Figure 3.

Distribution of potassium in Pinus pinaster shoots and roots colonized with HcTOK1-overexpressing fungal lines.

Distribution of K⁺ contents in Pinus pinaster seedlings non-inoculated (NM) or inoculated with Hebeloma cylindrosporum, after 2 months of in vitro culture in K⁺ starvation conditions (0.05 mM). Mycorrhizal plants were inoculated with h7 and CT controls and the two HcTOK1-OE lines. In low K⁺ conditions, plants inoculated with H. cylindrosporum displayed a greater K⁺ content, particularly in roots. Overexpression of HcTOK1 channel enhanced the transfer of K⁺ to the shoot. *Significant difference compared to NM controls (Wilcoxon-Mann-Whitney test; p < 0.05). n = 5–6.