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Negative short-term salt effects on the soybean–Bradyrhizobium japonicum interaction and partial reversion by calcium addition

Resumen
The short-term (2 h) effects of salt stress (50 and 150 mM NaCl) on early events of soybean– Bradyrhizobium japonicum (rhizobia) interaction were analysed, determining the following parameters in root hair with or without calcium addition: deformation, apoplastic superoxide radical production (O2⚫–), root hair death and sodium/potassium ion content. We also analysed whether this short-term salt stress influenced later formation of crown and noncrown [ver mas...]
The short-term (2 h) effects of salt stress (50 and 150 mM NaCl) on early events of soybean– Bradyrhizobium japonicum (rhizobia) interaction were analysed, determining the following parameters in root hair with or without calcium addition: deformation, apoplastic superoxide radical production (O2⚫–), root hair death and sodium/potassium ion content. We also analysed whether this short-term salt stress influenced later formation of crown and noncrown nodules, determining the number and weight of nodules. The negative effect of salt stress on these characters was attenuated by the addition of 5 mM CaCl2. We also analysed the expression of pathogenesis-related proteins (PRP) genes PR-1, PR-2, PR-3, and four isoforms of PR-5. The expression of PR-2 increased under saline conditions and decreased in osmotic treatment and saline treatment supplemented with calcium in the presence of the symbiont. The changes in PR-2 expression levels, together with the death of root hairs provide a possible mechanism for the inhibition of infection by the symbiont under salinity, and suggests a possible overlap with responses to plant pathogens. [Cerrar]
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Autor
Muñoz, Nacira Belen;   Rodriguez, Marianela;   Robert, German;   Lascano, Hernan Ramiro;  
Fuente
Functional Plant Biology 41 (1) : 96-105 ( 2013)
Fecha
2013-09-05
Editorial
CSIRO Publishing
ISSN
1445-4408
1445-4416 (online)
URI
http://hdl.handle.net/20.500.12123/10933
https://www.publish.csiro.au/fp/FP13085
DOI
https://doi.org/10.1071/FP13085
Formato
pdf
Tipo de documento
artículo
Palabras Claves
Root Nodulation; Osmotic Stress; Estrés Osmótico; Nodulación; Bradyrhizobium japonicum; Ionic Homeostasis; Nodulation; Pathogenic-Related Proteins; Symbiotic Interaction; Estrés Salino;
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Excepto donde se diga explicitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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