Bacterial Wilt Disease: Molecular and Ecological Aspects

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A zonula occludens toxin that increases cell permeability, leading to the disassembly of intercellular tight junctions, was found in every brown rot strain from phylotype IB A total of three out of eight genes of the rhi -type antimitotic toxin operon were found in every emerging strain from phylotype IIB-4NPB.

Exploration of the diversity within almost clonal strains of R. Hence, we analyzed the relationships of the 72 R. It is important here to point out one of the particular features of this second analysis. This phylotype was recently estimated to be partly clonal, which may induce a bias into the population structure inference. The effect of complete population clonality would be that the inferred clustering of individuals would reflect subdivisions of the diversity, as a tree would do, rather than actual populations 12 , It remains difficult to estimate the degree of disruption caused in our inference, and one must be cautious when interpreting those particular results.

In the population structure analysis, phylotype IV appeared to be associated with phylotypes I and III, while phylotype II was divided into two groups.

  • Bacterial Wilt Disease - Molecular and Ecological Aspects | Philippe Prior | Springer.
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This result was quite surprising in that a separation between phylotypes I and III, on the one hand, and phylotype IV, on the other hand, was expected. Topologies were also congruent regardless of the data set targeted by the probes used: S2 in the supplemental material , the megaplasmid see Fig. S3 , and type III effectors see Fig. S4 or, more generally, genes recognized to be involved into pathogenicity see Fig. This is consistent with the hypothesis of a long coevolution of the two replicons 6 , 15 , 19 and the ancestral character of R. Finally, the results confirmed the main repartition of core genes on the chromosome 19 , 30 , 31 , but no major gene repertories explained the known phylogeny of R.

This suggests, rather than a gene content difference, a fine-tuning of gene expression and regulation; nonetheless, many genes were associated with unknown and uncharacterized proteins. The pangenomic microarray approach developed in this study was successful in distinguishing between phylogenetic positions relative to brown rot strains from phylotype IIB-1, Moko disease-causing strains from phylotype IIB-4, and emerging strains from phylotype IIB-4NPB. The investigation first focused on cold-tolerant phylotype IIB-1 strains, which represent a serious threat for potato production in Europe and temperate regions of the world.

These strains were formerly known to present a clonal structure 20 , 23 , 27 , 38 , and considerable diversity associated with the geographical distribution of strains was inferred in this study. Analysis showed two major clusters, but surprisingly, whereas the inference of phylogeny reflected a separation between sequevar 1 and 2 strains phylotype II , the Bayesian population structure assessment method grouped strains from the Andean region together.

Since the potato S. A focus on the major cluster composed only of phylotype IIB-1 strains revealed at least four subclusters correlated with the geographical origins of strains and named after these locations. The group names must nevertheless be taken with caution, since the location of isolation may not represent the real center of origin. The hybrid profile revealed by the estimated membership probability values among strains from clusters B and C and among strains within each cluster suggests high gene flows between those two populations. To our knowledge, assignment of strain PSS, isolated in Taiwan from potato, to the European cluster B supports the hypothesis of its introduction into Taiwan through Pelargonium material P.

Prior, unpublished data; J. Such data provide epidemiological evidence of the introduction and spread of strains across countries, supposedly carried by infected material. M Instructional Designs questions store: Lefeuvre , a and P. Although the pathogen causes major yield lost in the tropics and subtropics, it is currently a continuing threat in temperate climates. This means that it is present in parts of Europe, but is under statutory control. Worldwide, the most important crops affected are: potato, tomato, tobacco, banana, and geranium. In the UK and the rest of the EU, the most important crops affected are potato and tomato.

It would cause serious economic damage were it to become more established than it currently is. Losses are due to actual yield reduction and also due to statutary measures taken to eliminate the disease. Bacterial wilt caused by R.

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The disease is known as southern wilt, bacterial wilt, and brown rot of potato. Many more dicots suffer from the disease than do monocots. Among the monocot hosts, the order Zingiberales dominates with five of nine families being infected by this bacterium. Originally, R. However, this pathogen has recently been detected in geraniums Pelargonium spp. Brown rot of potato caused by R.

Bacterial Wilt Disease

From Wikipedia, the free encyclopedia. Ralstonia solanacearum Symptoms caused by Ralstonia solanacearum on tomato Scientific classification Domain: Bacteria. Smith Yabuuchi et al. Plant-associated bacteria. Dordrecht, Springer. Plant pathology. Amsterdam [u. Standards in Genomic Sciences.

Biological Control. Retrieved FEMS Microbiol. Molecular Plant-Microbe Interactions. Proceedings of the National Academy of Sciences. BMC Genomics.

Bacterial Wilt Disease: Molecular and Ecological Aspects - Google книги

Current Opinion in Microbiology. Annual Review of Phytopathology. Applied and Environmental Microbiology. Archived from the original PDF on Plant Health Progress. University of Wisconsin Pest Alert - Ralstonia wilt. The current bacterial wilt situation: a global overview. Signs: Bacterial ooze or streaming may occur. Symptoms: On potatoes and other solanaceous hosts: the first visible symptoms are wilting of the youngest leaves during the hottest part of the day, often on just one side of a leaflet or on a single branch.

Another common symptom associated with bacterial wilt in the field is plant stunting.

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The entire plant may wilt quickly, leading to general wilting and yellowing of foliage and eventually plant death. A longitudinal slice of infected stems or stolons will reveal vascular browning, visible as long, narrow, dark brown streaks. In succulent young plants of highly susceptible varieties, the stem can collapse, and gray-white bacterial ooze may be visible on stem surfaces.

In geranium: symptoms of Southern wilt can be subtle and easily overlooked. Symptoms usually begin with chlorosis and wilting of the lower leaves, then progress to an upward curling of leaf margins that is very characteristic. Under favorable conditions, the disease develops rapidly on geraniums and wilting may move upwards from older to younger leaves. Wilted leaves often develop wedge-shaped areas of chlorosis that become necrotic. The leaf margins may also become chlorotic, then necrotic, and the whole plant may desiccate and die.

In late stages of disease, stems may collapse. Vascular discoloration is visible in stems especially at the root crown and roots; these can blacken and eventually become necrotic. In the early stages of disease in potato and geranium, the infected plants may appear to recover at night. Culture: To identify to genus and species. TZC selective medium - o C for hours. Molecular: Weller et al. Another multiplex reaction that incorporates a third primer set, with an internal control, was developed for detection of R. Conventional PCR detection of R.

For race and biovar testing: Once Ralstonia solanacearum has been confirmed, samples or cultures are sent to CPHST- Beltsville laboratory for race and biovar confirmation. Biovar Plate Assay: A plate assay that differentiates biovar based on pure culture utilization of carbohydrates and sugar alcohol utilization is available. Mistaken Identities: Other races and biovars within R.

Materials and methods

Bacterial blight can also produce leaf spots in addition to the wilting symptom.