A qualitative model for the mechanism of sugar accumulation in cold-stressed plant tissues |
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Authors: | Yannis Gounaris |
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Institution: | (1) Department of Agriculture, University of Thessaly, Fytokou street, 38446 New Ionia, Magnesia, Greece |
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Abstract: | Summary Low temperatures induce the accumulation of soluble sugars in plant cells. An attempt is made to identify the primary site
of action of low temperatures and the sequence of physiological and biochemical events leading to sugar accumulation. The
integration of all the available information points to a central role of increased intracellular calcium ion concentration
generated by the inhibition of ATPases concerned with its homeostasis. A positive role of a cold-induced dysfunction of mitochondrial
and chloroplast electron flow is also proposed. The biological significance of an explanation of this physiological response
to a stress factor relies on its categorization into the major family of those employing alternative energy-producing pathways
under stress conditions. More specifically, a connection of sugar mobilization to the needs of the cold-stressed cell to employ
fermentative energy-producing mechanisms is made. From this ankle of view, new ways of genetically modifying the ability of
plant cells to accumulate sugars become obvious. |
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Keywords: | Chilling low temperature mitochondria plastid potato |
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