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Fig. 3 | Annals of Forest Science

Fig. 3

From: Short-day photoperiods affect expression of genes related to dormancy and freezing tolerance in Norway spruce seedlings

Fig. 3

Mean weekly apical shoot elongation of seedlings kept indoors and seedlings transferred outdoors after termination of SD (short day) treatment, which was done in an indoor blackout compartment. SD treatments (7, 14, 21, and 28 days) with a photoperiod of 11 h started on July 15 (day 0). Seedlings were then measured on July 22 (day 7), July 29 (day 14), Aug. 5 (day 21), and Aug. 12 (day 28). Control seedlings were kept under natural day lengths, both indoors and outdoors. Total number of seedlings in each treatment =44, n = 4 (each replicate contains 11 seedlings). Data were analyzed independently for the first and second week after starting the SD treatment and different letters therein indicate significant differences among treatments at p ≤ 0.05 according to Tukey’s test. Vertical lines represent the standard error. For the third and fourth week, ANOVA could not be performed due to skewed distribution; only standard error of treatment means was calculated

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