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Seasonal changes in concentrations of glucose (A), fructose (B), sucrose (C), mannose (D), raffinose (E) and starch (F) in flower buds of R. nigrum ‘Narve Viking’ and ‘Titania’ from the end of September to mid-April the following year. During the winter season, plants were grown at ambient or slightly elevated temperatures. Values are means ± SE of n = 5–6.
