Fig. 4From: Overlapping toxic effect of long term thallium exposure on white mustard (Sinapis alba L.) photosynthetic activityChlorophyll a fluorescence imaging of S. alba leaves from control and Tl-treated plants. Pictures present (from left to right): leaf morphology, minimal (F0) and maximal (FM) chlorophyll fluorescence distribution and calculated FV/FM value of control (a) and Tl-treated plants (b-e): 100 μg L−1 (b); 500 μg L−1 healthy (c), and affected (d) leaves; 1,000 μg L−1 (e). The images are representative for at least ten leaves from each treatment. Bar = 1 cmBack to article page