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The objective of this study was to determine how soluble carbohydrates were partitioned and metabolized in apple mature source leaves, young sink leaves, and stems in response to water stress. A solut...ion of [^<14>C] glucose, [^<14>C] sucrose, or [^<14>C] sorbitol was applied to apple (Malus domestica Borkh. 'Red Jonathan') shoots which had previously experienced either water stress or non-stressed conditions. Mature source leaves had higher conversions of labeled [^<14>C] glucose and [^<14>C] sucrose to sorbitol with higher sorbitol to sucrose ratios than young sink leaves and stems. Young sink leaves and stems had higher conversions of labeled [^<14>C] glucose, [^<14>C] sucrose and [^<14>C] sorbitol to fructose than mature leaves. As leaf water potential decreased from -1.5MPa to -3.0MPa, the conversions of [^<14>C] glucose to sorbitol increased from 12 to 25% of total ^<14>C-soluble carbohydrate in young sink leaves and from 20 to 30% in mature leaves. Water stress also stimulated the conversion of [^<14>C] sucrose to fructose and glucose, the necessary substrates for sorbitol synthesis. Our results suggest that sorbitol accumulation in water-stressed mature leaves was due to increased rates of glucose conversion to sorbitol.続きを見る
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Mendeley出力
KJ00004506881