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Seasonal changes in sugar (a), abscisic acid (ABA; b), jasmonic acid (JA; c), cinnamic acid (d), p-coumaric acid (e), ferulic acid (f), and sinapic acid (g) contents in overwintering leaf tissues during cold acclimation (from Sept. 27 to Jan. 19) and deacclimation (from Jan. 19 to Apr. 18); n = 3. The lowercase letters represent significant differences among sampling dates (p < 0.05), which were calculated using Fisher’s least significant difference test.
