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| Effects of salinity-inducted organic acid variation on Cd accumulation and salinity tolerance of edible amaranth |
| Received:December 23, 2015 |
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| KeyWord:salt stress;amaranth;organic acid;Cd accumulation;salinity tolerance |
| Author Name | Affiliation | E-mail | | HU Ni | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China | | | CHEN Ke-han | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China | | | LI Qu-sheng | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China | liqusheng@21cn.com | | XU Zhi-min | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China
College of Life Science and Technology, Jinan University, Guangzhou 510632, China | | | GUO Shi-hong | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China
College of Life Science and Technology, Jinan University, Guangzhou 510632, China | | | YU Dan-ping | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China | | | LUO Tao | School of Environment, Jinan University, Key Laboratory of Environmental Exposure and Health of Guangzhou City, Guangzhou 510632, China
Guangdong Provincial Research Center of Environmental Pollution Control and Remediation Material, Guangzhou 510632, China | |
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| Abstract: |
| Soil Cd pollution and soil salinization have severely threatened agricultural development and human health. It is important to study Cd accumulation and salinity tolerance of vegetables. Here a pot experiment was conducted to examine the influence of organic acid metabolism on Cd accumulation and salinity tolerance of two amaranth cultivars(Quanhong and Liuye) under 0.3% NaCl stress. Results showed that:Under salinity stress, the content of Cd in roots, shoots, and rhizospheric soil solution and the translocation ratios(from roots to shoots) of Cd in two cultivars increased compared with the control. Cadmium concentrations in Quanhong were obviously lower than those in Liuye. In addition, the content of Na+ was significantly increased but K+ absorption was obviously inhibited by salt stress; Under salinity stress, various organic acids were detected in roots, shoots and rhizospheric soil solution. Malic acid and oxalic acid were significantly increased, which were significantly positively correlated with Cd content in rhizospheric soil solution(P<0.05). In Liuye, the content of oxalic acid in shoots and acetic acid in roots was significantly increased, and were significantly positively correlated with the correspondling Cd content(P<0.05). These results suggest that Quanhong has lower Cd accumulation, stronger salinity tolerance, which was attributed to the variations of organic acids in the plants. |
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