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Communication dans un congrès

Reactivation of mitochondrial bioenergetics and dynamics during germination of Arabidopsis thaliana seed

Abstract :

Mitochondria are dynamic organelles in shoots and roots. Mitochondria move on F-actin using myosin motors, but movement can also result from remodelling of the actin cytoskeleton. This dynamism of mitochondria underpins their function and maintenance. For example, mitochondrial quality control underpins cell health and requires inter-mitochondrial fusion due to the uneven distribution of mtDNA within physically discrete mitochondria. Mitochondria are inactive in dry seed but must reactivate rapidly upon imbibition to provide ATP for germination. This reactivation requires not only a reactivation of mitochondrial metabolism but also of mitochondrial dynamics. Using a bioimaging approach we investigated reactivation using Arabidopsis as a model. Bioenergetic reactivation, visualised as the presence of a membrane potential, is almost immediate upon rehydration. However, reactivation of mitochondrial motility only occurs after transfer to optimal germination conditions. This late reactivation of mitochondrial motility appears specific: the actin cytoskeleton is present and dynamic early during imbibition as are other organelles that move in actin (e.g.ER). Reactivation of mitochondrial bioenergetics and dynamics is followed by dramatic reorganisation of the chondriome due to transient massive fusion, to form a perinuclear reticulum, followed by division. These data will be presented alongside results testing our hypothesis that the delay in activating mitochondrial motility is associated with the activation of mitochondrial quality control mechanisms to repair mtDNA damage incurred during maturation drying and imbibition.

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https://hal.univ-angers.fr/hal-02516619
Contributeur : Okina Université d'Angers <>
Soumis le : mardi 24 mars 2020 - 02:33:45
Dernière modification le : mercredi 25 mars 2020 - 01:40:21

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  • HAL Id : hal-02516619, version 1
  • OKINA : ua17123

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Citation

Gaël Paszkiewicz, David Macherel, David Logan. Reactivation of mitochondrial bioenergetics and dynamics during germination of Arabidopsis thaliana seed. International Congress on Plant Mitochondrial Biology, 2015, Wroclaw, Poland. ⟨hal-02516619⟩

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