Table 3 Biomass (g) of Pinus laricio callus after 28 d of subculture in presence of hormones (2,4-D + BAP) or humic or fulvic acid at A = 0.5 mg.L⁻¹; B = 1.0 mg.L⁻¹; C = 2.0 mg.L⁻¹

Control

2.41 (0.02)^gA

2.41 (0.01)^h A

2.41 (0.02)^m A

2,4-D + BAP

5.08 (0.03)^bA

5.08 (0.01)^bA

5.08 (0.01)^cA

HA-C

4.30 (0.03)^cdAB

4.20 (0.05)^dB

4.50 (0.02)^dA

HA-D

4.21 (0.02)^dA

4.13 (0.05)^dA

4.00 (0.03)^eA

HA-E

6.10 (0.04)^aA

6.15 (0.04)^aA

6.20 (0.05)^aA

HA-F

3.35 (0.01)^efA

3.47 (0.05)^eA

3.11 (0.01)^hB

HA-G

5.12 (0.07)^bB

5.01 (0.04)^bcB

5.55 (0.02)^bA

HA-H

4.90 (0.02)^bA

4.89 (0.06)^bcA

5.01 (0.02)^cA

HA-I

4.89 (0.05)^bA

4.80 (0.02)^cA

4.95 (0.02)^cA

HA-L

3.40 (0.07)^eA

3.20 (0.03)^fBC

3.09 (0.06)^hC

HA-M

3.21 (0.08) ^fA

3.01 (0.04)^gB

2.88 (0.05)ⁱC

HA-N

4.32 (0.02)^cA

3.02 (0.01)^gB

2.67 (0.02)^lC

FA-O

4.34 (0.01)^cA

4.19^c

3.80^f

4.19 (0.02)^dA

3.80 (0.01) ^fBC

FA-P

4.55 (0.03)^cA

4.15 (0.02)^dB

3.50 (0.01)^gC

FA-Q

4.90 (0.03)^bA

2.40 (0.03)^hB

2.41 (0.07) ^mB