Comparative physiological responses of Solanum nigrum and Solanum torvum to cadmium stress

Authors

  • Jin Xu,

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
    2. Hebei Province Engineering Laboratory for Plant Breeding and Germplasm Enhancement of Stress-Tolerant Plants, 286 Huaizhong RD, Shijiazhuang 050021, China
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  • Yiyong Zhu,

    1. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
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  • Qing Ge,

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
    2. Hebei Province Engineering Laboratory for Plant Breeding and Germplasm Enhancement of Stress-Tolerant Plants, 286 Huaizhong RD, Shijiazhuang 050021, China
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  • Yulong Li,

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
    2. Hebei Province Engineering Laboratory for Plant Breeding and Germplasm Enhancement of Stress-Tolerant Plants, 286 Huaizhong RD, Shijiazhuang 050021, China
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  • Jianhang Sun,

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
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  • Yuan Zhang,

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
    2. Hebei Province Engineering Laboratory for Plant Breeding and Germplasm Enhancement of Stress-Tolerant Plants, 286 Huaizhong RD, Shijiazhuang 050021, China
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  • Xiaojing Liu

    1. Key Laboratory of Agricultural Water Resources, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 286 Huaizhong RD, Shijiazhuang 050021, China
    2. Hebei Province Engineering Laboratory for Plant Breeding and Germplasm Enhancement of Stress-Tolerant Plants, 286 Huaizhong RD, Shijiazhuang 050021, China
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Author for correspondence:
Jin Xu
Tel: +86 311 85871745
Email: xujin@sjziam.ac.cn

Summary

  • Under cadmium (Cd) stress, Solanum nigrum accumulated threefold more Cd in its leaves and was tolerant to Cd, whereas its low Cd-accumulating relative, Solanum torvum, suffered reduced growth and marked oxidative damage. However, the physiological mechanisms that are responsible for differential Cd accumulation and tolerance between the two Solanum species are largely unknown.
  • Here, the involvement of antioxidative capacity and the accumulation of organic and amino acids in response to Cd stress in the two Solanum species were assessed.
  • Solanum nigrum contains higher antioxidative capacity than does S. torvum under Cd toxicity. Metabolomics analysis indicated that Cd treatment also markedly increased the production of several organic and amino acids in S. nigrum. Pretreatment with proline and histidine increased Cd accumulation; moreover, pretreatment with citric acid increased Cd accumulation in leaves but decreased Cd accumulation in roots, which indicates that its biosynthesis could be linked to Cd long-distance transport and accumulation in leaves.
  • Our data provide novel metabolite evidence regarding the enhancement of citric acid and amino acid biosynthesis in Cd-treated S. nigrum, support the role of these metabolites in improving Cd tolerance and accumulation, and may help to provide a better understanding of stress adaptation in other Solanum species.

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