Plant Pathogenic Bacteria Studies

Conserved effectors underpin the virulence of liverwort-isolated Pseudomonas in divergent plants

The paper identifies conserved virulence factors in Pseudomonas viridiflava that enable infection of both liverworts and flowering plants.

A novel allele of Mitogen Activated Protein Kinase 6 is linked to disease resistance and constitutive immunity in rice.

The paper identifies a novel OsMAPK6 allele in rice linked to disease resistance and constitutive immunity against bacterial blight.

Xanthomonas citri pv. lagerstroemium, description of a new pathovar causing leaf spot on crape myrtle

The paper describes a new pathovar of Xanthomonas citri causing leaf spot on crape myrtle, using genomic data and Koch's postulates to establish its status.

A PthXo2B ortholog in Xanthomonas oryzae pv oryzae strain IX-221 acts as a major virulence factor on indica rice without activating a Clade III SWEET gene.

This paper identifies a TALE variant in Xoo strain IX-221 that overcomes xa13 resistance in indica rice by upregulating an alternative SWEET gene, highlighting non-RVD sequence variation in TALE targeting.

Assembly and annotation of Solanum dulcamara and Solanum nigrum plant genomes, two nightshades with different susceptibilities to Ralstonia solanacearum

The paper assembles and annotates the genomes of two nightshade plants, S. dulcamara and S. nigrum, to identify genetic differences associated with resistance and susceptibility to Ralstonia solanacearum.

Established Pseudomonas syringae pv. tomato infection disrupts immigration of leaf surface bacteria to the apoplast

This study shows that Pseudomonas syringae pv. tomato infection prevents Salmonella enterica from entering the apoplast, unlike Xanthomonas hortorum pv. gardneri infection, and reveals broader effects on phyllosphere bacteria.

Non-invasive, bioluminescence-based visualization and quantification of bacterial infections in Arabidopsis over time

The paper develops a non-invasive imaging system and analysis pipeline to track bacterial infection progression in Arabidopsis over time using bioluminescence.

Genomic biosurveillance of the kiwifruit pathogen Pseudomonas syringae pv. actinidiae biovar 3 reveals adaptation to selective pressures in New Zealand orchards

The paper sequenced Psa3 isolates from New Zealand kiwifruit orchards to study adaptation to selective pressures, identifying a hopF1c loss variant linked to copper resistance and assessing its pathogenicity and spread.

Diverse Pseudomonas species engage in beneficial and suppressive interactions with the kiwifruit pathogen Psa across Actinidia germplasm

The paper investigates interactions between Pseudomonas species and the kiwifruit pathogen Psa in Actinidia germplasm, finding that some Pseudomonas isolates can enhance Psa growth in resistant hosts.

A bacterial type III effector hijacks plant ubiquitin proteases to evade degradation

This study identifies how the bacterial effector RipE1 stabilizes by hijacking plant ubiquitin proteases and phosphorylation, avoiding degradation and promoting bacterial survival.

Negative frequency-dependent selection contributes to modular structure of effector repertoires in Pseudomonas syringae

The paper uses a computational model to show that negative frequency-dependent selection contributes to the modular structure of effector repertoires in Pseudomonas syringae.

Activation of three targets by a TAL effector confers susceptibility to bacterial blight of cotton

The paper identifies a newly evolved TALE, Tal7b, that activates multiple GhSWEET genes in cotton, contributing to bacterial blight susceptibility.

The TALE effector PthA4 of Xanthomonas citri subsp. citri indirectly activates an expansin gene CsEXP2 and an endoglucanase CsEG1 via CsLOB1 to cause citrus canker symptoms

The paper identifies CsEXP2 and CsEG1 as downstream targets of CsLOB1, activated indirectly by Xcc's PthA4, leading to citrus canker symptoms.

Distinct Virulence Mechanisms of Burkholderia gladioli in Onion Foliar and Bulb Scale Tissues

This study identifies distinct virulence mechanisms of Burkholderia gladioli in onion foliar and bulb scale tissues, showing different factors contribute to tissue-specific symptoms.

Exploiting Pseudomonas syringae Type 3 secretion to study effector contribution to disease in spinach

This study uses a modified Pseudomonas syringae strain to identify key effectors contributing to disease in spinach, enabling high-throughput analysis of effector function.

