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ATP sensing in living plant cells reveals tissue gradients and stress dynamics of energy physiology
Valentina De Col,
Chia Pao Voon,
Mark D Fricker,
Ian Max Møller,
Boon Leong Lim,
Andreas J Meyer,
Posted 23 Jun 2017
bioRxiv DOI: 10.1101/153163 (published DOI: 10.7554/eLife.26770)
Posted 23 Jun 2017
Growth and development of plants is ultimately driven by light energy captured through photosynthesis. ATP acts as universal cellular energy cofactor fuelling all life processes, including gene expression, metabolism, and transport. Despite a mechanistic understanding of ATP biochemistry, ATP dynamics in the living plant have been largely elusive. Here we establish live ATP assessment in plants using the fluorescent protein biosensor ATeam1.03-nD/nA. We generate Arabidopsis sensor lines and investigate the sensor in vitro under conditions appropriate for the plant cytosol. We establish an assay for ATP fluxes in isolated mitochondria, and demonstrate that the sensor responds rapidly and reliably to ATP changes in planta. An ATP map of the Arabidopsis seedling highlights different ATP concentrations between tissues and in individual cell types, such as root hairs. Progression of hypoxia reveals substantial plasticity of ATP homeostasis in seedlings, demonstrating that ATP biochemistry can be monitored at work in the living plant.
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