Photosynthetica 2023, 61(2):157-167 | DOI: 10.32615/ps.2022.042

Changes in ultrastructure, photosynthetic abilities, and secondary metabolite due to individual and interactive effects of chromium and ultraviolet-B radiation in Adhatoda vasica

A. PANDEY, D. JAISWAL, M. AGRAWAL, S.B. AGRAWAL
Laboratory of Air Pollution and Global Climate Change, Department of Botany, Institute of Science, Banaras Hindu University, 221005 Varanasi, India

The study was executed to assess individual and interactive effects of elevated ultraviolet-B (eUV-B) radiation and chromium (Cr) on a medicinal plant Adhatoda vasica Nees. The experiment was conducted under field conditions involving control, Cr, eUV-B, and Cr+eUV-B treatments. The results showed that Cr content was the highest in roots as compared to other parts under Cr+eUV-B. Significant reductions in photosynthetic rate, intercellular CO2 concentration, and stomatal conductance were observed under all treatments with maximum under Cr+eUV-B. Chlorophyll (Chl) fluorescence parameters showed variable responses under Cr and Cr+eUV-B. Chl content showed reductions under all treatments whereas Chl a/b ratio and carotenoids showed increment under eUV-B and reductions under Cr and Cr+eUV-B. The ultrastructure of leaves showed changes in chloroplasts under treatments. Vasicine (medicinally important secondary metabolite) increased under treatments. Our study revealed that A. vasica showed variable responses towards individual and interactive stress of Cr and eUV-B.

Additional key words: bioconcentration factor; dry mass; physiology; translocation factor; UV-B absorbing compounds.

Received: July 12, 2022; Revised: August 23, 2022; Accepted: August 31, 2022; Prepublished online: October 3, 2022; Published: June 6, 2023  Show citation

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PANDEY, A., JAISWAL, D., AGRAWAL, M., & AGRAWAL, S.B. (2023). Changes in ultrastructure, photosynthetic abilities, and secondary metabolite due to individual and interactive effects of chromium and ultraviolet-B radiation in Adhatoda vasica. Photosynthetica, 61(SPECIAL ISSUE 2023/1), 157-167. doi: 10.32615/ps.2022.042
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