Vacuolar sucrose cleavage prevents limitation of cytosolic carbohydrate metabolism and stabilizes photosynthesis under abiotic stress

The FEBS Journal
Jakob WeiszmannThomas Nägele

Abstract

Stabilization of central carbohydrate metabolism plays a key role in plant stress response. Carbohydrates are substrate for numerous metabolic and stress-responsive reactions and have been shown to be involved in diverse signalling processes on a whole-plant level. Regulation of enzymatic sucrose synthesis and degradation is well-known to be central to many stress-related processes as it significantly impacts stress tolerance. Leaf sucrose metabolism involves sucrose cleavage by invertases and ATP-consuming resynthesis catalysed by hexokinase and sucrose phosphate synthase. These reactions establish a metabolic cycle. To study the physiological role of sucrose cycling, a kinetic model was developed to simulate dynamics of subcellular sugar concentrations in Arabidopsis thaliana under combined cold and high-light stress. Model simulation revealed that subcellular reprogramming of invertase-driven sucrose cleavage varies substantially between natural accessions of Arabidopsis which differ in their cold tolerance levels. A stress-induced shift of sucrose cleavage from the cytosol into the vacuole could only be observed for the tolerant accession while the susceptible accession increased the cytosolic proportion of sucrose cleavage...Continue Reading

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Citations

Jul 31, 2019·The Plant Journal : for Cell and Molecular Biology·Lisa FürtauerThomas Nägele
Nov 2, 2019·International Journal of Molecular Sciences·Lisa FürtauerThomas Nägele
Dec 29, 2020·The Plant Journal : for Cell and Molecular Biology·Tatjana KleineDario Leister
Dec 10, 2019·Ecotoxicology and Environmental Safety·Chuan LiuLin Hao
Nov 22, 2021·Physiologia Plantarum·Charlotte SeydelThomas Nägele

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