Fig. 7

The transcriptomic activity of needles in EP and LP trees kept indoors and outdoors in mid-winter. a Frequency distribution of highly abundant genes (TPM > 10) in the needles of EPs and LPs. ENw and LNw indicate the needles of EPs and LPs in mid-winter. P-values for significance of differences in the mean (t-test) are given above the bars. *P < 0.05, ** P < 0.01. Error bars indicate the SE of six biological replicates. b Frequency distribution of highly abundant genes (TPM > 10) in needles of trees kept indoors (In) and outdoors (Out) in the mid-winter. The trees were moved indoors for one week before sampling, and maintained in greenhouses under natural light and photoperiod conditions. Temperature was maintained at 8–10 °C during the day and 0–4 °C at night. ***P < 0.001. Error bars indicate SEs of nine biological replicates