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Gene Expression， Tissue Distribution and Activity Regulation of NAD+- dependent Sorbitol Dehydrogenase in Apple
Qiu-Ping Ren1, Shu-Mei Zhou2, Xiu-Ling Wang2*
1Agricultural College, Liaocheng University, Liaocheng, 252059, China; 2State Key Laboratory of Crop Biology, Shandong Agricultural University, Taian 271018, China
Abstract: Sorbitol is the major photosynthetic product in woody Rosaceae. It is synthesized in mature leaves and is imported into fruit and other sink tissue. In these sink tissues， sorbitol is not stored but converted to other metabolites. NAD+-dependent sorbitol dehydrogenase (NAD-SDH， EC 1.1.1.14)， responsible for the oxidation of sorbitol to fructose， plays the key role in sorbitol metabolism in apple. The content and activity of NAD-SDH affect directly the transportation and partitioning of sorbitol among sink tissues. Recent progress on gene expression， tissue distribution and activity regulation of NAD-SDH in apple are summarized and discussed in this paper.
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