Molecular Plant-microbe Interactions最新文献

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A Clubroot Pathogen PBS3-Like Effector Manipulates Hormonal Crosstalk to Alter Root Morphology in Arabidopsis and Canola. 一种棒根病原菌pbs3样效应物操纵激素串扰改变拟南芥和油菜的根形态。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-08-25 DOI: 10.1094/MPMI-05-26-0045-R
Melaine Gonzalez-Garcia, Jiaxu Wu, Marina Silvestre Vañó, Soham Mukhopadhyay, Elisa Fantino, Robert Malinowski, Karolina Stefanowicz, Ian Major, Edel Pérez-Lopez
{"title":"A Clubroot Pathogen PBS3-Like Effector Manipulates Hormonal Crosstalk to Alter Root Morphology in Arabidopsis and Canola.","authors":"Melaine Gonzalez-Garcia, Jiaxu Wu, Marina Silvestre Vañó, Soham Mukhopadhyay, Elisa Fantino, Robert Malinowski, Karolina Stefanowicz, Ian Major, Edel Pérez-Lopez","doi":"10.1094/MPMI-05-26-0045-R","DOIUrl":"10.1094/MPMI-05-26-0045-R","url":null,"abstract":"<p><p><i>Plasmodiophora brassicae</i>, the causal agent of clubroot disease, actively manipulates host hormone pathways to promote infection. Previous studies identified <i>PbGH<sub>3</sub></i> as a putative GH3-like effector with in vitro auxin-conjugating activity, although its biological function in planta was investigated but remained unresolved. Here, we studied the role of PbGH3 during host colonization using <i>PbGH<sub>3</sub></i>-overexpressing <i>Arabidopsis thaliana</i> and <i>Brassica napus</i> lines. PbGH3 overexpression induced conserved developmental phenotypes in both species, including epinastic leaves, reduced apical dominance, enhanced lateral branching, and increased root hair formation, consistent with altered hormone balance. However, hormone profiling and exogenous auxin assays did not support a role for PbGH3 as a canonical auxin-conjugating enzyme in planta. Instead, structural analyses revealed a strong similarity between PbGH3 and the Arabidopsis clade III GH3 proteins GH3.12/PBS3 and GH3.7, which are associated with salicylic acid (SA) metabolism. Consistent with this observation, loss of GH3.12/PBS3 increased susceptibility to clubroot, whereas expression of <i>PbGH<sub>3</sub></i> in the gh3.12 mutant background partially restored SA accumulation and reduced disease susceptibility. <i>PbGH<sub>3</sub></i> expression peaked during the early stages of infection, and overexpressing lines displayed enhanced root hair colonization by <i>P</i>. <i>brassicae</i>, suggesting a role during primary infection rather than later gall development. Together, our results support a model in which PbGH3 modulates SA-associated hormonal crosstalk and root morphology that could be harnessed by the clubroot pathogen to ensure host colonization. These findings provide new insight into how <i>P</i>. <i>brassicae</i> manipulates host hormone homeostasis during infection. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"MPMI05260045R"},"PeriodicalIF":3.9,"publicationDate":"2026-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148631005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pathogen Species-Specific Differences in Induction of the Maize Polyubiquitin Gene Promoter in Transgenic Wheat. 玉米多泛素基因启动子在转基因小麦上诱导的病原菌种特异性差异。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 Epub Date: 2026-07-22 DOI: 10.1094/MPMI-12-25-0174-R
Saeid Babaei, Neil Smith, Chunhong Chen, Dhara Bhatt, Brenton Brooks, Jian Chen, Joshua Philips, Rohit Mago, Ming-Bo Wang, Ming Luo, Michael Ayliffe
