NDLI: Galactosides in the rhizosphere: utilization by Sinorhizobium meliloti and development of a biosensor.

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Galactosides in the rhizosphere: utilization by Sinorhizobium meliloti and development of a biosensor.

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Galactosides in the rhizosphere: utilization by Sinorhizobium meliloti and development of a biosensor.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bringhurst, R. M. Cardon, Z. G. Gage, D. J.
Description	Author Affiliation: Bringhurst RM ( Departments of Molecular and Cell Biology, and Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269, USA.);
Abstract	Identifying the types and distributions of organic substrates that support microbial activities around plant roots is essential for a full understanding of plant-microbe interactions and rhizosphere ecology. We have constructed a strain of the soil bacterium Sinorhizobium meliloti containing a gfp gene fused to the melA promoter which is induced on exposure to galactose and galactosides. We used the fusion strain as a biosensor to determine that galactosides are released from the seeds of several different legume species during germination and are also released from roots of alfalfa seedlings growing on artificial medium. Galactoside presence in seed wash and sterile root washes was confirmed by HPLC. Experiments examining microbial growth on alpha-galactosides in seed wash suggested that alpha-galactoside utilization could play an important role in supporting growth of S. meliloti near germinating seeds of alfalfa. When inoculated into microcosms containing legumes or grasses, the biosensor allowed us to visualize the localized presence of galactosides on and around roots in unsterilized soil, as well as the grazing of fluorescent bacteria by protozoa. Galactosides were present in patches around zones of lateral root initiation and around roots hairs, but not around root tips. Such biosensors can reveal intriguing aspects of the environment and the physiology of the free-living soil S. meliloti before and during the establishment of nodulation, and they provide a nondestructive, spatially explicit method for examining rhizosphere soil chemical composition.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	8
Volume Number	98
Language	English
Publisher	National Academy of Sciences
Publisher Date	2001-04-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Biosensing Techniques Galactosides Metabolism Sinorhizobium Meliloti DNA Primers Fabaceae Microbiology Genes, Reporter Green Fluorescent Proteins Luminescent Proteins Plants, Medicinal Symbiosis Research Support, Non-U.S. Gov't Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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