bivalves digest wood using carbohydrate-active enzymes (CAZymes) produced by intracellular bacterial endosymbionts housed within their gills. Although several shipworm species are known to host multiple co-occurring symbiont species, the factors that influence symbiont community assembly, including the phylogenetic identity and metabolic capabilities of the symbionts, remain poorly understood. We sequenced gill symbiont metagenomes from multiple specimens of two shipworm species, Teredo bartschi (22 specimens) and Lyrodus pedicellatus (14 specimens), which have sympatric distribution in the wild, and which were reared together in laboratory co-culture. From these metagenomes, we assembled 90 metagenome-assembled genomes (MAGs) representing seven distinct symbiont species. The metagenome of each host specimen contained between 1 and 5 symbiont species, with each including at least one nitrogen-fixing symbiont. Six of the seven identified symbiont species were found in both host species, demonstrating a lack of host species specificity in these symbioses. We identified patterns of symbiont occurrence and co-occurrence in these two hosts and used these patterns to constrain the core set of CAZyme and nitrogen-fixation gene classes necessary to support host survival. Our results indicate that, in these two host species, symbiont community composition reflects the symbionts’ capabilities for carbohydrate degradation and nitrogen fixation, rather than strict species-specific mechanisms of host and symbiont sorting.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Conserved glycan-utilization strategies shape Akkermansiaceae success across aquatic and gut ecosystems. 保守的聚糖利用策略塑造了Akkermansiaceae在水生和肠道生态系统中的成功。

The ISME Journal Pub Date : 2026-04-22 DOI: 10.1093/ismejo/wrag096

Isabella Wilkie,Nicole Von Possel,Tomás Sauma-Sánchez,Greta Reintjes,Luis H Orellana

{"title":"Conserved glycan-utilization strategies shape Akkermansiaceae success across aquatic and gut ecosystems.","authors":"Isabella Wilkie,Nicole Von Possel,Tomás Sauma-Sánchez,Greta Reintjes,Luis H Orellana","doi":"10.1093/ismejo/wrag096","DOIUrl":"https://doi.org/10.1093/ismejo/wrag096","url":null,"abstract":"Elucidating interaction mechanisms and substrate specialization is central to understanding bacterial adaptation across ecological niches. Specialized mucin-degrading bacteria of the genus Akkermansia are widely recognized for their beneficial roles in the human gut, yet it remains unclear whether this specialization is unique to the gut or reflects a conserved ecological strategy across different hosts and environments. Here, we show that members of the family Akkermansiaceae share a deeply conserved genetic and mechanistic framework enabling colonization across gut and aquatic ecosystems. Comparative genomics of Akkermansiaceae representatives revealed niche-specific gene repertoires tightly adapted to substrate source and availability. Marine representatives encode distinct combinations of CAZymes and comparatively expanded sulfatase repertoires that enable the degradation of sulfated polysaccharides such as fucoidan, a recalcitrant substrate linked to carbon sequestration. Structural predictions and comparisons identified a conserved molecular system centered on a type IV-like pilus that mediates attachment to complex, fucose-rich glycans. The genes underlying this system are syntenic with the recently described mucin utilization locus in Akkermansia muciniphila, revealing an evolutionary continuity between aquatic and gut lineages. Seawater incubations with fluorescently labeled substrates confirmed fucoidan uptake and degradation by marine Akkermansiaceae. Together, these results reveal a unified glycan-utilization strategy spanning the environmental breadth of Akkermansiaceae and provide a mechanistic framework linking ecological success in marine environments to traits associated with probiotic functions in the human gut.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147731497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Emergent symbiont strains provide thermally robust protection against co-evolved and novel parasitoids of introduced pea aphids. 新出现的共生菌株对引进的豌豆蚜虫的共同进化和新的寄生物提供了热稳健的保护。

The ISME Journal Pub Date : 2026-04-17 DOI: 10.1093/ismejo/wrag098

Vilas Patel,Roy A Kucuk,Benjamin R Haines-Eitzen,Jacob A Russell,Kerry M Oliver

{"title":"Emergent symbiont strains provide thermally robust protection against co-evolved and novel parasitoids of introduced pea aphids.","authors":"Vilas Patel,Roy A Kucuk,Benjamin R Haines-Eitzen,Jacob A Russell,Kerry M Oliver","doi":"10.1093/ismejo/wrag098","DOIUrl":"https://doi.org/10.1093/ismejo/wrag098","url":null,"abstract":"Climate change and biological invasions pose synergistic threats; however, organisms may rapidly adapt through microbial symbiosis. We investigated how defensive symbionts in invasive pea aphids, Acyrthosiphon pisum, respond to emerging threats. Previously rare strains of the protective symbiont Hamiltonella defensa increased from <0.5% to 58% in aphid populations over just a few years. Bioassays revealed that these strains confer reciprocal, enemy-specific defences. One strain (C11) protected against Praon pequodorum, a native parasitoid that only began attacking pea aphids post-introduction, but provided no defence against the co-evolved parasitoid Aphidius ervi. Conversely, a closely related strain (C9) protected strongly against A. ervi but not P. pequodorum. When the APSE bacteriophage was spontaneously lost from H. defensa C11 during cultivation, protection against P. pequodorum was completely eliminated, experimentally confirming the essential role of phage-encoded defences. Cultivation-assisted genomic analyses implicate divergent phage virulence cassettes in enemy-targeted defence, creating complementary protection portfolios within populations. The modular architecture of APSE phages enables rapid acquisition of novel capabilities through horizontal gene transfer. Critically, both strains maintained robust anti-parasitoid defence under simulated heatwave conditions, in contrast to previous findings in which modest temperature increases disabled protection in other H. defensa strains. Our findings demonstrate the potential for heritable symbionts to provide rapid adaptive responses to anthropogenic stressors within ecological timescales, representing a widespread mechanism for host persistence under accelerating global change and having important implications for biological control and ecosystem management.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Resource allocation to pea plant nodules impacted by nitrogen fixation potential of infecting rhizobia. 根瘤菌侵染对豌豆根瘤资源分配的影响

The ISME Journal Pub Date : 2026-04-17 DOI: 10.1093/ismejo/wrag097

Thomas J Underwood,Philip S Poole

{"title":"Resource allocation to pea plant nodules impacted by nitrogen fixation potential of infecting rhizobia.","authors":"Thomas J Underwood,Philip S Poole","doi":"10.1093/ismejo/wrag097","DOIUrl":"https://doi.org/10.1093/ismejo/wrag097","url":null,"abstract":"Legumes host nitrogen-fixing bacteria, called rhizobia, within specialised root structures called nodules, where carbon from the plant is exchanged for ammonia fixed from N2 by the bacteria. Legumes can host multiple bacterial strains at the same time, that vary in their fixation effectiveness, but legumes sanction nodules containing less effectively fixing strains by reducing the provision of nutrients. Understanding how sanctions are applied by plants and how bacteria may try to avoid them is important for understanding the stability of legume-rhizobial symbioses. Using near isogenic Rhizobium leguminosarum strains, on pea, we demonstrate that sanctions are sensitive to the proportion of nodules occupied by a less effective strain and by using split roots show that sanctions are applied based on a global comparison of nodules across the plant's root system. By using several rhizobia with different levels of fixation, but all derived from the same parent, we show that pea plants can differentiate between bacteria with relatively small variations in fixation effectiveness. We demonstrate that peas integrate global signals to determine whether individual nodules are sanctioned. At the same time these results show that poorly fixing strains can avoid sanctions if they dominate nodulation.","PeriodicalId":516554,"journal":{"name":"The ISME Journal","volume":"142 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2026-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147695213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0