eATP levels measured from culture medium collected from mock treated and S. indica colonized Arabidopsis seedlings at 3, 5, 7 and 10 dpi. Error bars represent ±SE of the mean from three independent biological replicates. RLU: relative light units. Asterisks indicate significance at p< 0.05 (*), 0.01 (**) analyzed by Student's t-test. 