Table 2.

Mycorrhizal colonisation (% of root tips) of Douglas fir (Pseudotsuga menziesii) variety menziesii (DFM) and variety glauca (DFG)

	DFM	DFG
Non-inoculated	8.0 ± 0.8b	0.7 ± 0.5a
Rhizopogon	31.7 ± 4.5d	8.0 ± 2.2b
Non-inoculated + Mn	6.3 ± 2.6ab	3.0 ± 1.4ab
Rhizopogon + Mn	16.0 ± 5.4c	6.7 ± 1.7ab

Plants were cultured in the absence or presence of R. subareolatus for 10 months. Inoculated and non-inoculated plants were exposed to 10 mM Mn in the nutrient solution once week during 5 months. The whole root system of n = 3 plant per treatments was analysed. Different letters indicate significant differences at P ≤ 0.05.