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Journal of Plant Growth Regulation

, Volume 34, Issue 1, pp 13–21 | Cite as

Hormesis Effects Induced by Cadmium on Growth and Photosynthetic Performance in a Hyperaccumulator, Lonicera japonica Thunb.

  • Lian Jia
  • Zhouli Liu
  • Wei Chen
  • Yin Ye
  • Shuai Yu
  • Xingyuan He
Article

Abstract

A soil experiment was designed to investigate the hormesis effect of cadmium (Cd) on the growth and the photosynthetic performance in a hyperaccumulator, Lonicera japonica Thunb. by measuring gas exchange, chlorophyll fluorescence parameters, and photosynthetic pigments. After 90 days of exposure to soil containing 25 mg kg−1 Cd, shoot Cd concentrations reached 168.27 ± 5.01 μg g−1 dry weight, without showing symptoms of visible damage to the plants. The results also show that Cd at low concentrations (≤10 mg kg−1) induced a significant increase in plant biomass, net photosynthetic rate (P n), content of chlorophyll (a, b, and a+b) and carotenoids, effective quantum yield ΦPSII and photochemical quenching coefficient q p, but inhibited them at high concentrations (>25 mg kg−1), confirming a hormetic response. The observed growth increases were closely related to the increase in net photosynthesis induced by Cd, though the causes of the P n increase are still not understood. The present study suggested that hormetic effects should be taken into consideration in phytoremediation of Cd-contaminated soil and the dose range of Cd inducing hormesis on L. japonica is proposed as 2.5–10 mg kg−1 in the soil.

Keywords

Cadmium Hormesis Lonicera japonica Thunb. Photosynthesis Growth U-shaped curve 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (41301340), the National Science & Technology Pillar Program (2012BAC05B05) and the major National Science & Technology project “water pollution control and management” (2012ZX07202008) of China.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Lian Jia
    • 1
    • 2
  • Zhouli Liu
    • 1
  • Wei Chen
    • 1
  • Yin Ye
    • 1
  • Shuai Yu
    • 1
  • Xingyuan He
    • 1
  1. 1.State Key Laboratory of Forest and Soil Ecology, Institute of Applied EcologyChinese Academy of SciencesShenyangPeople’s Republic of China
  2. 2.College of Chemistry and Life ScienceAnshan Normal UniversityAnshanPeople’s Republic of China

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