Table 1.

Distribution of stress-induced differential intron retention events in poplar tissues.

Tissue	Treatment		Differential intron retention events
			Unique events	Associated non-redundant loci	Loci associated with multiple DIRs (two or more events per gene)
Leaf	Drought	Short term	195	174	19
		Prolonged	178	170	6
	Salt	Short term	134	112	15
		Prolonged	117	104	11
	Heat	Short term	116	103	11
		Prolonged	110	101	7
	Cold	Short term	117	110	4
		Prolonged	140	130	91
Root	Drought	Short term	172	171	1
		Prolonged	137	123	11
	Salt	Short term	166	165	1
		Prolonged	161	161	9
	Heat	Short term	150	141	8
		Prolonged	167	156	8
	Cold	Short term	213	208	5
		Prolonged	154	152	2
Xylem	Drought	Short term	203	173	20
		Prolonged	218	179	28
	Salt	Short term	249	228	18
		Prolonged	221	172	33
	Heat	Short term	222	196	19
		Prolonged	190	158	23
	Cold	Short term	244	227	15
		Prolonged	313	294	16