Plant mitochondria—more active than ever!

Gardeström, Per

doi:10.1111/j.1399-3054.2006.00847.x

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…There is an increasing body of evidence that abiotic stresses perceived by plant cells induce an adaptive response through ROS as a cell signalling element (Møllera & Gardestromb 2007; Foyer & Noctor 2009). NADPH oxidase is an important ROS‐generating system and its role in stress response has been well documented.…”

Section: Discussionmentioning

confidence: 99%

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance

Nie

Wang

Xia

et al. 2012

Plant Cell & Environment

131

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Brassinosteroids (BRs) are involved in the regulation of plant growth, development and stress responses. While the signalling pathways for BR-regulated plant growth and development are well studied, the mechanisms by which BRs regulate plant stress tolerance remain largely unclear. Here we showed that 24-epibrassinolide (EBR), which induced tolerance to oxidative and heat stress in tomato, was also capable of elevating the transcript levels of RBOH1, MPK1 and MPK2, increasing apoplastic H2O2 accumulation, and enhancing activation of MPK1/2. Virus-induced gene silencing of RBOH1, MPK1, MPK2 and MPK1/2 resulted in reduced stress tolerance. Silencing of RBOH1 had no effect on the transcripts of MPK1 and MPK2 but inhibited MPK1/2 activation and H2O2 accumulation. Silencing of either MPK1 or MPK2, on the other hand, reduced RBOH1 transcript, H2O2 accumulation and MPK1/2 activity. BR-induced tolerance and MPK1/2 activation were compromised in RBOH1-, MPK2-and MPK1/2-silenced plants but not in MPK1-silenced plants. These results suggested that MPK2 played a more critical role than MPK1 in EBRinduced apoplastic H2O2 accumulation. RBOH1, MPK1 and MPK2 were involved in the stress tolerance and BR-induced stress tolerance likely involved a positive feedback loop among RBOH1, H2O2 and MPK2, leading to sustained apoplastic accumulation of H2O2 and related signalling processes.

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Section: Discussionmentioning

confidence: 99%

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance

Nie

Wang

Xia

et al. 2012

Plant Cell & Environment

131

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Mitochondrial bioenergetics and enzymatic antioxidant defense differ in Paraná pine cell lines with contrasting embryogenic potential

Furlanetto

Kaziuk

Martinez

et al. 2021

Free Radical Research

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Mitochondrial biogenesis as revealed by mitochondrial transcript profiles during germination and early seedling growth in wheat

et al. 2007

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Germination of imbibed embryos is the initial stage of plant development that is accompanied by the burst of mitochondrial respiration. To understand the process of mitochondrial biogenesis during this critical stage in wheat development, we monitored changes in mitochondrial transcript profiles during the first 3 days by adopting a newly devised macroarray system. The whole experiment was conducted in the dark to avoid influences of photosynthesis. Dry quiescent embryos started respiration rapidly after imbibition and the rate of oxygen uptake increased to peak at the first day followed by a continuous decrease until the third day under this condition. Both the cytochrome and alternative electron transport pathways appeared to contribute to this initial burst. Shoot and root growth was also remarkable during this period. Mitochondrial transcriptome was studied by macroarray analysis using 28 mitochondrial protein-coding genes, 4 nuclear encoded mitochondria-targeted genes and 2 nuclear genes as control. All transcripts were present in dry embryos at different initial levels, and a large variability was observed in their abundance among individual genes throughout the tested period. Gene expression was categorized into four clusters according to the profiles of individual transcript accumulation. A majority of the genes encoding subunits of the respiratory complexes belonged to two major clusters, the time course of transcript accumulation of one cluster agreeing with that of respiratory development and the other remaining at high constant levels. The macroarray system devised in this study should be useful in monitoring mitochondrial biogenesis under various growth conditions and at different developmental stages in cereals.

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Plant mitochondria—more active than ever!

Cited by 4 publications

References 34 publications

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance

Mitochondrial bioenergetics and enzymatic antioxidant defense differ in Paraná pine cell lines with contrasting embryogenic potential

Mitochondrial biogenesis as revealed by mitochondrial transcript profiles during germination and early seedling growth in wheat

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Plant mitochondria—more active than ever!

Cited by 4 publications

References 34 publications

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H2O2 generation and stress tolerance

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H2O2 generation and stress tolerance

Mitochondrial bioenergetics and enzymatic antioxidant defense differ in Paraná pine cell lines with contrasting embryogenic potential

Mitochondrial biogenesis as revealed by mitochondrial transcript profiles during germination and early seedling growth in wheat

Contact Info

Product

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Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance

Silencing of tomato RBOH1 and MPK2 abolishes brassinosteroid‐induced H₂O₂ generation and stress tolerance