{"title":"Pathogen Species-Specific Differences in Induction of the Maize Polyubiquitin Gene Promoter in Transgenic Wheat.","authors":"Saeid Babaei, Neil Smith, Chunhong Chen, Dhara Bhatt, Brenton Brooks, Jian Chen, Joshua Philips, Rohit Mago, Ming-Bo Wang, Ming Luo, Michael Ayliffe","doi":"10.1094/MPMI-12-25-0174-R","DOIUrl":"10.1094/MPMI-12-25-0174-R","url":null,"abstract":"<p><p>The maize polyubiquitin promoter (<i>ZmUbi</i>) is a mainstay in molecular biology for transgene expression and is used for constitutive expression of defense-related gene products. Transgenic wheat lines were produced expressing a <i>ZmUbi-RUBY</i> reporter gene that produces the red pigment betalain. Some lines showed transgene silencing with reduced <i>RUBY</i> transcript accumulation and chimeric sectors of betalain. Infection of these plants with <i>Blumeria graminis</i>, <i>Puccinia graminis</i> f. sp. <i>tritici</i> (<i>Pgt</i>), or <i>P. triticina</i> (<i>Pt</i>) each resulted in localized betalain accumulation at infection sites and increased <i>RUBY</i> transcript accumulation. In contrast, two isolates of <i>P. striiformis</i> f. sp. <i>tritici</i> (<i>Pst</i>) caused no detectable <i>RUBY</i> transcript accumulation and no visible betalain accumulation at infection sites, although a modest betalain increase was detected in infected tissue extracts. Compared with <i>Pst</i>, <i>Pgt</i> more strongly induced host genes involved in transcriptional and post-transcriptional regulatory processes, although no obvious pathogen-induced changes in <i>ZmUbi</i> promoter methylation were observed. <i>ZmUbi-GUS</i> transgenic wheat plants were also pathogen challenged, and, unlike <i>Pst</i>, both <i>Pgt</i> and <i>Pt</i> induced localized <i>GUS</i> staining at infection sites. Database mining showed that the endogenous maize polyubiquitin gene from which <i>ZmUbi</i> is derived was pathogen inducible, albeit in a species-specific fashion. These pathogen differences in <i>ZmUbi</i> induction have implications when using this regulatory element to express defense-related transgenes in wheat. Comparing the resistance efficacy of transgenes against different pathogens using this promoter is potentially influenced by significant, localized expression differences occurring at infection sites of different pathogen species. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"607-620"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148138606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unmasking the Multifunctional 8K Protein: How Potato Mop-Top Virus Reprograms Host Transcriptomes and Evades Chloroplast-Mediated Immunity. 揭开多功能8K蛋白的面纱:马铃薯拖顶病毒如何重编程宿主转录组并逃避叶绿体介导的免疫。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 DOI: 10.1094/MPMI-06-26-0058-CM
Ved Prakash
{"title":"Unmasking the Multifunctional 8K Protein: How Potato Mop-Top Virus Reprograms Host Transcriptomes and Evades Chloroplast-Mediated Immunity.","authors":"Ved Prakash","doi":"10.1094/MPMI-06-26-0058-CM","DOIUrl":"https://doi.org/10.1094/MPMI-06-26-0058-CM","url":null,"abstract":"","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":"39 4","pages":"558-559"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148887492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rs_MEP1 Is Required for the Pathogenesis of Rhizoctonia solani AG1-IA in Plants. Rs_MEP1是植物枯丝核菌AG1-IA发病的必需基因。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 Epub Date: 2026-08-25 DOI: 10.1094/MPMI-01-26-0007-R
Amrita Pradhan, Debashis Sahoo, Vikrant Bhati, Rahul Kumar, Rajni Yadav, Srayan Ghosh, Prashant Anupama-Mohan Pawar, Gopaljee Jha
{"title":"<i>Rs_MEP1</i> Is Required for the Pathogenesis of <i>Rhizoctonia solani</i> AG1-IA in Plants.","authors":"Amrita Pradhan, Debashis Sahoo, Vikrant Bhati, Rahul Kumar, Rajni Yadav, Srayan Ghosh, Prashant Anupama-Mohan Pawar, Gopaljee Jha","doi":"10.1094/MPMI-01-26-0007-R","DOIUrl":"10.1094/MPMI-01-26-0007-R","url":null,"abstract":"<p><p><i>Rhizoctonia solani</i> AG1-IA is a polyphagous necrotrophic fungal pathogen that causes sheath blight disease in rice. Efforts are being made to identify pathogenicity-associated genes in <i>R. solani</i> and modulate them to develop a disease control strategy. Here, we investigated the