Abstract
The photosynthesis was investigated 30 d after Pb treatment in Myrica rubra seedlings. The Pb treatment resulted in significantly increased Pb concentrations in shoots. Low Pb concentration exposure (≤2 mM) reduced the net photosynthetic rate (PN), transpiration rate (E), and stomatal conductance (gs) without affecting the intercellular CO2 concentration (Ci), chlorophyll (Chl) content, and Chl fluorescence parameters. At 10 d after severe Pb treatment (≥4 mM), PN was inhibited and accompanied by Chl damage, while at 30 d, the inhibition of PN was followed by an increase of Ci and a decrease of gs, E, Chl content, and Chl fluorescence parameters. M. rubra showed a promising prospect for use in the soil phytoremediation, when Pb concentration is low, but the remediation efficiency of M. rubra is limited if Pb exceeds 2 mM.
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Abbreviations
- AOS:
-
activated oxygen species
- Ci:
-
intercellular CO2 concentration
- Chl:
-
chlorophyll
- E :
-
transpiration rate
- F0 :
-
minimal fluorescence of the dark-adapted state
- ΦPSII :
-
effective quantum yield of PSII photochemistry
- Fv/Fm :
-
maximal quantum yield of PSII photochemistry
- gs:
-
stomatal conductance
- P N :
-
net photosynthetic rate
- qN:
-
nonphotochemical quenching coefficient
- qP:
-
photochemical quenching coefficient
- WUE:
-
water-use efficiency
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Acknowledgements: We would like to thank editors for editing and improving the language of the manuscript. We also thank Dr. Reza Hajimorad, University of Tennessee, Knoxville, USA, for linguistic assistance. This research was supported by the National Natural Science Foundations of China (Grant Nos. 30560007, 31060087, 31560122), and the “Soil Pollution and Ecological Remediation” Talent’s Small Highland Project of Guangxi Province.
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He, B., Gu, M., Wang, X. et al. The effects of lead on photosynthetic performance of waxberry seedlings (Myrica rubra). Photosynthetica 56, 1147–1153 (2018). https://doi.org/10.1007/s11099-018-0800-1
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DOI: https://doi.org/10.1007/s11099-018-0800-1