Experimental set-up for AsIII treatment
For AsIII treatments, plants were grown on ½ x MS media (Phytotechnology Laboratories, LLC, Lenexa, KS) containing 1.5% Sucrose and 0.8% Phytoblend (Caisson Labs, Smithfield, UT) with pH adjusted to 5.7 in growth chamber. Growth conditions were 24o/22oC day/night temperature and 16h/8h light/dark cycle, with a light intensity of 100-120 µmol/m2/s. For AsIII treatments, 20 µΜ sodium arsenite was added to the ½ x MS media and plants were grown for 21 days. Fresh shoot and root biomass were recorded at harvesting, and the samples were flash-frozen in liquid nitrogen and stored at -80oC until further analysis.