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https://locus.ufv.br//handle/123456789/24507
Tipo: | Artigo |
Título: | The mitochondrial thioredoxin system contributes to the metabolic responses under drought episodes in Arabidopsis |
Autor(es): | Fonseca-Pereira, Paula da Daloso, Danilo M. Gago, Jorge Silva, Franklin Magnum de Oliveira Condori-Apfata, Jorge A. Florez-Sarasa, Igor Tohge, Takayuki Reichheld, Jean-Philippe Nunes-Nesi, Adriano Fernie, Alisdair R. Araujo, Wagner L. |
Abstract: | Thioredoxins (Trxs) modulate metabolic responses during stress conditions; however, the mechanisms governing the responses of plants subjected to multiple drought events and the role of Trxs under these conditions are not well understood. Here we explored the significance of the mitochondrial Trx system in Arabidopsis following exposure to single and repeated drought events. We analyzed the previously characterized NADPH-dependent Trx reductase A and B double mutant (ntra ntrb) and two independent mitochondrial thioredoxin o1 (trxo1) mutant lines. Following similar reductions in relative water content (∼50%), Trx mutants subjected to two drought cycles displayed a significantly higher maximum quantum efficiency (Fv/Fm) and were less sensitive to drought than their wild-type counterparts and than all genotypes subjected to a single drought event. Trx mutant plants displayed a faster recovery after two cycles of drought, as observed by the higher accumulation of secondary metabolites and higher stomatal conductance. Our results indicate that plants exposed to multiple drought cycles are able to modulate their subsequent metabolic and physiological response, suggesting the occurrence of an exquisite acclimation in stressed Arabidopsis plants. Moreover, this differential acclimation involves the participation of a set of metabolic changes as well as redox poise alteration following stress recovery. |
Palavras-chave: | Arabidopsis thaliana Metabolic acclimation Mitochondrial Trx system Respiration Tricarboxylic acid cycle Water limitation |
Editor: | Plant and Cell Physiology |
Tipo de Acesso: | Open Access |
URI: | https://doi.org/10.1093/pcp/pcy194 http://www.locus.ufv.br/handle/123456789/24507 |
Data do documento: | Jan-2019 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
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artigo.pdf | texto completo | 2,39 MB | Adobe PDF | Visualizar/Abrir |
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