Table 3. The relative expression of Bp4CL3 and Bp4CL4 genes in silver birch (Betula pendula) stems and leaves.

Gene		Stems				Leaves
	Clone/Line	Atub		PP2A		Atub		PP2A
Bp4CL3	A	1.27±0.21	ad	1.28±0.24	a	0.30±0.61	a	0.29±0.67	a
	A1	0.85±0.25	*	0.48±0.15	***	0.38±0.88		0.31±0.60
	A5	1.28±0.18		0.78±0.4	*	0	*	0	*
	E5382	0.52±0.05	bc	0.38±0.22	b	4.88±4.31	bc	0.79±0.24	b
	E5382/3	0.49±0.15		0.25±0.15		1.29±1.88	**	0.97±1.17
	E5396	0.63±0.05	b	0.31±0.06	b	3.10±2.65	bc	0.91±0.70	b
	E5396/4	0.82±0.15	*	0.31±0.11		3.82±2.49		1.97±0.77	**
	R	1.82±0.15	cd	0.56±0.2	b	1.75±1.02	bc	2.30±1.59	c
Bp4CL4	A	0.88±0.22	a	0.88±0.16	a	5.15±3.83	a	6.01±4.00	a
	A1	0.85±0.09		0.48±0.08	***	3.36±2.79	*	2.40±1.44	**
	A5	1.17±0.54		0.71±0.19		2.84±2.40	*	1.40±1.05	***
	E5382	0.4±0.25	ab	0.33±0.28	b	0.43±0.40	b	0.15±0.31	b
	E5382/3	0.13±0.09		0.06±0.04		1.68±0.90	***	1.92±1.09	***
	E5396	0.29±0.09	b	0.14±0.05	b	0.63±0.82	bc	0.23±0.38	b
	E5396/4	1.05±0.57	**	0.37±0.16	*	1.81±1.53	*	0.93±0.51	***
	R	1.75±1.54	ab	1.14±0.45	ab	1.46±0.80	c	1.24±0.88	c

Values represent means and standard deviations calculated using Atub or PP2A gene as reference gene (n = 3–16). Statistical examination of data was performed using the independent-samples t test, Welch Two Sample t test or Wilcoxon test (with Bonferroni correction in the case of clonal differences). Different letters denote significant (P<0.05) difference between the clones. Stars denote significant (*P<0.05, **P<0.01, ***P<0.001) difference between transgenic line to non-transgenic clone.