Document Type : Original Article

Authors

1 Assistant professor, Research institute of forests and Rangelands, agricultural research, education and extension organization (AREEO), Tehran, Iran

2 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran

10.30495/rkctc.2022.67084.1041

Abstract

Background and aim: This study was performed to identify the anatomical responses of lemon balm to selenium nanoparticles (nSe).
Methods: This experimental laboratory study was done at the concentrations of 10 and 50 mg/L of nSe.
Results: Plants were treated with nano-selenium (nSe; 0, 10 and 50 mg/l) and bulk selenium (BSe). The results of this study indicated that nano selenium had a positive and beneficial effect at a concentration of 10, but a concentration of 50 induced toxicity. The microscopic assessment of stem cross-sections showed that the diameter of the central cylinder was increased compared to the control. The highest increase was related to the seedlings exposed to the 50 and 10 mg/l. Stem thickness and diameter in the nSe-treated seedlings at 50 mg/l and bulk at 10 mg/l were increased compared to the control. Xylem diameter decreased in response to the supplements, the lowest belongs to the nSe50. Monitoring the leaf cross-sections showed that nSe10 increased the thickness of xylem diameter, palisade, and sponge parenchyma compared to the control. A comparison of petiole cross-sections indicated that the thickness of the epidermis and the diameter of the central and lateral xylem were changed. While 50 mg/l nSe declined these traits.
Conclusion: Therefore, the results of this study indicate that the application of applied concentration-dependent selenium, in addition to inducing physiological and molecular changes, causes anatomical changes and tissue differentiation. Further research is needed in the future to determine the mechanism of these responses.

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Main Subjects

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