Title: Neutral invertase, hexokinase and mitochondrial ROS homeostasis. Emerging links between sugar metabolism, sugar signaling and ascorbate synthesis
Authors: Xiang, Li ×
Li, Yi
Rolland, Filip
Van den Ende, Wim #
Issue Date: Oct-2011
Publisher: Landes Bioscience
Series Title: Plant Signalling & Behavior vol:6 issue:10 pages:1-7
Abstract: Alkaline/neutral invertases (A/NInvs)
are unique to plants and
photosynthetic bacteria. Although considerable
advances have been made in
our understanding of sucrose metabolic
enzymes in plants, the function of A/NInvs
remained puzzling. In a recent
study, we have analyzed the subcellullar
localization of a cytosolic (At-A/NInvG,
At1g35580) and a mitochondrial
(At-A/N-InvA, At1g56560) Arabidopsis
A/N-Inv. Unexpectedly, At-A/N-InvA
knockout plants showed a more severe
growth defect than At-A/N-InvG knockout
plants and a link between the two
A/N-Invs and oxidative stress defense
was found. Overexpression of At-A/NInvA
and At-A/N-InvG in leaf mesophyll
protoplasts reduced the activity of the
ascorbate peroxidase 2 (APX2) promoter,
that was stimulated by hydrogen peroxide
and abscisic acid. It is discussed here
how sugars and ascorbate might contribute
to mitochondrial reactive oxygen
species homeostasis. We hypothesize that
both mitochondrial and cytosolic A/NInvs
and mitochondria-associated hexokinases
are key mediators, integrating
metabolic and sugar signaling processes.
ISSN: 1559-2316
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Physiology of Plants and Micro-organisms Section - miscellaneous
× corresponding author
# (joint) last author

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