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Related Experiment Video

Updated: May 13, 2025

An Induction System for Clustered Stomata by Sugar Solution Immersion Treatment in Arabidopsis thaliana Seedlings

An Induction System for Clustered Stomata by Sugar Solution Immersion Treatment in Arabidopsis thaliana Seedlings

Published on: February 15, 2019

Subcellular plant carbohydrate metabolism under elevated temperature.

Charlotte Seydel^1,2, Martin Heß³, Laura Schröder²

¹LMU München, Faculty of Biology, Plant Development, Großhaderner Str. 2-4, Planegg 82152, Germany.

Plant Physiology

|April 16, 2025

Summary

Heat acclimation in Arabidopsis thaliana at 34°C enhances thermotolerance by stabilizing cytosolic sucrose. This involves a shift in sucrose cleavage to the vacuole, regulated by fructose and glucose inhibition.

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Area of Science:

Plant Physiology
Environmental Stress Response
Molecular Biology

Background:

Changing environmental temperatures induce plant acclimation responses, enhancing thermotolerance.
Elevated temperatures disrupt plant membrane systems, photosynthesis, and carbohydrate metabolism by altering protein function and enzyme activity.

Purpose of the Study:

To investigate the effects of different temperature regimes on heat acclimation and thermotolerance in Arabidopsis thaliana.
To determine the role of subcellular carbohydrate concentrations in plant heat tolerance.

Main Methods:

Quantified heat tolerance using electrolyte leakage assays and chlorophyll fluorescence measurements.
Determined subcellular carbohydrate concentrations via non-aqueous fractionation.
Utilized serial block-face scanning electron microscopy for 3D reconstruction of mesophyll cells and compartments.

Main Results:

Seven days of heat acclimation at 34°C between 32°C and 38°C significantly increased tissue heat tolerance.
Cytosolic sucrose concentrations were stabilized by shifting sucrose cleavage into the vacuole.
Fructose and glucose inhibited invertase-driven cytosolic sucrose cleavage, acting as competitive and non-competitive inhibitors, respectively.

Conclusions:

A sucrose concentration gradient exists from the cytosol to the vacuole in heat-acclimated Arabidopsis thaliana.
This gradient likely influences the physiological role and transport direction of sugars across cellular membranes.
Understanding these mechanisms is crucial for improving plant resilience to thermal stress.