Wavelike distributions of microbial populations along an artificial root moving through soil

In a previous paper, we described wavelike distributions of bacterial populations along roots of wheat, and hypothesized that one mechanism underlying these distributions might be growth and death cycles of microorganisms in response to a moving nutrient source, the root tip. Similar wavelike distri...

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Bibliographic Details
Published in:Microbial ecology 2000-08, Vol.40 (3), p.250-259
Main Authors: Bruggen, A.H.C. van, Semenov, A.M, Zelenev, V.V
Format: Article
Language:English
Subjects:
Bacteria
Carbon
DINAMICA DE POBLACIONES
DISTRIBUCION ESPACIAL
DISTRIBUTION SPATIALE
DYNAMIQUE DES POPULATIONS
EXSUDAT
EXUDADOS
EXUDATES
Exudation
MODELE DE SIMULATION
MODELOS DE SIMULACION
Plant roots
Population distributions
POPULATION DYNAMICS
RACINE
RAICES
RHIZOSPHERE
RIZOSFERA
Root systems
ROOT TIPS
ROOTS
SIMULATION MODELS
Sleeves
SOIL BACTERIA
Soil microorganisms
SPATIAL DISTRIBUTION
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Summary:In a previous paper, we described wavelike distributions of bacterial populations along roots of wheat, and hypothesized that one mechanism underlying these distributions might be growth and death cycles of microorganisms in response to a moving nutrient source, the root tip. Similar wavelike distributions in microbial biomass were obtained using a simulation model for growth and death of bacteria in relation to their substrate (BACWAVE). The model was parameterized with data from one experiment on rhizosphere bacterial populations along wheat roots, and compared against a similar but independent experiment. In experiments described in this paper, similar wavelike distributions in bacterial populations were observed in response to a single artificial exudate moving linearly through a soil that had been air-dry for almost 2 years. The period of the spatial waves was longer when the tip of the artificial exudate moved at a speed of 4.2 cm/day compared to a tip moving at 1.1 cm/day, but after transformation into the temporal domain, the periods of the waves were similar for both moving speeds. The observed distributions were simulated using the BACWAVE model with similar parameter values as derived from the experiment with wheat roots mentioned above. The results presented in this paper confirm our hypothesis that wavelike distributions of bacterial population along plant roots can arise from "exudates" released primarily from the root tip, without the need for additional exudation points.
ISSN:0095-3628
1432-184X
DOI:10.1007/s002480000030