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| Fluorescent Characteristics of Chlorophylls in Plagiomnium acutum Under Cd and Pb Stresses |
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| KeyWord:Plagiomnium acutum（Lindb.）T. Kop; Cd; Pb; chlorophyll fluorescent characters |
| Author Name | Affiliation | | LI Zhao-yang | College of Biology and Environmental Science, Jishou University, Jishou 416000, Hunan, China
Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou 416000, Hunan, China | | WU Hao | College of Biology and Environmental Science, Jishou University, Jishou 416000, Hunan, China | | TIAN Xiang-rong | College of Biology and Environmental Science, Jishou University, Jishou 416000, Hunan, China
Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou 416000, Hunan, China | | LI Jing | College of Biology and Environmental Science, Jishou University, Jishou 416000, Hunan, China
Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou 416000, Hunan, China | | ZHOU Xi | College of Biology and Environmental Science, Jishou University, Jishou 416000, Hunan, China | | DU Xiao-meng | Laboratory of Plant Resources Conservation and Utilization, College of Hunan Province, Jishou 416000, Hunan, China |
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| Abstract: |
| Plant chlorophyll fluorescence is sensitive to the environmental stresses. In this study, we studied the effects of Cd and Pb alone or in combination on chlorophyll fluorescence and cell membrane permeability of Plagiomnium acutum（Lindb.）T. Kop exposed to varied Cd（0, 1, 5, 10 mg·L-1） and Pb（0, 10, 25, 50 mg·L-1） concentrations for 1, 2, 4, 7 and 10 days in hydropnic conditions. High dose and long-time stresses of Cd and Pb caused obvious decreases in maximal photochemical efficiency of PSII（Fv/Fm）, ratios of variable fluorescence to initial fluorescence（Fv/Fo）, effective photochemical efficiency of PSII（Fv′/Fm′）, acyclic electron transfer rate（ETR） and photochemical quantum efficiency[Y（Ⅱ）]. In all treatments under 10 days exposure, quantum yield of non-regulated energy dissipation Y（NO） was continuously increased. Coefficients of nonphotochemical quenching（qN） reached a peak at day 2, whereas those of photochemical quenching（qP） showed a slight decrease from day 1 to day 4 and then a slight increase from day 4 to day 10. At low concentrations, values of Fv/Fm, Fv/Fo and Fv′/Fm′ had a transient increase at day 1. Additionally, different responses of P. acutum to Pb and Cd were observed during the early period of the treatments. All parameters of chlorophyll fluorescence showed an obvious decrease for Pb at day 1, while for Cd at day 4. The solution conductivity started to increase from day 6 and then reached a peak at day 9. In conclusion, Pb and Cd treatments can dramatically alter chlorophyll fluorescence and the values of Fv/Fo can be used to predict Pb and Cd toxicity to P. acutum. |
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