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A complete picture of legume nodulation has yet to be elucidated. Most studies of the molecular mechanisms responsible for nodule organogenesis have focused on herbaceous legumes. We investigated the presence of a putative  ENOD2  gene and studied the temporal and organ-specific production of its transcripts in an ornamental woody legume,  Amur maackia . Primers derived from proline-rich pentapeptide repeats of conserved  ENOD2  sequences and the genomic DNA of  Amur maackia  were used to obtain a 543-bp PCR fragment. Southern and Northern blots were probed with this cloned fragment. The  Amur maackia  genome contained an  ENOD2  sequence that is similar to sequences in other species. Expression of the putative  ENOD2  gene was detected in roots, 4 days after rhizobial inoculation, but not in leaves or stems. New data on the characteristics of nodulin genes in woody legumes will be beneficial in clarifying the nature and evolution of nodulation in legumes and may have implications for developing sustainable nursery production protocols.

Early Nodulin Gene (ENOD2) Expression in Maackia amurensis Rupr. & Maxim. (Amur maackia)