Effects of cadmium on photosynthesis of Schima superba young plant detected by chlorophyll fluorescence
- 169 Downloads
Contamination by heavy metals has become a serious environmental pollution issue today due to its potential threat to plant, wildlife, and human health. Photosynthesis, a process in which light energy is used to produce sugar and other organic compounds, is sensitive to heavy metals. In the present study, the response of photosynthetic process and carbon assimilation of Schima superba was investigated under cadmium (Cd) stress. Three Cd concentrations (0, 300, and 600 mg kg−1) were used designated as control (CK), low Cd (L1), and high Cd treatment (L2) of plants. Results showed that photosystem II (PSII) acceptor and donor side electron transport were more easily blocked in treatment compared to control, and L2 have more significant changes than L1. A substantial decrease of 820 nm reflection curve absorption was observed both in L1 and L2 treatments. Special energy fluxes showed significant difference between the control group and the treated group, which indicated that low concentration Cd stress can cause decrease in quantum yield of PSII in plants studied. Non-stomatal factors resulted in a decrease in net photosynthetic rate and a decrease in photosystem activity. Our results suggested that Cd can damage structure and function of the photosynthesis of S. superba young plants.
KeywordsCadmium PSI PSII CO2 assimilation Chlorophyll fluorescence Schima superba
The authors thank “948” introduction project of The State Bureaucracy of Forestry (2014-4-62) and Nature Science Foundation of Hunan Provincial Innovative Research Team (2013) for the financial support. We are also grateful to the journal of Environmental Science and Pollution Research editor and two anonymous reviewers for their critical reviewing and suggestions of the manuscript.
- Goltsev V, Zaharieva I, Chernev P (2012) Drought-induced modifications of photosynthetic electron transport in intact leaves: Analysis and use of neural networks as a tool for a rapid non-invasive estimation. BBA Biomembranes 1817:1490–1498. https://doi.org/10.1016/j.bbabio.2012.04.018 Google Scholar
- Guisse B, Srivastava A, Strasser RJ (1995) Effects of high temperature and water stress on the polyphasic chlorophyll a fluorescence transient of potato leaves. In: Mathis P (ed) Photosynthesis: from light to biosphere. Kluwer Academic Publishers, Dordrecht, pp 913–916Google Scholar
- Li G, Zhang SP, Liu P, Gao HY, Wang JF, Liu CX, Dong ST, Zhang JW (2011) Effect of Cd on photosystem activities of maize (Zea mays L.) leaves. Sci Agric Sin 44:3118–3126 (in Chinese). https://doi.org/10.3864/j.issn.0578-1752.2011.15.006 Google Scholar
- Nie J, Liu YJ, Zeng GM, Zheng BH, Tan XF, Liu H, Xie JL, Gan C, Liu W (2016) Cd accumulation and tolerance of Macleaya cordata: a newly potential plant for sustainable phytoremediation in Cd-contaminated soil. Environ Sci Pollut Res 23:10189–10199. https://doi.org/10.1007/s11356-016-6263-7 CrossRefGoogle Scholar
- Shikanai T (2007) Cyclic electron transport around photosystem I: genetic approaches. Annu Rev Plant Biol 58:199–217. https://doi.org/10.1146/annurev.arplant.58.091406.110525 CrossRefGoogle Scholar
- Song WE, Chen L, Chen SB, Song NN, Li N, Liu B (2015) Variation of Cd concentration in various rice cultivars and derivation of cadmium toxicity thresholds for paddy soil by species-sensitivity distribution. J Int Agric 14:1845–1854. https://doi.org/10.1016/S2095-3119(14)60926-6 CrossRefGoogle Scholar
- Strasser RJ, Srivastava A, Govindjee (1995) Polyphasic chlorophyll a fluorescence transient in plants and cyanobacteria. Photochem Photobiol 61:32–42. https://doi.org/10.1111/j.1751-1097.1995.tb09240.x CrossRefGoogle Scholar
- Strasser RJ, Tsimilli-michael M, Sheng Q, Goltsev V (2010) Simultaneous in vivo recording of prompt and delayed fluorescence and 820-nm reflection changes during drying and after rehydration of the resurrection plant Haberlea rhodopensis. BBA Biomembranes 1797:1313–1326. https://doi.org/10.1016/j.bbabio.2010.03.008 Google Scholar
- Yan K, Zhao SJ, Xu HL, Wu CW, Chen XB (2015) Effects of salt stress on photosynthetic characters in honeysuckle with different ploidies. Sci Agric Sin 48:3275–3286 (in Chinese). https://doi.org/10.3864/j.issn.0578-1752.2015.16.017 Google Scholar
- Yusuf MA, Kumar D, Rajwanshi R, Strasser RJ, Tsimilli-Michae M (2010) Overexpression of gamma-tocopherol methyl transferase gene in transgenic Brassica juncea plants alleviates abiotic stress: physiological and chlorophyll a fluorescence measurements. BBA Biomembranes 1797:1428. https://doi.org/10.1016/j.bbabio.2010.02.002 Google Scholar