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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/16577

Title: Alternative respiration as a primary defence during cadmium-induced mitochondrial oxidative challenge in Arabidopsis thaliana
Authors: Keunen, Els
Jozefczak, Marijke
Remans, Tony
Vangronsveld, Jaco
Cuypers, Ann
Issue Date: 2013
Citation: Environmental and experimental botany, 91, p. 63-73
Abstract: Plant growth and development can be highly restricted by environmental stressors such as cadmium (Cd) pollution. The mitochondrial non-phosphorylating alternative respiratory pathway, mediated by alternative oxidase (AOX), alternative NAD(P)H dehydrogenases (NDs) and uncoupling protein (UCP), was suggested to be crucial in the acclimation of plants to fluctuating environmental conditions. Therefore, we examined the effects of environmentally realistic Cd exposure (5 and 10 μM) on the alternative respiratory chain in Arabidopsis thaliana using a kinetic exposure setup. We demonstrated that during exposure to Cd, Arabidopsis seedlings show a mitochondrial oxidative challenge to which they acutely respond by increasing the transcript level of several AOX, ND and UCP isoforms in both roots and leaves. In addition, AOX protein levels increased during acute Cd exposure (2 and 24 h). Based on our data, we suggest the formation of a condensed non-phosphorylating electron transport chain (ETC) functioning through cytosolic NDs and AOX, with co-regulation of ND and AOX expression during Cd stress. Therefore, both enzymes might cooperate in the potential acclimation of Arabidopsis seedlings to environmentally realistic Cd exposure by modulating the extent of mitochondrial ROS production.
URI: http://hdl.handle.net/1942/16577
Link to publication: http://tarjomefa.com/wp-content/uploads/2017/03/6276-English-TarjomeFa.pdf
DOI: 10.1016/j.envexpbot.2013.02.008
ISI #: 000319790700007
ISSN: 0098-8472
Category: A1
Type: Journal Contribution
Validation: ecoom, 2014
Appears in Collections: Research publications

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