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Effect of Paenibacillus sp. inoculation on P. tremula × P. alba microshoots in vitro after 2-month incubation. On average lateral root number (a) and density (b) increased by 213.7% and 125.6% respectively, dry root biomass (c) increased by 144.8%. Adventitious roots were also affected, on average their sum length (d) increased by 102% and the number of adventitious roots (e) increased by 65% (average from 30 explants ± SD, *** p ≤ 0.001, **** p ≤ 0.0001).
