Abstract：
:The flow of carbon from plant roots into soil supports a range of microbial processes and is therefore critical to ecosystem function and health. Pollution-induced stress, which influences rhizosphere C flow is of considerable potential importance, and therefore needs to be evaluated. This paper reports on a method, based on reporter gene technology, for quantifying pollutant effects on rhizosphere C flow. The method uses the lux-marked rhizobacterium Pseudomonas fluorescens, where bioluminescence output of this biosensor is directly correlated with the metabolic activity and reports on C flow in root exudate. Plantago lanceolata was treated with paraquat (representing a model pollutant stress) in a simple microcosm system. The lux-biosensor response correlated closely with C concentrations in the exudate and demonstrated that the pollutant stress increased the C flow from the plantago roots, 24 h after application of the herbicide. The lux-reporter system therefore potentially offers a technique for use in assessing the impact of pollutant stress on rhizosphere C flow through the soil microbial biomass.
journal_name
Chemospherejournal_title
Chemosphereauthors
Porteous F,Killham K,Meharg Adoi
10.1016/s0045-6535(00)00072-2subject
Has Abstractpub_date
2000-11-01 00:00:00pages
1549-54issue
10eissn
0045-6535issn
1879-1298pii
S0045-6535(00)00072-2journal_volume
41pub_type
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