caa a22 4500 605480443 CHVBK 20210128100415.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s11099-015-0091-8 doi (NATIONALLICENCE)springer-10.1007/s11099-015-0091-8 Lead-induced toxicity and interference in chlorophyll fluorescence in Talinum triangulare grown hydroponically [Elektronische Daten] [A. Kumar, M. Prasad] We investigated the lead (Pb) effect on chlorophyll (Chl) fluorescence and photosynthetic electron transport system in Talinum triangulare (Jacq.) Willd. Plants were exposed to different concentrations of Pb(NO3)2 (i.e. 0, 0.25, 0.5, 0.75, 1.0, and 1.25 mM) for seven days in hydroponic experiments. Pb-treated leaves exhibited a relative decrease in Chl fluorescence induction curve, which resulted in the decrease of maximal fluorescence yield, maximal quantum yield, and effective quantum yield of PSII, while nonphotochemical quenching, quantum yield of regulated and nonregulated energy dissipation of PSII significantly increased during Pb stress. Furthermore, Pb concentrations also caused a decrease in maximal P700 change, photochemical quantum yield, nonphotochemical quantum yield, and ETR of PSI. We suggested that the changes in these parameters were a manifestation of Pb interference in the electron transport chain in both PSII and PSI. The sensitivity of PSII was greater than that of PSI in T. triangulare leaves. The Institute of Experimental Botany, 2015 ceylon spinach nationallicence chlorophyll fluorescence nationallicence electron transport rate nationallicence lead nationallicence photosynthesis nationallicence photosystems nationallicence Chl : chlorophyll nationallicence ETRPSI : electron transport rate of PSI nationallicence ETRPSII : electron transport rate of PSII nationallicence Fs : steady-state fluorescence yield nationallicence Fm : maximal fluorescence yield nationallicence Fv/Fm : maximal PSII quantum yield nationallicence HMs : heavy metals nationallicence OEC : oxygen evolving complex nationallicence Pm : maximal P700 change nationallicence QA : primary electron acceptor of PSII nationallicence qN : coefficient of nonphotochemical quenching nationallicence qP : coefficient of photochemical quenching nationallicence RC : reaction center nationallicence ROS : reactive oxygen species nationallicence SP : saturation pulse nationallicence ΦPSII : effective PSII quantum yield nationallicence YPSI : photochemical quantum yield of PSI nationallicence YND : nonphotochemical quantum yield of PSI nationallicence YNO : quantum yields of nonregulated energy dissipation of PSII nationallicence YNPQ : quantum yields of regulated energy dissipation of PSII nationallicence Kumar A. Department of Plant Sciences, University of Hyderabad, 500046, Hyderabad, India aut Prasad M. Department of Plant Sciences, University of Hyderabad, 500046, Hyderabad, India aut Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 66-71 0300-3604 53:1<66 2015 53 11099 https://doi.org/10.1007/s11099-015-0091-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11099-015-0091-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumar A. Department of Plant Sciences, University of Hyderabad, 500046, Hyderabad, India aut NATIONALLICENCE 700 1- Prasad M. Department of Plant Sciences, University of Hyderabad, 500046, Hyderabad, India aut NATIONALLICENCE 773 0- Photosynthetica The Institute of Experimental Biology of the Czech Academy of Sciences 53/1(2015-03-01), 66-71 0300-3604 53:1<66 2015 53 11099