Photosynthetica 2018, 56(2):678-686 | DOI: 10.1007/s11099-017-0717-0

Zinc oxide nanoparticle-mediated changes in photosynthetic efficiency and antioxidant system of tomato plants

M. Faizan1, A. Faraz1, M. Yusuf1, S. T. Khan2, S. Hayat1,*
1 Plant Physiology and Biochemistry Section, Department of Botany, Aligarh Muslim University, Aligarh, India
2 DNA Research Chair, Zoology Department, College of Science, King Saud University, Riyadh, Saudi Arabia

The present study was carried out to assess the role of zinc oxide nanoparticles (ZnO-NPs) in tomato plants on growth, photosynthetic efficiency, and antioxidant system. At 20-d stage of growth, roots of tomato plants were dipped into 0, 2, 4, 8, or 16 mg(ZnO-NPs) L-1 for 15, 30, and 45 min and then seedlings were transplanted in their respective cups and allowed to grow under natural environmental conditions. At 45-d stage of growth, the ZnO-NPs treatments significantly increased growth, photosynthetic efficiency together with activities of carbonic anhydrase and antioxidant systems in a concentration- and duration-dependent manner. Moreover, the treatment by 8 mg(ZnO-NPs) L-1 for 30 min proved to be the most effective and resulted in maximum activities of antioxidant enzymes, proline accumulation and the photosynthetic rate. We concluded that presence of ZnO-NPs improved the antioxidant systems and speeded up proline accumulation that could provide stability to plants and improved photosynthetic efficiency.

Additional key words: antioxidant enzyme; gas exchange; growth; micronutrient

Received: August 5, 2016; Accepted: December 6, 2016; Published: June 1, 2018  Show citation

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Faizan, M., Faraz, A., Yusuf, M., Khan, S.T., & Hayat, S. (2018). Zinc oxide nanoparticle-mediated changes in photosynthetic efficiency and antioxidant system of tomato plants. Photosynthetica, 56(2), 678-686. doi: 10.1007/s11099-017-0717-0
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