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Plant Cell, Vol. 11, 1953-1966, October 1999, Copyright © 1999, American Society of Plant Physiologists

Alteration of enod40 Expression Modifies Medicago truncatula Root Nodule Development Induced by Sinorhizobium meliloti

Celine Charona, Carolina Sousaa, Martin Crespia, and Adam Kondorosia,b
a Institut des Sciences Végétales, Centre National de la Recherche Scientifique, F-91198 Gif sur Yvette, France
b Institute of Genetics, Biological Research Center, P.O. Box 521, H-6701 Szeged, Hungary

Correspondence to: Martin Crespi, Martin.Crespi{at}isv.cnrs-gif.fr (E-mail), 33-1-69823695 (fax)

Molecular mechanisms involved in the control of root nodule organogenesis in the plant host are poorly understood. One of the nodulin genes associated with the earliest phases of this developmental program is enod40. We show here that transgenic Medicago truncatula plants overexpressing enod40 exhibit accelerated nodulation induced by Sinorhizobium meliloti. This resulted from increased initiation of primordia, which was accompanied by a proliferation response of the region close to the root tip and enhanced root length. The root cortex of the enod40-transformed plants showed increased sensitivity to nodulation signals. T1 and T2 descendants of two transgenic lines with reduced amounts of enod40 transcripts (probably from cosuppression) formed only a few and modified nodulelike structures. Our results suggest that induction of enod40 is a limiting step in primordium formation, and its function is required for appropriate nodule development.




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