roles of some predicted pathogenicity-associated genes of <i>R. solani</i> that have previously been reported to be upregulated during infection in rice. The tobacco rattle virus-based host-induced gene silencing of the selected pathogenicity-associated genes revealed that silencing of <i>Rs_MEP1</i>, a zinc-containing Peptidase_M43 domain metalloprotease, severely compromises <i>R. solani</i> infection in tomato. Moreover, double-stranded RNA-mediated silencing of <i>Rs_MEP1</i> prevented <i>R. solani</i> infection in rice. The signal sequence trap assay indicated the secretory nature of Rs_MEP1, and the reporter assay suggested its localization in the plant apoplast. Notably, <i>Agrobacterium</i>-mediated transient overexpression of Rs_MEP1 induces necrotic cell death responses in plants. We provide evidence that <i>Rs_MEP1</i> interacts with the GH19 family of rice chitinases and potentially modulates their functions. Overall, our study emphasizes that <i>Rs_MEP1</i> facilitates <i>R. solani</i> in promoting necrotic responses and targets rice GH19 chitinases to impart disease susceptibility in plants. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"580-591"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148631030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Novel Approach to Engineering Tomato Spotted Wilt Virus Infectious Clones by Disarming Key Nodes in Antiviral Defenses. 解除番茄斑点枯萎病毒抗病毒防御关键节点工程克隆的新途径
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 Epub Date: 2026-08-14 DOI: 10.1094/MPMI-12-25-0176-R
Haden C Ball, Osama Atallah, Hernan Garcia-Ruiz, Caleb O Bedsole, Brian Shaw, Venura Herath, Jeanmarie Verchot
{"title":"A Novel Approach to Engineering Tomato Spotted Wilt Virus Infectious Clones by Disarming Key Nodes in Antiviral Defenses.","authors":"Haden C Ball, Osama Atallah, Hernan Garcia-Ruiz, Caleb O Bedsole, Brian Shaw, Venura Herath, Jeanmarie Verchot","doi":"10.1094/MPMI-12-25-0176-R","DOIUrl":"10.1094/MPMI-12-25-0176-R","url":null,"abstract":"<p><p>Tomato spotted wilt virus (TSWV) is an economically devastating pathogen that rapidly overcomes genetic resistance in major crops. Reverse genetic systems are crucial for investigating plant-virus interactions and resistance-breaking mechanisms, and developing these tools for segmented ambisense RNA viruses remains a crucial challenge. Current TSWV clones rely on extensively modified Asian isolates requiring co-delivery of multiple replication helpers and viral silencing suppressors. Streamlining these systems for regionally significant strains with minimal genetic alterations is essential. Here, we developed the first infectious clone of a U.S. TSWV isolate (PA01). Three binary plasmids contain cDNAs for the antigenomic L and S segments, as well as the genomic M segment, with enhanced GFP replacing NSs on the S segment. Co-delivery of the cucumovirus 2b alone or in combination with tombusvirus P19 or begomovirus AL2 achieved a high proportion of systemically infected <i>Nicotiana benthamiana</i> and <i>Capsicum annuum</i> plants. In <i>N. tabacum</i>, co-delivering the <i>Caenorhabditis elegans</i> cell death suppressor CED-9 or using <i>NahG</i> transgenic plants produced 30 to 33% systemically infected plants. Co-delivery of 2b boosted infection levels in <i>NahG</i> plants to 62%. These data indicate that in addition to the antiviral RNA-silencing machinery, additional host defense pathways influence TSWV rescue and systemic infection from cDNA. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"592-606"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148422387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Divergent Roles of CPK28 in Immune Homeostasis Across Land Plants. CPK28在陆地植物免疫稳态中的不同作用
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 Epub Date: 2026-07-21 DOI: 10.1094/MPMI-02-26-0020-SC
