Abstract
The cadmium (Cd), being a widespread soils pollutant and one of the most toxic heavy metals in the environment, adversely affects sustainable crop production and food safety. Pot experiment was conducted to quantify and simulate the response of purslane (Portulaca oleracea L.) plants to Cd toxicity. The purslane germinated seeds were cultivated in twelve Cd concentrations (from 0 to 300 mg/kg of Cd in soil) for six weeks and then some growth characteristics, photosynthesis pigments, and chlorophyll a fluorescence parameters were measured. The influence of Cd gradients in the soil on all growth parameters, photosynthesis pigments and chlorophyll a fluorescence parameters (except F m and carotenoid content) were described by a segmented model. Furthermore, F m and carotenoid contents were fitted to a linear model. The growth characteristics, chlorophyll content, photosynthetic pigments and some parameters of chlorophyll a fluorescence such as F v, F v/F m, Y(II) and ETR decreased when Cd concentration increased. In contrast, F 0, Y(NPQ) and Y(NO) increased and F m was not significantly affected. In general, most variations in the studied parameters were recorded with low concentrations of cadmium, which ranged from 0 to 125 mg/kg. Also, the growth characteristics (especially stem, leaf, and shoot dry weights) were more sensitive to Cd contamination than other parameters. Moreover, among chlorophyll fluorescence parameters, Y(NPQ) was the most sensitive to Cd concentration gradients in the soil that can be due to disturbances of antennae complex of PSII.
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Abbreviations
- ETR:
-
electron transport rate
- F 0 :
-
minimum fluorescence of dark sample
- F m :
-
maximum fluorescence of dark sample
- F v :
-
variable fluorescence
- F v/F m :
-
maximum photochemical quantum yield of PSII
- F ’0 :
-
minimum fluorescence of illuminated sample
- F ’m :
-
maximum fluorescence of illuminated sample
- F t :
-
steady state fluorescence
- Y(II):
-
effective photochemical quantum yield of PSII
- Y(NPQ):
-
quantum yield of regulated energy dissipation
- Y(NO):
-
quantum yield of non-regulated energy dissipation
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Yaghoubian, Y., Siadat, S.A., Moradi Telavat, M.R. et al. Quantify the response of purslane plant growth, photosynthesis pigments and photosystem II photochemistry to cadmium concentration gradients in the soil. Russ J Plant Physiol 63, 77–84 (2016). https://doi.org/10.1134/S1021443716010180
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DOI: https://doi.org/10.1134/S1021443716010180