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Levels of Tl (Thallium) in soil from 0 (control) to 50 μg/L through 0.2, 0.5, 1 and 2.5 μg/L were directly and positively correlated to levels of Tl in plant tissue, the accumulation being maximum in roots, intermediate in leaves and minimum in stems. Thallium, especially at higher concentrations, adversely affected photosynthesis (as judged based on chlorophyll fluorescence parameters), suggesting inhibition of photo-activation of PSII (Photosystems II), and also decreased the rate of photosynthesis, the rate of transpiration and stomatal conductivity drastically. Exposure to Tl also increased the activity of CAT (Catalase) (except at 1 μg/L) and POD (Peroxidase) (except at 0.2 μg/L), suggesting that the antioxidant systems in Coix lacryma-jobi were the main contributors of CAT and SOD (Superoxide Dismutase) and that the tolerance of C. lacryma-jobi to Tl is mainly due to this induced antioxidant machinery.

Effects of Thallium Stress on Photosynthesis, Chlorophyll Fluorescence Parameters and Antioxidant Enzymes Activities of Coix Lacryma-jobi