Nitrate reduction in the leaves and numbers of nitrifiers in the rhizosphere ofPlantago lanceolata growing in two contrasting sites

Blacquière, T.

doi:10.1007/bf02198127

Cited by 19 publications

(2 citation statements)

References 14 publications

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“…This is rather unexpected when it is assumed that the community of nitrite-oxidizing bacteria is dependent on the community of ammonium-oxidizing bacteria for their substrate. A discrepancy between numbers of ammonium oxidizers and nitrite oxidizers was previously ob-109 served [6,11,16,35] and might be explained by enhanced nitrite-oxidizing activity as a result of partial recycling of nitrate to the nitrite pool by nitrate-reducing micro-organisms present in anaerobic microsites of the soil [36], by heterotrophic or mixotrophic activity of the nitriteoxidizing bacteria [37,38] or by dissimilatory nitrate reduction or denitrification by these bacteria [39]. 4.2.4.…”

Section: Spatial Variationmentioning

confidence: 99%

Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil

Both¹,

Gerards²,

Laanbroek³

1992

FEMS Microbiology Letters

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The temporal and spatial distribution of the nitrite‐oxidizing community of a non‐fertilized, semi‐natural grassland soil was studied to obtain more insight into the possible variation in nitrate production in this soil throughout the year. Data describing the size, potential nitrite‐oxidizing activity and serotype composition of the nitrite‐oxidizing community are reported. In addition, several abiotic soil parameters potentially related to the activity of this community were measured. Whereas numbers and potential activities largely varied with time and place, the specific affinity for nitrite oxidation, defined as the ratio Vmax/Km, was relatively constant. The serotypes Nitrobacter agilis, N. winogradskyi and N. hamburgensis were all present in the top 5‐cm soil in every 500‐g sample examined, showing that these species co‐exist in this soil.

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Section: Spatial Variationmentioning

confidence: 99%

Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil

Both¹,

Gerards²,

Laanbroek³

1992

FEMS Microbiology Letters

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“…With the exception of some acid and alkaline soils, chemolithotrophic bacteria are considered to be the dominant nitrifying bacteria [Z]. Several attempts have been made to estimate the nitrate production in soils by determining the activity or numbers of chemolithotrophic nitrifying bacteria [3,4]. The parameters of the nitrifying microflora can be determined by a number of different methods [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of nitrite concentration and pH on Most Probable Number enumerations of non-growing Nitrobacter spp

Laanbroek

Schotman

1991

FEMS Microbiology Ecology

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Enumerations of nitrite‐oxidizing bacteria in soil samples by a Most Probable Number technique, often showed relatively high cell numbers at a low nitrite concentration compared with the numbers of ammonium‐oxidizing bacteria. It was hypothesized that the high numbers enumerated at low nitrite concentration would represent non‐growing or organotrophically growing cells of nitrite‐oxidizing species. In this paper, the sensitivity of non‐growing Nitrobacter species to high nitrite concentrations as well as to low pH was examined. Different Nitrobacter species were pre‐cultured at 0.5 mM nitrite. Non‐growing cells differing in age were enumerated at different nitrite concentrations and pH values. The incubation period lasted for 5 months at 20°C. However, during the incubation periods of the older non‐growing cells, it appeared that a period of 5 months might have been too short for reaching constant numbers. Early stationary cells of all species that were studied appeared not to be affected by high nitrite concentrations or low pH. Eight‐ and 18‐month‐old non‐growing cells of Nitrobacter hamburgensis were also insensitive to 5 mM nitrite. The numbers of 8‐ and 18‐month‐old resting cells of N. vulgaris were only repressed by a combination of 5 mM nitrite and a low pH. Eight‐month‐old non‐growing cells of N. winogradskyi were sensitive to 5 mM irrespective of pH, but 18‐month‐old cells only to 5 mM nitrate at low pH. The numbers of 8‐ and 18‐month‐old resting cells of N. winogradskyi serotype agilis were repressed by low pH rather than high nitrite concentration. Hence, it was concluded that the large differences in numbers of nitrite‐oxidizing bacteria obtained with low and high nitrite concentrations in the incubation medium, was not likely to be due to the presence of non‐growing Nitrobacter species in soil samples, but rather to the existence of organotrophically growing Nitrobacter cells.

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The influence of spatiotemporal variability and adaptations to hypoxia on empirical relationships between soil acidity and vegetation

et al. 2012

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Soil acidity is well known to affect the species composition of natural vegetation. The physiological adaptations of plants to soil acidity and related toxicity effects and nutrient deficiencies are, however, complex, manifold and hard to measure. Therefore, generally applicable quantifications of mechanistic plant responses to soil acidity are still not available. An alternative is the semi‐quantitative and integrated response variable ‘indicator value for soil acidity’ (Rm). Although relationships between measured soil pH and Rm from various studies are usually strong, they often show systematic bias and still contain high residual variances. On the basis of a well‐documented national dataset consisting of 91 vegetation plots and a dataset with detailed, within‐plot, pH measurements taken at three periods during the growing season, it is shown that strong spatiotemporal variation of soil pH can be a critical source of systematic errors and statistical noise. The larger part of variation, however, could be explained by the moisture status of plots. For instance, Spearman's rho decreased from 93% for dry plots and 87% for moist plots to 59% for wet plots. The loss of relation between soil pH and Rm in the moderately acid to alkaline range at increasingly wetter plots is probably due to the establishment of aerenchyma‐containing species, which are able to control their rhizosphere acidity. Adaptation to one site factor (oxygen deficit) apparently may induce indifference for other environmental factors (Fe2+, soil pH). For predictions of vegetation response to soil acidity, it is thus important to take the wetness of plots into account. Copyright © 2012 John Wiley & Sons, Ltd.

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Nitrate reduction in the leaves and numbers of nitrifiers in the rhizosphere ofPlantago lanceolata growing in two contrasting sites

Cited by 19 publications

References 14 publications

Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil

Temporal and spatial variation in the nitrite-oxidizing bacterial community of a grassland soil

Effect of nitrite concentration and pH on Most Probable Number enumerations of non-growing Nitrobacter spp

The influence of spatiotemporal variability and adaptations to hypoxia on empirical relationships between soil acidity and vegetation

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