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Analysis of Infection Thread Development Using Gfp- and DsRed-Expressing Sinorhizobium meliloti

Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut 06269

Received 2 May 2002/ Accepted 28 August 2002

Sinorhizobium meliloti growth inside infection threads was monitored after inoculation of alfalfa with red- or green-tagged bacteria. Most threads were populated with single bacterial types. Mixed infections were present but gave mixed nodules less often than expected. These patterns are explained by a model describing bacterial growth during infection.

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