Table 1. The lignin analysis of 2-year-old silver birch stems.

Clone/Line	S/G	Acid soluble lignin %	Klason lignin %	Total lignin %
A clone	3.22±0.47	3.54±0.26	17.22±0.34	20.77±0.51
A1 line	3.97±0.06*	3.83±0.40	17.42±0.54	21.25±0.55
A2 line	2.95±0.19	3.27±0.36	18.21±0.19	21.49±0.39
A5 line	3.51±0.20	3.96±0.76	18.11±1.12	22.08±1.37
E5382 clone	3.61±0.12	3.93±0.54	17.96±0.96	21.89±1.14
E5382/3 line	3.50±0.31	4.00±0.35	18.41±1.13	22.41±0.83
E5396 clone	NA	3.95±0.11	17.1±0.23	22.22±0.39
E5396/4 line	NA	3.74±0.00	14.78±0.96	19.47±1.02

Values represent means ± SD. Star indicates significant differences (P<0.05) between clone and line according to the independent-samples t test, Welch Two Sample t test or Wilcoxon test. Number of replicates 4 expect for the E5396 and E5396/4 which had two biological replicates.