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| Physiological Responses of Oenothera glazioviana to Copper Stress and Its Rational Utilization in Copper Contaminated Soil |
| Received:October 28, 2014 |
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| KeyWord:Oenothera glazioviana;Elsholtzia haichowensis;Sesamum indicum;copper tolerance;physiological response |
| Author Name | Affiliation | E-mail | | HE Yao | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHOU Xi-shi | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | XIA Yan | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | GUO Pan | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Gui-ping | National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agricultural University, Nanjing 210095, China | | | SHEN Zhen-guo | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China
National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095, China | | | CHEN Ya-hua | College of Life Science, Nanjing Agricultural University, Nanjing 210095, China
National Joint Local Engineering Research Center for Rural Land Resources Use and Consolidation, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095, China | yahuachen@njau.edu.cn |
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| Abstract: |
| Growth and physiological characteristics of a copper excluder, Oenothera glazioviana, a copper accumulator, Elsholtzia haichowensis, and a copper sensitive species, Sesamum indicum, treated with 50 μmol Cu·L-1 were studied in solution culture. Root growth, cell membrane permeability, uptake of essential elements, integrity of the root-tip plasma membrane, and contents of chlorophyll, organic acid and substances used for osmotic pressure adjustment were measured. Three days after Cu treatment, the root growth decreased in all three plant species. Additionally, the plasma membrane of S. indicum root-tip was seriously damaged, but membranes remained intact in O. glazioviana and E. haichowensis. Compared with the control without Cu stress, cell membrane permeability increased by 130%, but chlorophyll content decreased by 6.9% in the leaves of S. indicum. However, these physiological characteristics did not change in O. glazioviana and E. haichowensis. Under Cu stress, malic acid contents of three species increased. Copper stress did not affect proline content of O. glazioviana, but increased that of E. haichowensis and S. indicum by 37% and 73%, respectively. Accumulation of Cu was positively correlated with that of Zn, Fe, and Mn, but negatively with that of Ca and K in all three species. Furthermore, no effects of Cu stress on thousand kernel weight, contents of oil and γ-linolenic acid were found in O. glazioviana grown in soil containing total copper≤700 mg·kg-1. The content of Cu in O. glazioviana seeds satisfied the National Food Health Standards of China(GBT 5009.13—2003). Low production cost and high economic returns of O. glazioviana make this plant promising in utilizing Cu-contaminated soils. |
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