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Proceedings of the International Academy of Ecology and Environmental Sciences, 2023, 13(4): 148-157
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Article

Photosynthetic chlorophyll fluorescence response of Tradescantia pallida exposed to different heavy metals alone and in combination

Neelima Meravi1, Chandralekha Piparia1, Anjali Verma1, Prashant Kumar Singh2, Santosh Kumar Prajapati1
1Department of Botany, School of Life Sciences, Guru GhasidasVishwavidyalaya, Koni, Bilaspur, 495009, Chhattisgarh, India
2Department of Botany, Govt. VBSD Girls College, Jashpur, 496331, Chhattisgarh, India

Received 55 April 2023;Accepted 10 May 2023;Published online 25 May 2023;Published 1 December 2023
IAEES

Abstract
Presence of metals in the environment may have adverse impacts on the essential components of ecosystem particularly the phototrophs, In order to assess impacts of heavy metals on Tradescantia pallida, plants were grown in pots (5 L capacity) under control and the metal treatment of MnCl2 (10 mM L-1), CuCl2 (10 mM L-1), CoCl2 (10 mM L-1), FeCl3 (10 mM L-1), NiCl2 (10 mM L-1), ZnCl2 (10 mM L-1) and 10 mM combinations of MnCl2 + CoCl2 , CuCl2 + FeCl3 and NiCl2 + ZnCl2. Results showed that the Fv/Fm (indication of the maximum and effective photochemical quantum yield of PS II) was ¡Ý0.70 for the control (0.773) and Mn (0.705), Fe (0.700), and Cu + Fe (0.709) exhibiting small impact of these metals or combination on the photosynthetic machinery. However, the Fv/Fm value <.70 for Cu (0.645), Co (0.116), Ni (0.440), Zn (0.553), Co + Mn (0.363), and Ni + Zn (0.617) treatments clearly showed adverse impact of these metals and combination on the photosynthetic processes. The greatest negative impact observed by Co treatment alone or with the combination of Mn (Co + Mn). The study highlighted reduced negative impact of Cu metals when used in combination with Fe. However, it is clear from the present study that Tradescantia pallida plants are under stress in the presence of heavy metals. It also confirms that presence of heavy metals in ecosystem can cause reduction in the overall primary productivity of the Tradescantia pallida.

Keywords heavy metals;phototrophs;Fv/Fm;Tradescantia pallida.


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