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Effect of Paenibacillus sp. inoculation on P. tremula microshoots in vitro after 2-month incubation. On average lateral root number (a) and density (b) increased by 44.7% and 66% respectively, fresh root biomass (c) increased by 101.9% and dry root biomass (d) by 63.6% (average from 30 explants ± SD, **—p ≤ 0.01, ***—p ≤ 0.001, ****—p ≤ 0.0001).
