Pseudomonas syringae, bactérie épiphyte, glaçogène et pathogène

Gaignard, JL; Luisetti, Jacques

doi:10.1051/agro:19930501

Cited by 6 publications

(5 citation statements)

References 15 publications

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“…Hence, the small group of aforementioned bacteria can clearly disrupt the applecart of orderly adaptation to sub zero temperatures. Their presence on the surface of leaves, buds and fruits of vegetable, grain and fruit crops; wine grapes; olives; tea; forest, hedge and ornamental trees, and ornamental herbaceous plants can enhance the degree of frost damage sustained by these plants by causing water on or in these plants to freeze where it might have otherwise simply supercooled [54,78].…”

Section: Practical Applications Of Bacterial Ice Nucleation: Agricultmentioning

confidence: 99%

Ice nucleation active bacteria and their potential role in precipitation

Morris¹,

2004

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Certain bacteria that are commonly found on plants have the capacity to catalyze the freezing of supercooled water at temperatures as warm as −1 • C. This is conferred by a protein in the outer membrane of the bacterial cell. Because of the abundance of these bacteria and the warm temperature at which they function as ice nuclei, they are considered to be among the most active of the naturally-occurring ice nuclei. As plant pathogens, antagonists of plant pathogens and as causal agents of frost damage, these bacteria have wellstudied interactions with plants. Here we propose that these bacteria also play a role in atmospheric processes leading to rain, given that they are readily disseminated into the atmosphere and have been found in clouds at altitudes of several kilometers. That they participate in a sort of biological cycle of precipitation-whereby they are transported into clouds from plant canopies and incite rain thereby causing favorable conditions for their growth on plant surfaces-was proposed about 20 years ago. Today, sufficient evidence and meteorological tools have emerged to re-ignite interest in bioprecipitation and in the ways in which plants play a role as cloud seeders. 88 JOURNAL DE PHYSIQUE IV 2. THE BIOLOGICAL COMPONENT OF AEROSOLS Outside of urban zones, the air over continents contains 3 × 10 9 to 5 × 10 10 particles/m 3. Mineral dusts are abundant in atmospheric aerosols. In polluted regions a major component of these aerosols can be soot. But, anyone afflicted with allergies to pollen knows that there is a biological component to atmospheric aerosols. In fact, up to 25 % of the insoluble part of aerosols can be of biological origin [1]. Pollen is only one of the biological components of aerosols and is only one of the types of particles that plants contribute to the atmosphere. The seemingly abiotic atmosphere that surrounds our planet is a bouillon of biological bits including bacteria; protozoa; spores of fungi, ferns and mosses; virus particles; parts of insects and dust mites; algae and pollen grains. In some cases, these biotic particles are dead debris that are picked up into the air. But often, aerial dissemination is an integral part of the life cycle of organisms, a sort of boulevard to opportunities for species out-crossing and to supplemental food and water resources. At altitudes below about 15 m, there are hundreds to thousands of particles of biological origin per m 3 of air. Over a suburban region the quantity of microorganisms, for example, in the air has been observed to be as high as 7000 culturable propagules of fungi and 1600 cultural bacteria/m 3 [2]. The bulk of the popular interest in aerobiology concerns the presence-in the air we breath-of biological particles with direct negative impacts on human health such as allergens, causal agents of pneumonia and other lung diseases and of septicemias in hospital environments. The Andersen sampler, widely used in studies of aerobiology, was conceived to simulate uptake of particles by the human respiratory system [3]. This...

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Section: Practical Applications Of Bacterial Ice Nucleation: Agricultmentioning

confidence: 99%

Ice nucleation active bacteria and their potential role in precipitation

Morris¹,

2004

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“…This bacterium is an opportunistic human pathogen responsible for frequently lethal hospital infections . Secondly, plant deleterious pseudomonads, like P. syringae , produce toxins that affect the plant growth and their primarily foliar pathogen producing diverse types of disease symptoms . Finally, P. fluorescens and P. putida considered among saprophytic bacteria can exert a toxic activity against various deleterious microorganisms .…”

Section: Introductionmentioning

confidence: 99%

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

Mehri

Turki

Chérif

et al. 2013

CLEAN Soil Air Water

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Biological treatment methods use natural processes of ubiquitous living organisms to improve or upgrade the quality of a wastewater. To investigate the dominance of Pseudomonas spp. community in untreated and treated wastewater from full-scale biodiscs treatment plant, PCR-denaturing gradient gel electrophoresis coupled with sequence analysis of 16S rRNA gene fragments from dominant bands, were performed. The Pseudomonas species distribution over the total treatment process and over seasons (summer and winter) was obtained by comparing the denaturing gradient gel electrophoresis (DGGE) patterns to a normalized mix of nine reference Pseudomonas strains. Results indicated that Pseudomonas putida and Pseudomonas fluorescens strains showed dominance in wastewater, remarkable stability in the biofilm and resistance to UV irradiation. A reduction of Pseudomonas aeruginosa in treated wastewater was also observed. In addition, climatic and operational conditions results in selection of microbial community. The high temperature and intense solar radiation contribute to the total absence of the Pseudomonas syringae strain. In this work, the effect of increasing UV 254 germicidal dose on the Pseudomonas community in secondary treated wastewater effluent was also tested. At a dose of 1200 mWs/cm 2 , total disappearance of the band corresponding to P. aeruginosa, was noted. The DGGE approach can be used as an effective method to assess directly the Pseudomonas community shifts in studied wastewater treatment plant.

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“…Pseudomonas syringae is a common environmental bacterium that is ubiquitous in both aquatic and agricultural habitats where it can have both saprophytic and pathogenic behaviour. Pseudomonas syringae is also an important plant pathogen causing diseases such as kiwifruit canker reported in all kiwi-producing regions: Australasia, Europe and South America (Hirano and Upper 1990;Gaignard and Luisetti 1993;Vanneste 2013;Donati et al 2014). Since the beginning of the 20th century, 55 cases of bacterial diseases in 25 countries and on 25 species of trees of agronomic importance were declared as being caused by this bacterium (Lamichhane et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A set of PCRs for rapid identification and characterization ofPseudomonas syringaephylogroups

Borschinger

Bartoli

Chandeysson³

et al. 2016

J Appl Microbiol

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To date, phylogenetic affiliation within the Ps. syringae complex was only possible by sequencing housekeeping genes. Here, we propose a rapid PCR-based method for the detection of specific phylogroups of the Ps. syringae complex. Furthermore, for the first time we reveal the presence of Ps. syringae strains belonging to phylogroups 10 and 13 as epiphytes on plants, whereas they had previously only been observed in aquatic habitats.

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Pseudomonas syringae, bactérie épiphyte, glaçogène et pathogène

Cited by 6 publications

References 15 publications

Ice nucleation active bacteria and their potential role in precipitation

Ice nucleation active bacteria and their potential role in precipitation

Influence of Biological Treatment and Ultraviolet Disinfection System on Pseudomonas spp. Diversity in Wastewater as Assessed by Denaturing Gradient Gel Electrophoresis

A set of PCRs for rapid identification and characterization ofPseudomonas syringaephylogroups

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