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Título

Flavodoxin overexpression reduces cadmium-induced damage in alfalfa root nodules

AutorShvaleva, Alla; Coba de la Peña, Teodoro ; Rincón, Ana ; Morcillo, César N. ; García de la Torre, Vanesa S.; Lucas, M. Mercedes ; Pueyo, José Javier
Palabras claveAlfalfa
Cadmium
Flavodoxin
Medicago sativa
Nodule
Sinorhizobium meliloti
Fecha de publicación8-abr-2009
EditorSpringer
CitaciónPlant and Soil
ResumenFlavodoxins are electron carrier flavoproteins that are involved in the response to oxidative stress in bacteria and cyanobacteria. Recently, we obtained Sinorhizobium meliloti bacteria that overexpressed a flavodoxin from the cyanobacterium Anabaena variabilis [Redondo et al. (2009) Plant Physiology 149:1166–1178]. In the present work, tolerance to cadmium was evaluated in free-living transformed S. meliloti and in alfalfa plants nodulated by the flavodoxin-overexpressing rhizobia, in comparison with plants nodulated by wild-type bacteria. Overexpression of flavodoxin protected free-living S. meliloti from cadmium toxicity and had a positive effect on nitrogen fixation of alfalfa plants subjected to cadmium stress. Flavodoxin notably reduced cadmiuminduced structural and ultrastructural alterations in alfalfa nodules. Putative protection mechanisms in flavodoxin-overexpressing nodules are discussed. Flavodoxin could have applications as a biotechnological tool to improve the symbiotic performance of alfalfa and other legumes in cadmium polluted soils.
Descripción13 pages and figures
Versión del editorhttp://dx.doi.org/10.1007/s11104-009-9985-1
URIhttp://hdl.handle.net/10261/13443
DOI10.1007/s11104-009-9985-1
ISSN0032-079x
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