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Changes in relative specific allocation of carbon (RSA C %) for wood (A, B) or lignin (C, D) in opposite wood (OW) and tension wood (TW) of lower (A, C) and middle (B, D) stems of hybrid poplar grown for 35 d under different treatments. Values are mean ±SE (n=5 for wood and n=3 for lignin analyses). Difference between control and treatments was statistically significant at P <0.05 (**) or P <0.1 (*).
