Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on October 19, 2007; 10.1104/pp.107.106146

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Received July 24, 2007
Accepted October 12, 2007

Differential expression of the TFIIIA regulatory pathway in response to salt stress between Medicago truncatula genotypes

Laura de Lorenzo , Francisco Merchan , Sandrine Blanchet , Manuel Megias , Florian Frugier , Martin Crespi *, and Carolina Sousa

Departamento de Microbiologia y Parasitologia, Facultad de Farmacia, Universidad de Sevilla, c/ Profesor Garcia Gonzalez, 2. 41012 Sevilla, Espana; Institut des Sciences du Vegetal, Centre National de la Recherche Scientifique, Avenue de la Terrasse bat 23, F-91198 Gif-sur-Yvette Cedex, France

* Corresponding author; email: crespi{at}isv.cnrs-gif.fr.

Soil salinity is one of the most-significant abiotic stresses for crop plants, including legumes. These plants can establish root symbioses with nitrogen-fixing soil bacteria and are able to grow in nitrogen-poor soils. Medicago truncatula varieties show diverse adaptive responses to environmental conditions, such as saline soils. We have compared the differential root growth of two genotypes of M. truncatula (108-R and Jemalong A17) in response to salt stress. Jemalong A17 is more tolerant to salt stress than 108-R regarding both root and nodulation responses independently of the nitrogen status of the media. A dedicated macroarray containing 384 genes linked to stress responses was used to compare root gene expression during salt stress in these genotypes. Several genes potentially associated with the contrasting cellular responses of these plants to salt stress were identified as expressed in the more tolerant genotype even in the absence of stress. Among them, a homologue of the abiotic-stress related CorA1 (Cold-Regulated A1) gene and a TFIIIA-related transcription factor, MtZpt2-1, known to regulate the former gene. Two MtZpt2 TFs (MtZpt2-1 and MtZpt2-2) were found in Jemalong A17 plants and showed increased expression in roots when compared to 108-R. Overexpression of these TFs in the sensitive genotype 108-R, but not in Jemalong A17, led to increased root growth under salt stress, suggesting a role for this pathway in the adaptive response to salt stress of these M. truncatula genotypes.




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