Overwintering Squash Bugs Harbor and Transmit the Causal Agent of Cucurbit Yellow Vine Disease

Pair, S. D.; Bruton, B. D.; Mitchell, Forrest L.; Fletcher, Jacqueline; Wayadande, Astri; Melcher, Ulrich

doi:10.1603/0022-0493-97.1.74

Cited by 13 publications

(3 citation statements)

References 23 publications

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“…This short latent period coupled with an irregular transmission pattern are indicative of a noncirculative mode of transmission (Purcell & Finlay, 1979; Bextine, 2001). Despite its noncirculative association, S. marcescens overwinters in the dormant insect vector – a strategy that protects the pathogen against low winter temperatures – ensuring a high survival rate and thus successful transmission to plants in the following season (Pair et al ., 2004).…”

Section: Insects As Vectors For Phytopathogenic Bacteriamentioning

confidence: 99%

Insects as alternative hosts for phytopathogenic bacteria

2011

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Phytopathogens have evolved specialized pathogenicity determinants that enable them to colonize their specific plant hosts and cause disease, but their intimate associations with plants also predispose them to frequent encounters with herbivorous insects, providing these phytopathogens with ample opportunity to colonize and eventually evolve alternative associations with insects. Decades of research have revealed that these associations have resulted in the formation of bacterial-vector relationships, in which the insect mediates dissemination of the plant pathogen. Emerging research, however, has highlighted the ability of plant pathogenic bacteria to use insects as alternative hosts, exploiting them as they would their primary plant host. The identification of specific bacterial genetic determinants that mediate the interaction between bacterium and insect suggests that these interactions are not incidental, but have likely arisen following the repeated association of microorganisms with particular insects over evolutionary time. This review will address the biology and ecology of phytopathogenic bacteria that interact with insects, including the traditional role of insects as vectors, as well as the newly emerging paradigm of insects serving as alternative primary hosts. Also discussed is one case where an insect serves as both host and vector, which may represent a transitionary stage in the evolution of insect-phytopathogen associations.

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Section: Insects As Vectors For Phytopathogenic Bacteriamentioning

confidence: 99%

Insects as alternative hosts for phytopathogenic bacteria

2011

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“…Serratia marcescens is a Gram-negative bacterium that has a significant health and economic impact as an agent of hospital infections and as a plant pathogen [12, 25]. S. marcescens infects a broad range of hosts from insects to coral [8, 26].…”

Section: Introductionmentioning

confidence: 99%

Catabolite repression control of flagellum production by Serratia marcescens

Stella

Kalivoda

O’Dee

et al. 2008

Research in Microbiology

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Serratia marcescens is an emerging opportunistic pathogen with a remarkably broad host range. The cAMP-regulated catabolite repression system of S. marcescens has recently been identified and demonstrated to regulate biofilm formation through the production of surface adhesions. Here we report that mutations in components of the catabolite repression system (cyaA and crp) eliminate flagellum production and swimming motility. Exogenous cAMP was able to restore flagellum production to adenylate cyclase mutants, as determined by transmission electron microscopy and PAGE analysis. A transposon-generated suppressor mutation of the crp motility defect mapped to upstream of the flhDC operon. This suppressor mutation resulted in an upregulation of flhD expression and flagellum production, indicating that flhDC expression is sufficient to restore flagellum production to crp mutants. Lastly, and contrary to a previous report, we found that flhD expression is controlled by the catabolite repression system using quantitative RT-PCR. Together, these data indicate that flagellum production is regulated by the cAMP-dependent catabolite repression system. Given the role of flagella in bacterial pathogenicity, the regulatory pathway described here may assist us in better understanding the putative role of motility in dissemination and virulence of this opportunistic pathogen.

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“…These generalist feeding habits and large‐scale damage to plant organs distinguish A. tristis from most phloem‐localized pathogen vectors and, indeed, A. tristis was not known to vector plant pathogens before CCS was identified (Bruton et al ., ). It is unclear where in the vector CCS is maintained, and research has shown CCS can overwinter in dormant A. tristis (Pair et al ., ; Purcell and Finlay, ; Wayadande et al ., ). Other S. marcescens strains are also plant pathogens, but are not insect vectored or phloem limited (Gillis et al ., ; Ovcharenko et al ., ; Wang et al ., ).…”

Section: Walled Phloem‐limited Bacteriamentioning

confidence: 99%

The enemy within: phloem‐limited pathogens

Bendix

Lewis

2017

Molecular Plant Pathology

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SUMMARYThe growing impact of phloem-limited pathogens on high-value crops has led to a renewed interest in understanding how they cause disease. Although these pathogens cause substantial crop losses, many are poorly characterized. In this review, we present examples of phloem-limited pathogens that include intracellular bacteria with and without cell walls, and viruses. Phloem-limited pathogens have small genomes and lack many genes required for core metabolic processes, which is, in part, an adaptation to the unique phloem environment. For each pathogen class, we present multiple case studies to highlight aspects of disease caused by phloem-limited pathogens. The pathogens presented include Candidatus Liberibacter asiaticus (citrus greening), Arsenophonus bacteria, Serratia marcescens (cucurbit yellow vine disease), Candidatus Phytoplasma asteris (Aster Yellows Witches' Broom), Spiroplasma kunkelii, Potato leafroll virus and Citrus tristeza virus. We focus on commonalities in the virulence strategies of these pathogens, and aim to stimulate new discussions in the hope that widely applicable disease management strategies can be found.

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Overwintering Squash Bugs Harbor and Transmit the Causal Agent of Cucurbit Yellow Vine Disease

Cited by 13 publications

References 23 publications

Insects as alternative hosts for phytopathogenic bacteria

Insects as alternative hosts for phytopathogenic bacteria

Catabolite repression control of flagellum production by Serratia marcescens

The enemy within: phloem‐limited pathogens

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