Abstract
Plant growth and photosynthetic activity are usually inhibited due to the overall action of Cd on a whole organism, though few cadmium cations can invade chloroplasts in vivo. We found that in vivo, the major portion of Cd in barley chloroplasts is located in the thylakoids (80%), and the minor portion is in the stroma (20%). Therefore, the electron-transport chain in the thylakoids would be the likely target for direct Cd action in vivo. In vitro, we found the distribution of Cd to be shifted to the stroma (40–60%). In barley chloroplasts, the major portions of Mg, Fe, Mn, and Cu were found to be located in the thylakoids, and most Ca, Zn, and K in the stroma. This finding was true for both control and Cu- or Fe-treated plants. Treatment with Cd affected the contents of all cations, and the largest portions of Ca and Zn were in the thylakoids. Alterations of the K and Mn contents were caused by Cd, Cu, or Fe treatment; the levels of other cations in chloroplasts were changed specifically by Cd treatment. The quantity of Cd in chloroplasts was small in comparison to that of Mg, Ca, and Fe. In thylakoids, the amount of Cd was similar to that of Cu and comparable to the levels of Zn and Mn. Accordingly, the possible targets for direct Cd action in thylakoids are the Mn cluster, plastocyanin, carbonic anhydrase, or FtsH protease. The quantity of Cd in thylakoids is sufficient to replace a cation nearly completely at one of these sites or partially (20–30%) at many of these sites.
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Abbreviations
- EDTA:
-
Ethylenediaminetetraacetic acid
- Fo′:
-
Minimal Chl fluorescence in light
- Fm′:
-
Maximal Chl fluorescence in light
- Fs:
-
Steady-state Chl fluorescence
- HM:
-
Heavy metal
- Me:
-
Metal
- NADP+ :
-
Nicotinamide adenine dinucleotide phosphate, oxidized form
- OEC:
-
Oxygen evolving complex of PSII
- Pc:
-
Plastocyanin
- Pm′:
-
Maximal amplitude of P700 change in light
- PPO:
-
Polyphenol oxidase
- PSI:
-
Photosystem I
- PSII:
-
Photosystem II
- SD:
-
Standard deviation
- SE:
-
Standard error
- SOD:
-
Superoxide dismutase
- WT:
-
Wild type (not mutant)
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The work was supported by Grant No. 14-14-00584 from the Russian Science Foundation.
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Lysenko, E.A., Klaus, A.A., Kartashov, A.V. et al. Distribution of Cd and other cations between the stroma and thylakoids: a quantitative approach to the search for Cd targets in chloroplasts. Photosynth Res 139, 337–358 (2019). https://doi.org/10.1007/s11120-018-0528-6
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DOI: https://doi.org/10.1007/s11120-018-0528-6