Abstract
Investigations were carried to unravel mechanism(s) for higher tolerance of floating over submerged leaves of long leaf pondweed (Potamogeton nodosus Poir) against photoinhibition. Chloroplasts from floating leaves showed ~5- and ~6.4-fold higher Photosystem (PS) I (reduced dichlorophenol-indophenol → methyl viologen → O2) and PS II (H2O → parabenzoquine) activities over those from submerged leaves. The saturating rate (V max) of PS II activity of chloroplasts from floating and submerged leaves reached at ~600 and ~230 µmol photons m−2 s−1, respectively. Photosynthetic electron transport rate in floating leaves was over 5-fold higher than in submerged leaves. Further, floating leaves, as compared to submerged leaves, showed higher F v/F m (variable to maximum chlorophyll fluorescence, a reflection of PS II efficiency), as well as a higher potential to withstand photoinhibitory damage by high light (1,200 µmol photons m−2 s−1). Cells of floating leaves had not only higher mitochondria to chloroplast ratio, but also showed many mitochondria in close vicinity of chloroplasts. Electron transport (NADH → O2; succinate → O2) in isolated mitochondria of floating leaves was sensitive to both cyanide (CN−) and salicylhydroxamic acid (SHAM), whereas those in submerged leaves were sensitive to CN−, but virtually insensitive to SHAM, revealing the presence of alternative oxidase in mitochondria of floating, but not of submerged, leaves. Further, the potential of floating leaves to withstand photoinhibitory damage was significantly reduced in the presence of CN− and SHAM, individually and in combination. Our experimental results establish that floating leaves possess better photosynthetic efficiency and capacity to withstand photoinhibition compared to submerged leaves; and mitochondria play a pivotal role in protecting photosynthetic machinery of floating leaves against photoinhibition, most likely by oxidation of NAD(P)H and reduction of O2.
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Abbreviations
- Chl:
-
Chlorophyll
- CN:
-
Cyanide
- DCMU:
-
3-(3,4-Dichlorophenyl)-1,1-Dimethylurea
- DCPIP:
-
Dichlorophenol indophenol
- ETR:
-
Electron transport rate
- F m :
-
Maximum chlorophyll a fluorescence
- F o :
-
Initial (minimum) chlorophyll a fluorescence
- F v :
-
Variable (F m–F o) chlorophyll a fluorescence
- MV:
-
Methyl viologen
- NAD(P)+ :
-
Oxidized nicotinamide adenine dinucleotide (phosphate)
- NAD(P)H:
-
Reduced nicotinamide adenine dinucleotide (phosphate)
- pBQ:
-
Parabenzoquinone
- PFD:
-
Photon flux density
- PQ:
-
Plastoquinone
- PS I, PS II:
-
Photosystem I, Photosystem II
- Q A :
-
Oxidized primary plastoquinone electron acceptor of PS II
- \(Q_{A^-}\) :
-
Reduced primary plastoquinone electron acceptor of PS II
- SHAM:
-
Salicylhydroxamic acid
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Acknowledgments
This work was supported by funds from the Swiss Agency for Development and Cooperation, Government of Switzerland and the Department of Biotechnology (Government of India) under the Indo-Swiss Collaboration in Biotechnology; and the Department of Biotechnology (Government of India) under Bio-CARe Women Scientist Scheme. NS is thankful to the University Grants Commission (of India) for providing her a fellowship. Govindjee is thankful to Ravenshaw University for a visiting professorship (January 5–March 5, 2014) in the Department of Botany; it was during this period the final draft of this paper was written. We also acknowledge the help received from Electron Microscope facility, All India Institute of Medical Sciences (New Delhi) for the ultrastructural studies. We are thankful to Prof. K.S. Rao, Department of Botany, University of Delhi, for the use of LICOR 6400.
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Shabnam, N., Sharmila, P., Sharma, A. et al. Mitochondrial electron transport protects floating leaves of long leaf pondweed (Potamogeton nodosus Poir) against photoinhibition: comparison with submerged leaves. Photosynth Res 125, 305–319 (2015). https://doi.org/10.1007/s11120-014-0051-3
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DOI: https://doi.org/10.1007/s11120-014-0051-3