Table 2. The relative expression of Bp4CL1 and Bp4CL2 genes in silver birch (Betula pendula) stems and leaves.

Gene		Stems				Leaves
	Clone/Line	Atub		PP2A		Atub		PP2A
Bp4CL1	A	1.27±0.21	ad	1.28±0.24	a	1.77±1.17	a	1.91±1.45	a
	A1	0.85±0.25	*	0.48±0.15	***	1.27±0.94		0.94±0.66	*
	A5	1.28±0.18		0.78±0.4	*	1.79±1.29		0.90±0.69	*
	E5382	0.52±0.05	bc	0.38±0.22	b	1.92±0.91	ab	0.63±0.40	b
	E5382/3	0.49±0.15		0.25±0.15		0.92±0.49		0.96±0.34
	E5396	0.63±0.05	b	0.31±0.06	b	1.79±1.93	b	0.67±0.54	b
	E5396/4	0.82±0.15	*	0.31±0.11		1.48±1.14		0.64±0.38
	R	1.82±0.15	cd	0.56±0.2	b	1.75±1.54	ab	1.14±0.45	ab
Bp4CL2	A	0.88±0.22	a	0.88±0.16	a	2.92±2.85		3.12±3.38	a
	A1	0.85±0.09		0.48±0.08	***	2.25±2.37		2.41±2.18
	A5	1.17±0.54		0.71±0.19		4.22±3.87		2.70±2.17
	E5382	0.40±0.25	ab	0.33±0.28	b	2.34±1.78		0.55±0.29	b
	E5382/3	0.13±0.09		0.06±0.04		0.50±0.31		0.51±0.14
	E5396	0.29±0.09	b	0.14±0.05	b	1.50±1.39		0.33±0.10	b
	E5396/4	1.05±0.57	**	0.37±0.16	*	1.64±1.61		0.72±0.61
	R	1.75±1.54	ab	1.14±0.45	ab	4.09±3.2		3.82±2.75	a

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.