Photosynthetica, 2015 (vol. 53), issue 1

Photosynthetica 2015, 53(1):66-71 | DOI: 10.1007/s11099-015-0091-8

Lead-induced toxicity and interference in chlorophyll fluorescence in Talinum triangulare grown hydroponically

A. Kumar1, M. N. V. Prasad1,*
1 Department of Plant Sciences, University of Hyderabad, Hyderabad, India

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.

Keywords: ceylon spinach; chlorophyll fluorescence; electron transport rate; lead; photosynthesis; photosystems

Received: July 1, 2013; Accepted: August 12, 2014; Published: March 1, 2015Show citation

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Kumar, A., & Prasad, M.N.V. (2015). Lead-induced toxicity and interference in chlorophyll fluorescence in Talinum triangulare grown hydroponically. Photosynthetica, 53(1), 66-71. doi: 10.1007/s11099-015-0091-8.
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