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

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Photosynthetica

Abstract

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.

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Abbreviations

Chl:

chlorophyll

ETRPSI :

electron transport rate of PSI

ETRPSII :

electron transport rate of PSII

Fs :

steady-state fluorescence yield

Fm :

maximal fluorescence yield

Fv/Fm :

maximal PSII quantum yield

HMs:

heavy metals

OEC:

oxygen evolving complex

Pm :

maximal P700 change

QA :

primary electron acceptor of PSII

qN :

coefficient of nonphotochemical quenching

qP :

coefficient of photochemical quenching

RC:

reaction center

ROS:

reactive oxygen species

SP:

saturation pulse

ΦPSII :

effective PSII quantum yield

YPSI :

photochemical quantum yield of PSI

YND :

nonphotochemical quantum yield of PSI

YNO :

quantum yields of nonregulated energy dissipation of PSII

YNPQ :

quantum yields of regulated energy dissipation of PSII

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Authors and Affiliations

  1. Department of Plant Sciences, University of Hyderabad, Hyderabad, 500046, India

    A. Kumar & M. N. V. Prasad

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  1. A. Kumar
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  2. M. N. V. Prasad
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Correspondence to M. N. V. Prasad.

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Acknowledgements: A. Kumar is gratefully acknowledged to University of Hyderabad Research Scholarship through the University Grant Commission, New Delhi.

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

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  • DOI: https://doi.org/10.1007/s11099-015-0091-8

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