Artículo
Elevated CO2 induces root defensive mechanisms in tomato plants when dealing with ammonium toxicity
Autor/es | Vega Mas, Izargi
Pérez Delgado de Torres, Carmen María Marino, Daniel Fuertes Mendizábal, Teresa González Murua, Carmen Márquez Cabeza, Antonio José Betti, Marco Estavillo, José María González Moro, María Begoña |
Departamento | Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular |
Fecha de publicación | 2017 |
Fecha de depósito | 2020-11-03 |
Publicado en |
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Resumen | An adequate carbon supply is fundamental for plants to thrive under ammonium stress. In this work, we studied the mechanisms involved in tomato (Solanum lycopersicum L.) response to ammonium toxicity when grown under ambient ... An adequate carbon supply is fundamental for plants to thrive under ammonium stress. In this work, we studied the mechanisms involved in tomato (Solanum lycopersicum L.) response to ammonium toxicity when grown under ambient or elevated CO2 conditions (400 or 800 p.p.m. CO2). Tomato roots were observed to be the primary organ dealing with ammonium nutrition. We therefore analyzed nitrogen (N) and carbon (C) metabolism in the roots, integrating the physiological response with transcriptomic regulation. Elevated levels of CO2 preferentially stimulated root growth despite the high ammonium content. The induction of anaplerotic enzymes from the tricarboxylic acid (TCA) cycle led to enhanced amino acid synthesis under ammonium nutrition. Furthermore, the root transcriptional response to ammonium toxicity was improved by CO2enriched conditions, leading to higher expression of stress-related genes, as well as enhanced modulation of genes related to signaling, transcription, transport and hormone metabolism. Tomato roots exposed to ammonium stress also showed a defense-like transcriptional response according to the modulation of genes related to detoxification and secondary metabolism, involving principally terpenoid and phenolic compounds. These results indicate that increasing C supply allowed the co-ordinated regulation of root defense mechanisms when dealing with ammonium toxicity. |
Identificador del proyecto | BFI-2010-365
IT932-16 AGL2015-64582-C3-2-R AGL2014-54413-R |
Cita | Vega Mas, I., Pérez Delgado de Torres, C.M., Marino, D., Fuertes Mendizábal, T., González Murua, C., Márquez Cabeza, A.J.,...,González Moro, M.B. (2017). Elevated CO2 induces root defensive mechanisms in tomato plants when dealing with ammonium toxicity. Plant and Cell Physiology, 58 (12), 2112-2125. |
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