Data are expressed as mean values ± SD (n = 4) and have been analyzed by two-way analysis of variance. Mean values followed by the same letter within columns are not
significantly different by Tukey’s test at the 5% level. Total biomass is the sum of the root and leave biomass. Control, As 5 and As 10 refer to As concentrations of 0, 5 and
10 mg L−1, respectively; -T refers to plants non-inoculated with Trichoderma; T22 refers to plants inoculated with Trichoderma harzianum; P1 refers to plants inoculated with
Trichoderma atroviride.