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| Uptake, Translocation and Subcellular Distribution Characteristics of Cadmium and Sodium in Suaeda salsa and Atriplex triangularis |
| Received:December 04, 2014 |
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| KeyWord:halophyte;cadmium;tolerance;subcellular distribution |
| Author Name | Affiliation | E-mail | | YANG Ya-zhou | College of Resources and Environmental Sciences, Jiangsu Provincial Key Laboratory of Marine Biology, Nanjing Agricultural University, Nanjing 210095, China | | | ZHANG Chun-hua | Demonstration Laboratory of Elements and Life Science Research, Laboratory Centre of Life Science, Nanjing Agricultural University, Nanjing 210095, China | | | ZHENG Qing-song | College of Resources and Environmental Sciences, Jiangsu Provincial Key Laboratory of Marine Biology, Nanjing Agricultural University, Nanjing 210095, China | | | ZHANG Chun-yin | Yancheng Green Garden Saline Soil Agricultural Technology Co., Ltd., Yancheng 224002, China | | | GE Ying | College of Resources and Environmental Sciences, Jiangsu Provincial Key Laboratory of Marine Biology, Nanjing Agricultural University, Nanjing 210095, China | yingge711@njau.edu.cn |
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| Abstract: |
| Tolerance and accumulation of cadmium in halophytic species are important for phytoremediation and food safety of heavy metals contaminated saline soils. A hydroponic experiment was conducted to compare the growth response and the Cd and Na uptake, translocation and subcellular distribution of two halophytic species, Suaeda salsa and Atriplex triangularis, in order to improve the understanding of Cd accumulation and detoxification mechanisms at the subcellular level of these two types of halophytes. Both species showed decrease in root length, plant height and biomass under Cd stress. However, the growth response and Cd toxicity symptoms were quite different between both species, with S. salsa less severely affected by Cd stress than A. triangularis, implying that S. salsa had higher Cd tolerance than A. triangularis did. The capacity of Cd adsorption on root surface of two halophytes was also obviously different. Additionally, S. salsa had higher root Cd accumulation but a lower Cd translocation rate than A. triangularis. Cadmium tolerance was associated with the Cd accumulation in the roots and thus low transport to the shoots. The subcellular distribution of Cd was in order of cell wall fraction >soluble fraction >organelle fraction. The cell wall and soluble fractions were the dominant storage compartments for Cd in the roots, stems and leaves. S. salsa could bind more Cd in the cell wall fractions than A. triangularis. Thus, immobilization of Cd by the cell walls of different organs appeared to be the main Cd detoxification mechanism at the subcellular level. Cadmium stress also influenced the content of Na in shoots and roots of two plants, interfering the normal Na homeostasis at the levels of organs and subcellular fractions. |
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