Briefly, bacteria-coated seeds or control seeds (coated with methyl cellulose) were sown in tubes (25 × 200 mm) filled with 5g of sterilized vermiculate layer overlaid with 20 g of a natural wheat rhizosphere soil mix (soil: sand, 2:1, v:v) amended with Ggt colonized oat kernels fragments (0.85%, w/w).
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