Journal of Food, Agriculture and Environment
Effects of cadmium fortified in soil on carbon metabolism, nitrogen accumulation and grain yield in maize (Zea mays L.)
Author(s):
Fuqing Sui,
Wei Gao, Peng Zhao *, Fan Yang, Suqing Yang, Qiaoyan Wang, Daizhang WangRecieved Date: 2013-06-30, Accepted Date: 2013-09-28
Abstract:Cadmium (Cd) is a toxic environmental contaminant that has been classified as a human carcinogen, and the area of contaminated farmland continuously expands. This study aims at studying the effects of Cd fortified in the soil on maize carbon and nitrogen in at different stages. A pot experiment with five Cd concentrations (0, 1, 4, 8 and 16 mg/kg) in soil was conducted. The major results can be concluded as follows: (1) High Cd doses (8 and 16 mg/kg) significantly decreased the concentrations of chlorophyll in leaves and nitrogen in stems, and increased the soluble sugar content in leaves and stems. Furthermore, the effects were enhanced with the increase of Cd dose and exposure time. (2) High Cd dose (8 and 16 mg/kg) can inhibit, or even reverse the transfer of soluble sugar and nitrogen from stems to seeds, which probably resulted in the decrease of yield and starch accumulation in the seeds. (3) The threshold value research suggested that maize is capable of absorbing Cd easily from the soil. When the Cd concentration was 1 mg/kg, the seeds cannot be used as food; when the Cd concentration was higher than 8 mg/kg, the straws cannot be used as the feed.
Keywords:Cd,
maize, carbon/nitrogen metabolism, heavy metalJournal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 2436-2440
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