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A study of kiwi disease found that closely related bacterial strains behave differently

Elodie Vandelle, Annalisa Polverari, Davide Danzi, Vanessa Maurizio, Alice Regaiolo, Maria Rita Puttilli, Teresa Colombo, Tommaso Libardi Credits: Elodie Vandelle

Over the last decade, severe outbreaks of bacterial ulcers have caused enormous economic losses to kiwi producers, especially in one of the largest producers, Italy, New Zealand and China.Bacterial ulcers are caused by bacterial pathogens Pseudomonas syringe pv. Actinidia polygama (Psa) and recent outbreaks are particularly devastating with the emergence of a new, highly aggressive biovar called Psa3.


Due to its recent introduction, the pathogenic molecular basis of Psa3 is unknown and difficult to develop. Mitigation strategy.. In light of this dilemma, a group of scientists at the University of Verona and the University of Rome collaborated on a study comparing the behavior of Psa3 with less toxic biovars to determine the basis of pathogenicity.

They especially include genes involved in bacterial signal transduction (transmission of intracellular external stimuli), especially those required for the synthesis and degradation of small chemical signals called c-di-GMP that suppress the expression of pathogenic factors. I found it important. Compared to other biotypes, Psa3 produces very low levels of c-di-GMP, contributing to an immediate and aggressive phenotype at the onset of infection before the plant encloses the defensive response. ..

“It was exciting to discover this diverse arsenal of pathogenicity strategies among closely related bacterial strains that infect the same host but behave differently,” said the scientists involved in the study. One, Elodie Vandelle, said. “Their” small “genomes contain primarily the same information, but our study shows that the bacterial population within the pathogen is more complex than expected, and different strategies for attacking the same host. Pathogenicity may have evolved through. “

Their research emphasizes the importance of addressing a large number of real pathogenic bacterial strains in order to shed light on the diversity of pathogenic strategies.This approach can contribute to broader creativity Pathogenic Working model. Regarding the production of kiwi, Van der hopes that their findings will help scientists develop new mitigation methods.In the long run, their research may lead to the identification of key molecular switches involved in the transition between high and low bacteria. toxicity Phenotype.

“This identification allows us to develop new targeting strategies to control phytopathogenic bacteria at the industrial level, which diminishes aggression by switch control rather than killing phytopathogenic bacteria,” Vandel said. explained. “This avoids the development of new resistance between bacterial communities and ensures sustainable plant protection.”


Unpacking two layers of bacterial gene regulation during plant infection


For more information:
Transcription profiling of Elodie Vandelle et al, ThreePseudomonas syringaepv.actinidiae Biovars reveals different responses to apoplast-like conditions associated with host strain toxicity. Interaction between molecular plants and microorganisms (2020). DOI: 10.1094 / MPMI-09-20-0248-R

Courtesy of the American Society of Plant Pathology

Quote: A study of kiwi disease found that closely related bacterial strains behave differently (June 25, 2021).

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A study of kiwi disease found that closely related bacterial strains behave differently

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