Two TAL effectors of Xanthomonas citri pv. malvacearum target GhSWEET15 as the susceptibility genes for bacterial blight of cotton

This study identifies Tal1b and Tal1 as TAL effectors targeting GhSWEET15 genes, contributing to bacterial blight susceptibility in cotton.

Plasmids encode and can mobilize onion pathogenicity in Pantoea agglomerans

This study identifies plasmids encoding pathogenicity factors in Pantoea agglomerans, showing they can transform non-pathogenic strains into onion pathogens.

Xanthomonas oryzae pv. oryzae type-III effector TAL9b targets a broadly conserved disease susceptibility locus to promote pathogenesis in rice

This study identifies TAL9b as a Xoo effector targeting OsS5H/FNS-03g, a bifunctional protein whose product apigenin promotes bacterial blight in rice.

A Necrotizing Toxin Promotes Pseudomonas syringae Infection Across Evolutionarily Divergent Plant Lineages

This study identifies syringomycin as a key necrotizing toxin that enables Pseudomonas syringae to infect diverse plant lineages, including non-flowering species.

Development and Validation of Genome-Informed and Multigene-based qPCR and LAMP Assays for Accurate Detection of Dickeya solani: A Critical Quarantine Pathogen Threatening Potato Industry

The paper develops and validates qPCR and LAMP assays for specific detection of Dickeya solani, achieving high accuracy and sensitivity for phytosanitary and epidemiological applications.

Evaluation of sequence-based tools to gather more insight into the positioning of rhizogenic agrobacteria within the Agrobacterium tumefaciens species complex

The paper evaluates phylogenetic methods to improve Agrobacterium taxonomy, finding that multi-locus sequence analysis with ANIb thresholds better defines genomospecies than single-gene approaches.

Unraveling the in planta growth of the plant pathogen Ralstonia pseudosolanacearum by mathematical modeling

This study uses mathematical modeling and in vitro experiments to show that xylem sap supports high bacterial densities of R. pseudosolanacearum by utilizing glutamine and excreting putrescine.

Identification and characterization of innate immunity in Actinidia melanandra in response to Pseudomonas syringae pv. actinidiae

This study identifies and characterizes innate immunity in Actinidia melanandra against Pseudomonas syringae pv. actinidiae, revealing PTI triggered by the T3S system.

Four cell wall-degrading enzymes of Xanthomonas campestris pv. campestris determine bacterial escape from hydathodes to the leaf vasculature

This study identifies four cell wall-degrading enzymes (CWDEs) secreted via the T2SS that enable Xcc to breach hydathodes and access the leaf vasculature, facilitating long-distance plant colonization.

Lectins and polysaccharide EPS I have flow-responsive roles in the attachment and biofilm mechanics of plant pathogenic Ralstonia

This study shows that Ralstonia pseudosolanacearum lectins and EPS I have dual roles in biofilm attachment and mechanics depending on environmental flow conditions.

Genotypic and Phenotypic Analyses Show Ralstonia solanacearum Cool Virulence is a Quantitative Trait Not Restricted to 'Race 3 biovar 2'

The paper analyzes genotypic and phenotypic data to show that cool virulence in Ralstonia solanacearum is a quantitative trait not exclusive to R3bv2 strains.

Comparative transcriptomics reveal a highly polymorphic Xanthomonas HrpG virulence regulon

This study uses transcriptomics to compare the HrpG regulon across 17 Xanthomonas strains, revealing diverse gene regulation beyond the T3SS and T3Es.

Niche-Based Priority Effects Predict Microbe Resistance to Erwinia amylovora in Pear Nectar

The paper assesses how microbial biological control agents (mBCAs) affect Erwinia amylovora resistance in pear nectar through priority effects, finding that nectar pH and sucrose changes are key predictors.

Complementary roles of EPS, T3SS, and Expansin for virulence of Erwinia tracheiphila, the causative agent of cucurbit wilt

This study investigates the roles of EPS, Hrp T3SS, and Expansin in the virulence of E. tracheiphila, showing EPS is essential for survival, while Hrp T3SS and Expansin are needed for systemic wilt symptoms.

Signal Antagonists Suppress Pseudomonas syringae Pathogenicity

This study designs and synthesizes leudiazen analogs that inhibit Pseudomonas syringae virulence without killing the bacteria, reducing resistance risk.