Table 2.

Drought-responsive genes of A. thaliana identified as P. abies homologs and orthologs.

Plant species	Genome	Needles	Roots	Common
		Transcriptome/DE	Transcriptome/DE
Arabidopsis (373 genes)	335 (89.8%)	325/39 (87.1/10.5%)	328/117 (87.9/31.4%)	322/33 (86.3/8.9%)
Norway spruce	979	782/43	826/164	758/24

An overview of the gene numbers in the needle and root transcriptome and in the set of DEGs, respectively, with sequence homology to drought genes in A. thaliana is given. Three hundred and seventy-three Arabidopsis genes with well-characterized roles in drought response were considered. Orthologs or homologs of these genes (indicated in the genome column) were identified in Norway spruce. Identified orthologs/homologs were then classified based on whether they showed conservation of differential expression in response to drought in the needles and roots of Norway spruce seedlings or were commonly DE in both tissues.