Abstract
Sugars signal the plant cell’s energy status and trigger proper responses to stresses, also aiming to sustain growth and developmental processes. The ability to sense intracellular sugar levels is of utmost importance for the cell survival. The finely tuned levels of the nonreducing disaccharide trehalose (Tre) and its precursor, trehalose-6-P (T6P), are related to those of sucrose (Suc), whose accumulation is reflected in an increase in T6P levels. T6P in turn inhibits the regulatory protein Snf1-related protein kinase 1 (SnRK1), triggering changes in the energy metabolism. Alterations in the Tre/T6P ratios act as a signal leading to several effects on plant metabolic, physiological, and developmental processes.
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