Physiological and ultrastructural effects of lead on tobacco
2012
Alkhatib, R., New Mexico State Univ., Las Cruces (USA). Electron Microscopy Lab. and Molecular Biology Program | Maruthavanan, J., New Mexico State Univ., Las Cruces (USA). Entomology, Plant Pathology and Weed Science Dept. | Ghoshroy, S., University of South Carolina, Columbia (USA). Electron Microscopy | Steiner, R., New Mexico State Univ., Las Cruces (USA). Dept. of Statistics | Sterling, T., Montana State Univ., Bozeman (USA). Dept. of Land Resources and Environmental Sciences | Creamer, R., New Mexico State Univ., Las Cruces (USA). Electron Microscopy Lab. and Molecular Biology Program
The effects of lead toxicity on leaf gas exchange, chlorophyll content, chlorophyll fluorescence, chloroplast ultrastructure, and opening of stomata were examined in tobacco plants. Plants were grown in a growth chamber for 7 d in Hoagland nutrient solution supplemented with 0.0 (control), 5, 10, 25, 50, 100, 300 and 500 microM Pb(NO3)2. Plants treated with 5, 10, and 25 microM Pb(NO3)2 exhibited no abnormalities. Root and shoot growth, net photosynthetic rate and stomatal conductance were significantly reduced in plants treated with 100, 300 and 500 microM Pb(NO3)2. In plants treated with 500 microM Pb(NO3)2, the majority of stomata were closed. The effect of Pb(NO3)2 on chlorophyll content and chlorophyll fluorescence parameters was negligible. However, in plants exposed to 100, 300, and 500 microM Pb(NO3)2, the mesophyll cells showed altered chloroplasts with disrupted thylakoid membranes.
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