Effets de la dessiccation sur les bacteries gram-negatives d'un sol

Kilbertus, G.; Proth, J.; Vervier, B.

doi:10.1016/0038-0717(79)90085-3

Cited by 25 publications

(9 citation statements)

References 15 publications

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“…The water‐binding capacity of polysaccharides is well understood and is usefully reviewed online by Chaplin (2007). The role of exopolysaccharide as a bacterial ‘water reservoir’ in dry terrestrial environments has been studied over several decades (Kilbertus et al , 1979; Hartel & Alexander, 1986). Bacterial exopolysaccharide may act as a buffer against changes in the water content of the environment, slowing down the rate of water loss or uptake by cells (Dudman, 1977).…”

Section: Resultsmentioning

confidence: 99%

Role of outer membrane lipopolysaccharides in the protection of Salmonella enterica serovar Typhimurium from desiccation damage

Garmiri

Coles

Humphrey

et al. 2008

FEMS Microbiology Letters

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The ability to survive desiccation between hosts is often essential to the success of pathogenic bacteria. The bacterial outer membrane is both the cellular interface with hostile environments and the focus of much of the drying-induced damage. This study examined the contribution of outer membrane-associated polysaccharides to the survival of Salmonella enterica serovar Typhimurium in air-dried blood droplets following growth in high and low osmolarity medium and under conditions known to induce expression of these polysaccharides. Strains lacking the O polysaccharide (OPS) element of the outer membrane lipopolysaccharide were more sensitive to desiccation. Lipopolysaccharide core mutation further to OPS loss did not result in increased susceptibility to drying. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis revealed lipopolysaccharide profiles that supported the hypothesis that OPS expression is required for optimal drying resistance in S. Typhimurium. The role of O antigen in Salmonella spp. in maintaining a hydrated layer around the dried cell or in slowing the rate of dehydration and rehydration is discussed.

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Section: Resultsmentioning

confidence: 99%

Role of outer membrane lipopolysaccharides in the protection of Salmonella enterica serovar Typhimurium from desiccation damage

Garmiri

Coles

Humphrey

et al. 2008

FEMS Microbiology Letters

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“…The high soil bacterial diversity in wet conditions is thought to be related to changes in the soil bacterial community structures, e.g. ; decrease in the relative abundance of gram negative bacteria (Kilbertus and Proth, 1979).…”

Section: Discussionmentioning

confidence: 99%

Soil environmental factors relating to diversity of culturable soil bacterial communities in the Sakaerat Environmental Research Station, Thailand

Doi

Sakurai

2003

Tropics

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Soil biodiversity may relate to environmental changes in the soil. To determine how soil environmental factors relate to soil bacterial diversity, we compared culturable bacterial communities in soils under bare ground (BG, highly degraded), dry dipterocarp forest (DDF, moderately disturbed) and dry evergreen forest (DEF, the original vegetation) that form a degradation gradient in the Sakaerat Environmental Research Station (SERS), Thailand. The Shannon diversity and evenness and Simpson indexes were determined using the sole carbon source most probable number method. Variation patterns of these indexes were analyzed for three data sets obtained during the dry (February) to wet aune) seasonal transition. Only the March data set had significant differences in the diversity indexes among the vegetative types. In March, BG soil had a significantly lower Shannon diversity index (1.77) and evenness index (0.64) than the others (2.34 and 0.84 for DDF and 2.41 and 0.87 for DEF), and a higher Simpson index of 0.23 (0.08 for DDF and 0.07 for DEF). Repeated measures analysis of variance at p=0.05 indicated that both vegetative type and sampling time were significant sources of variation of the Shannon indexes, while only sampling time was a significant source of variation of the Simpson index. Simple and multiple regression analyses and a redundancy analysis ordination diagram showed that throughout the period of the study, soil water content was the most significant soil environmental factor with regard to the Shannon and Simpson diversity indexes. The soil bacterial communities under all the vegetative types had higher diversity and evenness in the wet months. The transition from dry to wet season had a grater effect on variation of the diversity indexes than did the soil degradation gradient.

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“…Fine organic particles or amorphous SOM may be located in pores too small to be entered by microbes, or held within the sub-units of clay particles; microorganisms or very ®ne plant fragments may be coated by clay particles (Kilbertus et al, 1979;Kilbertus, 1980;Foster, 1981;. It is also apparent in such observations that microorganisms and organic components are physically separated by the arrangement of soil minerals.…”

Section: Information Obtained From Soil Microscopic Observationsmentioning

confidence: 95%

Relationship of soil organic matter dynamics to physical protection and tillage

Balesdent

Chenu

Balabane

2000

Soil and Tillage Research

1,049

559

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Tillage has been reported to reduce organic matter concentrations and increase organic matter turnover rates to a variable extent. The change of soil climate and the incorporation of aboveground C inputs within the soil lead to no unique effect on biodegradation rates, because of their strong interaction with the regional climate and the soil physical properties. The periodical perturbation of soil structure by tools and the subsequent drying±rewetting cycles may be the major factor increasing organic matter decomposition rates by exposing the organic matter that is physically protected in microaggregates to biodegradation. This paper reviews the assessed effects of tillage on organic matter, the scale, extent and mechanisms of physical protection of organic matter in soils. #

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Effets de la dessiccation sur les bacteries gram-negatives d'un sol

Cited by 25 publications

References 15 publications

Role of outer membrane lipopolysaccharides in the protection of Salmonella enterica serovar Typhimurium from desiccation damage

Role of outer membrane lipopolysaccharides in the protection of Salmonella enterica serovar Typhimurium from desiccation damage

Soil environmental factors relating to diversity of culturable soil bacterial communities in the Sakaerat Environmental Research Station, Thailand

Relationship of soil organic matter dynamics to physical protection and tillage

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