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• W2520494319 abstract "In apple (Malus domestica Borkh.) sorbitol is the primary product of photosynthesis, the major translocated form of carbon, and a common fruit constituent and storage compound. Previous work on sorbitol metabolism has revealed a NADPH-dependent aldose 6-phosphate reductase (A6PR) in green tissues, and a NAD-dependent sorbitol dehydrogenase in nongreen tissues. Results here show a decrease in sorbitol dehydrogenase activity and an increase in A6PR activity as leaves developing in the spring undergo the transition from sink to source. Sorbitol dehydrogenase activity reached a minimum as A6PR peaked. These changes were related to increases in leaf carbohydrate levels, especially sorbitol, and to increases in rates of net photosynthesis. Studies conducted in the autumn on senescing leaves also showed changes in enzyme activites, leaf carbohydrate levels, and photosynthesis. At this time, however, sorbitol dehydrogenase increased in specific activity, whereas A6PR activity, leaf carbohydrates, and photosynthetic rates all decreased substantially. Other experiments showed differences in the ability of young and mature leaves to metabolize sorbitol and in the distribution of sorbitol enzymes in leaves at transitional developmental stages. The results suggest that sorbitol metabolism in apple is tightly controlled and may be related to mechanisms regulating partitioning or source and sink activity. Changes in the activities of enzymes responsible for synthesis and degradation of translocatable carbohydrates have been studied in several plants. Justification for such studies is due in part to the role these enzymes may play in the capacity of a photosynthesizing leaf to export carbohydrates. Equally important is the role these enzymes must play in mechanisms determining sink activity. Studies of the factors controlling activities of the enzymes involved could lead to a better understanding of control processes in photosynthesis, translocation, and storage (9). For both theoretical and practical reasons, developing leaves represent interesting models for studying metabolism of translocatable carbohydrates. Theoretically, information on transformation of a leaf from a heterotrophic, importing organ to an autotrophic, exporting organ should also provide insight into those mechanisms associated with onset of export. From a practical viewpoint a leaf can contribute to plant yield only when it is autotrophic and has begun to export. Previous workers have examined several aspects of heterotrophic-autotrophic transitions in leaves using sucrose or oligosac" @default.
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• W2520494319 date "1982-01-01" @default.
• W2520494319 modified "2023-09-27" @default.
• W2520494319 title "Sorbitol Metabolism and Sink-Source Interconversions in" @default.
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