Physiological responses,tolerance efficiency,and phytoextraction potential of Hylotelephium spectabile (Boreau) H. Ohba under Cd stress in hydroponic condition |
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Authors: | Cong Zhou Zhaohui Guo Chi Peng Peng Zeng Ataa Fosua Bridget |
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Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha, China;2. School of Metallurgy and Environment, Central South University, Changsha, China https://orcid.org/0000-0002-0916-455X;3. School of Metallurgy and Environment, Central South University, Changsha, China https://orcid.org/0000-0003-3332-184X;4. School of Metallurgy and Environment, Central South University, Changsha, China https://orcid.org/0000-0002-6000-544X |
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Abstract: | Abstract A sand hydroponic experiment with different concentrations of 0, 5, 10, 20, 40?mg L?1 Cd was used to study the growth and physiological response of Hylotelephium spectabile (Boreau) H. Ohba. and its phytoextraction potential for Cd. The results showed that total plant biomass under 5?mg L?1 Cd treatment was slightly affected. The content of malondialdehyde (MDA) in leaf exposed to Cd was higher, and the POD and CAT activity exhibited a positive response to the low level of Cd addition (5?mg·L?1). The photosynthesis pigments were slightly inhibited, and the ultrastructure of chloroplast remained intact after treatment with 10?mg L?1 Cd. The maximum leaf Cd content (603?mg·kg?1) was found in 5?mg L?1 Cd treatment, then decreased with the Cd level increased. The maximum Cd content in the shoots far exceeds the threshold level (100?mg kg?1) for a Cd-hyperaccumulator plant with the value of translocation factor (TFshoot/root) for Cd reaching up to 5.62. In conclusion, H. spectabile showed normal growth and physiological response and high shoot Cd accumulation under 5?mg L?1 Cd stress, which made it to be a good candidate for phytoextraction of low-level Cd polluted environment. |
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Keywords: | Cadmium chloroplast ultrastructure Hylotelephium spectabile (Boreau) H. Ohba tolerance uptake |
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