Seasonal variations in soluble sugars and starch within woody stems of Cornus sericea L - PubMed

Seasonal variations in soluble sugars and starch within woody stems of Cornus sericea L

E N Ashworth et al. Tree Physiol. 1993 Dec.

Abstract

Carbohydrate composition changed seasonally in red osier dogwood (Cornus sericea L.) stem tissues. Starch concentration was highest in fall and decreased to a minimum in midwinter. Coincident with the breakdown of starch in fall, there was an increase in the concentrations of soluble sugars. Soluble sugars were present in highest concentrations in midwinter. Glucose, fructose, sucrose, and raffinose were the predominant soluble sugars present in both bark and wood tissues. In early spring, the soluble sugar concentration decreased and the concentration of starch increased. The seasonal interchange between sugars and starch did not simply reflect a general quantitative shift in the balance between sugars and starch because qualitative changes in soluble sugars were also noted. The most striking changes involved the trisaccharide raffinose. Raffinose was barely detectable in summer and early fall, but increased to one fifth and one third of the total soluble sugars in January samples of bark and wood tissues, respectively. The potential physiological role of raffinose in overwintering red osier dogwood tissue is discussed.

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