LIGNIFICATION AND GROWTH OF Eucalyptus grandis (HILL EX MAIDEN) WITH GA₃ AND BAP

ABSTRACT

In this research experiments were accomplished with two classes of vegetable hormones (gibberellin and cytokinin); with the objective of verifying the effect of gibberellic acid and 6-Benzylaminopurine (GA₃ and BAP) on the lignification and the longitudinal growth in seedlings of Eucalyptus grandis. The experiment was accomplished greenhouse, where were the growth regulators combined or isolated applied, in the following concentrations: GA₃ (49.13 μM e 98.26 μM); BAP (111 μM e 222 μM), with five repetitions for each treatment. The comparisons among the averages of the height of the plants to the 6 months showed that the most pronounced prolongations of the stem corresponded to the treatments G_[2], G_[2]C_[1] and G_[2]C_[2] where the largest concentration of GA₃ was used. In the treatment G_[1]C_[1] where it was combined to smallest concentration of GA₃ with to smallest concentration of BAP (49,13 μM de GA₃ + 111 μM de BAP), it happened the smallest lignin tenor 23,37%.

Keywords:
Eucalyptus grandis; cell wall; lignin; forest biotechnology