Ruoqi Dou, Baptiste Castel, Cailun A S Tanney, Virginia Natali Miguel, Melissa Bredow, Katharina Melkonian, Maria Camila Rodriguez Gallo, Jean Keller, Márcia Gonçalves-Dias, Karima El Mahboubi, Jiashu Chu, Thomas A DeFalco, Cyril Zipfel, R Glen Uhrig, Pierre-Marc Delaux, Jacqueline Monaghan
{"title":"Divergent Roles of CPK28 in Immune Homeostasis Across Land Plants.","authors":"Ruoqi Dou, Baptiste Castel, Cailun A S Tanney, Virginia Natali Miguel, Melissa Bredow, Katharina Melkonian, Maria Camila Rodriguez Gallo, Jean Keller, Márcia Gonçalves-Dias, Karima El Mahboubi, Jiashu Chu, Thomas A DeFalco, Cyril Zipfel, R Glen Uhrig, Pierre-Marc Delaux, Jacqueline Monaghan","doi":"10.1094/MPMI-02-26-0020-SC","DOIUrl":"10.1094/MPMI-02-26-0020-SC","url":null,"abstract":"<p><p>Calcium-dependent protein kinases decode cellular calcium transients and play diverse roles in plant growth and stress responses. In <i>Arabidopsis thaliana</i>, AtCPK28 contributes to immune homeostasis by phosphorylating subgroup IV plant U-box proteins, which target the key immune receptor-like cytoplasmic kinase AtBIK1 for turnover. Here, we present functional analysis of MpCPK28 in the liverwort <i>Marchantia polymorpha</i>. We identify the subgroup IV plant U-box protein MpPUB20e as a substrate of MpCPK28 and provide evidence that MpPBLa (the functional ortholog of AtBIK1) undergoes proteasomal degradation and can be ubiquitinated by MpPUB20e. Interestingly, although loss of <i>CPK28</i> function in multiple angiosperm species results in enhanced immune signaling, we found that Marchantia <i>Mpcpk28</i> mutant alleles do not display enhanced immune-triggered production of reactive oxygen species or resistance to two pathogens. However, transgenic expression of <i>MpCPK28</i> is able to restore function in Arabidopsis <i>cpk28-1</i> mutants, suggesting latent functional conservation of MpCPK28. Furthermore, although AtCPK28-mediated phosphorylation of Thr95/94 on AtPUB25/26 is known to contribute to their activation, we did not observe a functional role for the equivalent residue Thr122 on MpPUB20e. Taken together, our results suggest that post-translational fine-tuning by CPK28 is likely to have refined the \"PUB-BIK1\" module in the vascular plant lineages. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"573-579"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148352716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Leaf Rust in Rye: From Pathogen Biology to Host Defense and Resistance Breeding. 黑麦叶锈病:从病原生物学到寄主防御和抗性育种。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-07-01 Epub Date: 2026-08-25 DOI: 10.1094/MPMI-02-26-0014-IRW
Monika Rakoczy-Trojanowska, Mateusz Matuszkiewicz, Joanna Szewińska, Magdalena Święcicka, Anna Piasecka, Marta Dmochowska-Boguta, Mikołaj Małecki, Wojciech Wakuliński, Wacław Orczyk
{"title":"Leaf Rust in Rye: From Pathogen Biology to Host Defense and Resistance Breeding.","authors":"Monika Rakoczy-Trojanowska, Mateusz Matuszkiewicz, Joanna Szewińska, Magdalena Święcicka, Anna Piasecka, Marta Dmochowska-Boguta, Mikołaj Małecki, Wojciech Wakuliński, Wacław Orczyk","doi":"10.1094/MPMI-02-26-0014-IRW","DOIUrl":"10.1094/MPMI-02-26-0014-IRW","url":null,"abstract":"<p><p>Leaf rust (LR), caused by <i>Puccinia recondita</i> f. sp. <i>secalis</i> (<i>Prs</i>), is considered one of the most dangerous rye (<i>Secale cereale</i> L.) diseases, causing yield losses exceeding 35%. This review summarizes all currently available data about this disease: pathogen characteristics (including its life cycle, natural variation, and disease symptoms), resistance resources, and the background of the plant immune response at the genome, transcriptome, and metabolome levels. The research conducted so far has allowed for the identification of dozens of genes that play a significant