Effect of As concentration in the irrigation water on the net photosynthesis
rate (mol CO2 m−2 s−1) of lettuce plants (Lactuca sativa L.) inoculated with Trichoderma
harzianum T22 or Trichoderma atroviride P1. Circles, rhombi and triangles
refer to As concentrations of 0, 5 and 10 mg L−1 in the irrigation water, 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. Circles, rhombi and triangles represent mean values at least four different
replicates ± SD (n = 4); those followed by the same letter are not significantly
different by Tukey’s test at the 5% level.