Abstract
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.
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Abbreviations
- ASH-GSH cycles:
-
glutathione-ascorbate cycle
- CA:
-
carbonic anhydrase
- CAT:
-
catalase
- CeO2-NPs:
-
cerium oxide nanoparticles
- Ci:
-
intercellular CO2 concentration
- DAS:
-
days after sowing
- DDW:
-
double distilled water
- E :
-
transpiration rate
- g s :
-
stomatal conductance
- LSD:
-
least significant difference
- NPs:
-
nanoparticles
- NR:
-
nitrate reductase
- P N :
-
net photosynthetic rate
- POX:
-
peroxidase
- ROS:
-
reactive oxygen species
- SiO2-NPs:
-
silicon oxide nanoparticles
- SOD:
-
superoxide dismutase
- SPAD:
-
soil and plant analysis development
- ZnO-NPs:
-
zinc oxide nanoparticles.
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Faizan, M., Faraz, A., Yusuf, M. et al. Zinc oxide nanoparticle-mediated changes in photosynthetic efficiency and antioxidant system of tomato plants. Photosynthetica 56, 678–686 (2018). https://doi.org/10.1007/s11099-017-0717-0
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DOI: https://doi.org/10.1007/s11099-017-0717-0