role in the rye immune response to <i>Prs</i> infection. Among them, genes encoding NBS-LRR proteins (including <i>SECCE1Rv1G0014220</i>, the most likely <i>Pr3</i> candidate), glycosyltransferase, β-1,3-glucanase, 1-deoxy-D-xylulose 5-phosphate synthase, β-1,3-glucanase, UDP-glycosyltransferase, pathogenesis-related protein 1, ammonium transporter, and cytochrome P450 enzymes are candidates for seedling and all-stage resistance, whereas <i>ScLr_ABC25</i> currently represents the most promising candidate associated with adult-plant resistance. Among the metabolites differentially accumulated in response to <i>Prs</i>, those related to phenylpropanoids, diterpenoids, and thiamine branches seem to play the most important role in the immune response. Finally, we suggest how the knowledge acquired so far about the rye-<i>Prs</i> interaction can be used in modern breeding programs aimed at obtaining cultivars with enhanced resistance to LR, such as through the use of functional gene markers and/or metabolic biomarker-assisted selection and, in the more distant future, by developing and applying new genomic techniques for precise editing of resistance and susceptibility genes, engineering synthetic immune receptors and decoys, and pan-genomic exploration for identification of rare or lineage-specific resistance alleles. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"560-572"},"PeriodicalIF":3.9,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148405346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Haplotype-Resolved Genomes of Diverse Oat Crown Rust Isolates Reveal Global Dispersion of Long-Lived Clonal Haplotypes with Limited Recombination. 不同燕麦冠锈病分离株的单倍型解析基因组揭示了长寿命克隆单倍型在有限重组下的全球分布。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-05-01 Epub Date: 2026-03-20 DOI: 10.1094/MPMI-08-25-0111-R
Eva C Henningsen, Eric S Nazareno, Rebecca Spanner, David Lewis, Jibril Lubega, Erin P Moreau, Matthew J Moscou, Brendan Boesen, Eric Stone, Kostya Kanyuka, Shahryar F Kianian, Brian J Steffenson, Peter N Dodds, Jana Sperschneider, Melania Figueroa
{"title":"Haplotype-Resolved Genomes of Diverse Oat Crown Rust Isolates Reveal Global Dispersion of Long-Lived Clonal Haplotypes with Limited Recombination.","authors":"Eva C Henningsen, Eric S Nazareno, Rebecca Spanner, David Lewis, Jibril Lubega, Erin P Moreau, Matthew J Moscou, Brendan Boesen, Eric Stone, Kostya Kanyuka, Shahryar F Kianian, Brian J Steffenson, Peter N Dodds, Jana Sperschneider, Melania Figueroa","doi":"10.1094/MPMI-08-25-0111-R","DOIUrl":"10.1094/MPMI-08-25-0111-R","url":null,"abstract":"<p><p><i>Puccinia coronata</i> f. sp. <i>avenae</i> (<i>Pca</i>), a fungal pathogen causing crown rust of oat, demonstrates rapid virulence evolution and adaptation to newly released cultivars. To further capture the genetic variation of <i>Pca</i>, we generated nuclear haplotype-resolved genomes for 10 isolates from Europe, Africa, and the Middle East and compared these with existing references for U.S. and Australian isolates. Of the full collection of 52 haplotypes, 40 were unique. Importantly, the presence of a nearly identical haplotype in a U.K. isolate collected in 1984 and in U.S. isolates from 1990 and 2017 supports the existence of long-lived clonal haplotypes in the global population that have been exchanged between lineages. We identified infrequent recombination between haplotypes from geographically dispersed isolates, hinting toward a globally mobile population of <i>Pca</i> that is mostly composed of persistent clonal lineages with some influence from rare recombination events. One isolate contained an additional scaffold with telomeric and centromeric features, suggesting the presence of a supernumerary chromosome. Whereas the core pan-proteome is enriched for predicted secreted and effector proteins, sequence and expression variation are most prevalent in non-core orthogroups, which also displayed allele-specific expression. We anticipate that this expanded collection of haplotypes will facilitate the development of new surveillance technologies and identification of virulence loci. [Formula: see text] Copyright © 2026 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"387-402"},"PeriodicalIF":3.