Seven days after inoculation (15 days after sowing), glucose concentration in root exudates (mg ml−1) was 3.14 ± 1.70 in control plants, 3.26 ± 1.72 in plants inoculated with strain FT326, 17.21 ± 2.84 with strain PAC, and 0.55 ± 0.78 with strain CMR165.