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During development of nodules and roots, the alfalfa early nodulin gene MsEnod12A is expressed adjacent to the meristem. Using transgenic alfalfa carrying a MsEnod12A promoter-gusA fusion, we investigated the regulation of MsEnod12A expression in mature nodules and roots by GUS assays and reverse transcription-PCR. We found that in alfalfa indeterminate nodules induced by various Fix- Rhizobium meliloti mutants and in spontaneous nodules devoid of rhizobia, MsEnod12A was expressed at the distal end when a persistent meristem was present. However, this gene was not expressed when the meristem was lacking in nodules arrested in development. The MsEnod12A-gusA fusion was introduced into Lotus corniculatus plants that form determinate nodules devoid of a persistent meristem. Using these plants we found MsEnod12A-gusA expression only in young nodules and a disappearance in mature nodules. Moreover, when alfalfa roots were treated with auxins a lateral band of MsEnod12A expression was observed surrounding the c...

MsEnod12A Expression Is Linked to Meristematic Activity During Development of Indeterminate and Determinate Nodules and Roots