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146180956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Virulence Gene ToxB Is Both Amplified and Disrupted by Transposons in the Wheat Pathogen Pyrenophora tritici-repentis. 小麦致病菌小麦萎黄菌的毒力基因ToxB被转座子扩增和破坏。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-05-01 Epub Date: 2026-05-14 DOI: 10.1094/MPMI-01-26-0003-R
Ryan Gourlie, Megan C McDonald, Mohamed Hafez, Reem Aboukhaddour
{"title":"The Virulence Gene <i>ToxB</i> Is Both Amplified and Disrupted by Transposons in the Wheat Pathogen <i>Pyrenophora tritici-repentis</i>.","authors":"Ryan Gourlie, Megan C McDonald, Mohamed Hafez, Reem Aboukhaddour","doi":"10.1094/MPMI-01-26-0003-R","DOIUrl":"10.1094/MPMI-01-26-0003-R","url":null,"abstract":"<p><p>The mechanisms that drive virulence gene duplication in plant-pathogenic fungi remain poorly understood. In <i>Pyrenophora tritici-repentis</i> (<i>Ptr</i>), responsible for tan spot of wheat, <i>ToxB</i> is a multicopy virulence gene encoding a proteinaceous necrotrophic effector. <i>ToxB</i> exhibits a virulence dosage effect, in which higher copy numbers are associated with increased disease severity. In this work, we sought to resolve a 25-year-old question as to what drove the proliferation of <i>ToxB</i> within <i>Ptr.</i> To investigate this, 23 long-read assemblies were generated and analyzed from a collection of globally distributed isolates with various <i>ToxB</i> copy numbers, with a specific focus on the regions containing <i>ToxB.</i> Extensive comparative alignments identified a Helitron-like element, <i>ToxB-HLE</i>, that appears to be driving the duplication of <i>ToxB</i> in an accessory region of chromosome 4. This region is entirely absent in isolates lacking <i>ToxB</i> or its nonfunctional homolog <i>toxb</i>. In addition to gene amplification by transposons, multiple independent transposon insertion events were identified in several isolates that disrupted the <i>ToxB</i> open reading frame, creating inactive <i>toxb</i> haplotypes. This study provides strong evidence supporting the hypothesis that transposons play dual roles in the rapid evolution of fungal pathogenicity by both amplifying and disrupting a key virulence gene in a globally distributed plant pathogen. [Formula: see text]Copyright © 2026 His Majesty the King in Right of Canada, as represented by the Minister of Agriculture and Agri-Food Canada. This is an open access article distributed under the CC BY 4.0 International license.</p>","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":" ","pages":"474-488"},"PeriodicalIF":3.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147639456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Secretory Circuits of Symbiosis in Medicago truncatula. 凤仙花共生分泌回路的研究。
IF 3.9 3区 生物学
Molecular Plant-microbe Interactions Pub Date : 2026-05-01 DOI: 10.1094/MPMI-06-26-0051-CM
Ruby Tiwari, Jawahar Singh
{"title":"Secretory Circuits of Symbiosis in <i>Medicago truncatula</i>.","authors":"Ruby Tiwari, Jawahar Singh","doi":"10.1094/MPMI-06-26-0051-CM","DOIUrl":"https://doi.org/10.1094/MPMI-06-26-0051-CM","url":null,"abstract":"","PeriodicalId":19009,"journal":{"name":"Molecular Plant-microbe Interactions","volume":"39 3","pages":"325-326"},"PeriodicalIF":3.9,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148361169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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