<i>enod40</i> induces dedifferentiation and division of root cortical cells in legumes

DOI Web Site 被引用文献3件
  • Celine Charon
    Institut des Sciences Végétales, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, F-91198 Gif sur Yvette Cedex, France; and Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary
  • Christina Johansson
    Institut des Sciences Végétales, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, F-91198 Gif sur Yvette Cedex, France; and Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary
  • Eva Kondorosi
    Institut des Sciences Végétales, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, F-91198 Gif sur Yvette Cedex, France; and Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary
  • Adam Kondorosi
    Institut des Sciences Végétales, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, F-91198 Gif sur Yvette Cedex, France; and Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary
  • Martin Crespi
    Institut des Sciences Végétales, Centre National de la Recherche Scientifique, 1 Avenue de la Terrasse, F-91198 Gif sur Yvette Cedex, France; and Institute of Genetics, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary

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<jats:p> Under nitrogen-limiting conditions <jats:italic>Rhizobium meliloti</jats:italic> can establish symbiosis with <jats:italic>Medicago</jats:italic> plants to form nitrogen-fixing root nodules. Nodule organogenesis starts with the dedifferentiation and division of root cortical cells. In these cells the early nodulin gene <jats:italic>enod40</jats:italic> , which encodes an unusually small peptide (12 or 13 amino acids), is induced from the beginning of this process. Herein we show that <jats:italic>enod40</jats:italic> expression evokes root nodule initiation. ( <jats:italic>i</jats:italic> ) Nitrogen-deprived transgenic <jats:italic>Medicago truncatula</jats:italic> plants overexpressing <jats:italic>enod40</jats:italic> exhibit extensive cortical cell division in their roots in the absence of <jats:italic>Rhizobium</jats:italic> . ( <jats:italic>ii</jats:italic> ) Bombardment of <jats:italic>Medicago</jats:italic> roots with an <jats:italic>enod40</jats:italic> -expressing DNA cassette induces dedifferentiation and division of cortical cells and the expression of another early nodulin gene, <jats:italic>Msenod12A</jats:italic> . Moreover, transient expression of either the <jats:italic>enod40</jats:italic> region spanning the oligopeptide sequence or only the downstream region without this sequence induces these responses. Our results suggest that the cell-specific growth response elicited by <jats:italic>enod40</jats:italic> is involved in the initiation of root nodule organogenesis. </jats:p>

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