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| Screening low-Cd wheat cultivars characterized with high salinity tolerance for typical sewage irrigation soils |
| Received:September 11, 2017 |
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| KeyWord:cadmium;polluted soils;salinity stress;species sensitive distribution(SSD);wheat cultivars |
| Author Name | Affiliation | E-mail | | MENG Nan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | AN Ping | CSSC Nanjing Lvzhou Environment Protection Co., Ltd, Nanjing 210039, China | | | WANG Meng | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | CHEN Li | Institute of Plant Protection and Environment Protection, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China | | | ZHENG Han | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | CHEN Shi-bao | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | chenshibao@caas.cn |
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| Abstract: |
| High salinity and heavy metal pollution are the main limiting factors of improving grain yield which can affect the grain quality of sewage irrigation field soils. Screening low-metal-uptake crop cultivars characterized with high salt tolerance can be important to safe cultivation in irrigation field soils polluted with heavy metals. In this study, a sewage irrigation field soil polluted by Cd was collected, the soil was artificially salinized with 0.4% NaCl(m/m) solution and incubated for 14 d before use, and then pot experiments were conducted to screen low-Cd-uptake wheat cultivars characterized with high salinity tolerance using the species sensitivity distribution model(SSD). The results indicated that significant difference(P<0.05) was observed for the growth inhibition from salt stress among the 10 wheat cultivars, with obvious growth inhibition observed for the wheat cultivars Zhongmai415 and Zhongyou206. The measured salt tolerance index(STI) values for Zhongmai415 and Zhongyou206 were 0.542 and 0.591, respectively; However, no growth inhibition was observed for Zhongmai996 and Zhongyou9507. The measured salt tolerance index values for the wheat cultivars followed the order:Zhongyou9507 ≈ Zhongmai996 > Lunxuan1690 > Lunxuan987 > Zhongmai1062 > Zhongmai175 > Zhongmai14 > Zhongmai816 > Zhongyou206 > Zhongmai415. Significant differences in bioconcentration factors(BCFs) of Cd by shoots and roots were also observed between wheat cultivars. The BCFs of Cd by shoots ranged from 0.338(Zhongmai996) to 0.970(Zhongyou206). In terms of roots, the BCFs of Cd by roots ranged from 3.01(Zhongmai1062) to 5.71(Zhongmai14). The distribution frequency based on the BCFs of shoots among wheat cultivars followed the order:Zhongmai996 > Lunxuan1690 > Zhongmai415 > Zhongmai1062 > Zhongmai175 > Zhongyou9507 > Zhongmai816 > Zhongmai14 > Lunxuan987 > Zhongyou206. By combing the distribution frequency of bioconcentration factors(1/BCF) and salt tolerance index, Zhongmai996 and Lunxuan1690 were screened as the wheat cultivars characterized with low Cd accumulation and high salt tolerance. These results are of importance for safe utilization of sewage irrigation field soil polluted by Cd. |
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