Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/14017
Tipo: Artigo
Título: Photosynthetic and metabolic acclimation to repeated drought events play key roles in drought tolerance in coffee
Autor(es): Menezes-Silva, Paulo E.
Sanglard, Lilian M. V. P.
Ávila, Rodrigo T.
Morais, Leandro E.
Martins, Samuel C. V.
Nobres, Priscilla
Patreze, Camila M.
Ferreira, Marcio A.
Araújo, Wagner L.
Fernie, Alisdair R.
DaMatta, Fábio M.
Abstract: Over the last decades, most information on the mechanisms underlying tolerance to drought has been gained by considering this stress as a single event that happens just once in the life of a plant, in contrast to what occurs under natural conditions where recurrent drought episodes are the rule. Here we explored mechanisms of drought toler- ance in coffee (Coffea canephora) plants from a broader perspective, integrating key aspects of plant physiology and biochemistry. We show that plants exposed to multiple drought events displayed higher photosynthetic rates, which were largely accounted for by biochemical rather than diffusive or hydraulic factors, than those submitted to drought for the first time. Indeed, these plants displayed higher activities of RuBisCO and other enzymes associated with car- bon and antioxidant metabolism. Acclimation to multiple drought events involved the expression of trainable genes related to drought tolerance and was also associated with a deep metabolite reprogramming with concordant altera- tions in central metabolic processes such as respiration and photorespiration. Our results demonstrate that plants exposed to multiple drought cycles can develop a differential acclimation that potentiates their defence mechanisms, allowing them to be kept in an ‘alert state’ to successfully cope with further drought events.
Palavras-chave: Carbon metabolism
Differential acclimation
Drought memory
Metabolic acclimation
Oxidative stress
Photosynthesis
Water deficit
Editor: Journal of Experimental Botany
Tipo de Acesso: Open Access
URI: https://doi.org/10.1093/jxb/erx211
http://www.locus.ufv.br/handle/123456789/14017
Data do documento: 25-Mai-2017
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