Neelima Meravi Chandralekha Piparia Anjali Verma Prashant Kumar Singh Santosh Kumar Prajapati Department of Botany, School of Life Sciences, Guru GhasidasVishwavidyalaya, Koni, Bilaspur, 495009, Chhattisgarh, India Department of Botany, Govt. VBSD Girls College, Jashpur, 496331, Chhattisgarh, India Proceedings of the International Academy of Ecology and Environmental Sciences ISSN 2220-8860 http://www.iaees.org/publications/journals/piaees/online-version.asp 2023 13 4 148 157 International Academy of Ecology and Environmental Sciences Hong Kong 55 April 2023 10 May 2023 1 December 2023 heavy metals phototrophs Fv/Fm Tradescantia pallida 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 not less than 0.70 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 less than .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. http://www.iaees.org/publications/journals/piaees/articles/2023-13(4)/photosynthetic-chlorophyll-fluorescence-response.pdf