The Flegr's frozen plasticity model (class V) differs from the Mayer's Genetic revolution-based model (class IV) by including theory of evolutionary stable strategies for description of behavior of alleles in genetically polymorphic population and by including the conception of accumulation of permanently frozen traits by sorting for stability.
SEX1 plays an essential role in the cold-induced starch degradation, sugar accumulation, and freezing tolerance enhancement during an early phase of cold acclimation [ 48].
For quantitative analysis of the extent of renal DDC accumulation, previously frozen kidneys were thawed, weighed, and homogenized in buffer containing 50 m M Tris-HCl and 0.005% Triton X-100, pH 7.4 (1:7 w/v), using Heidolph RZR 2020 homogenizer (Heidolph Instruments GmbH & Co. KG, Schwabach, Germany).
# Analysis of frozen samples.
Several lines of evidence suggest that cold-induced sugar accumulation enhances the degree of plant freezing tolerance [ 54].
The cold-responsive cellular events include modifications of lipid composition in the cellular membranes and accumulation of osmoprotectants, including anti-freeze proteins, proline, and sugars [ 42- 45].
Cold activation of the HOG pathway might be physiologically important because Hog1-dependent accumulation of glycerol would protect yeast from freezing.
H NMR analysis of the Arabidopsis metabolome, during freezing, revealed that the application of LPC altered biochemical pathways resulting in the accumulation of specific metabolites, leading to enhanced freezing tolerance.
Arabidopsis sfr4 mutant plants, defective in the accumulation of free sugars, treated with LPC, exhibited freezing sensitivity similar to that of untreated controls.
In the present study, application of ANE or LPC resulted in a significantly enhanced accumulation of total soluble sugars in response to freezing, as compared to untreated controls.
