Volume 39 Issue 10
Oct.  2020
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Tiantian Zhang, Minheng Hong, Mingjiang Wu, Binbin Chen, Zengling Ma. Oxidative stress responses to cadmium in the seedlings of a commercial seaweed Sargassum fusiforme[J]. Acta Oceanologica Sinica, 2020, 39(10): 147-154. doi: 10.1007/s13131-020-1630-0
Citation: Tiantian Zhang, Minheng Hong, Mingjiang Wu, Binbin Chen, Zengling Ma. Oxidative stress responses to cadmium in the seedlings of a commercial seaweed Sargassum fusiforme[J]. Acta Oceanologica Sinica, 2020, 39(10): 147-154. doi: 10.1007/s13131-020-1630-0

Oxidative stress responses to cadmium in the seedlings of a commercial seaweed Sargassum fusiforme

doi: 10.1007/s13131-020-1630-0
Funds:  The National Key R&D Program of China under contract No. 2018YFD0901500; the National Natural Science Foundation of China under contract Nos 41706147 and 41876124.
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  • Corresponding author: E-mail: binbch@163.commazengling@wzu.edu.cn
  • Received Date: 2019-11-18
  • Accepted Date: 2019-12-23
  • Available Online: 2020-12-28
  • Publish Date: 2020-10-25
  • Cadmium (Cd) is a common heavy metal pollutant in the aquatic environment, generally toxic to plant growth and leading to growth inhibition and biomass reduction. To study the oxidation resistance in Sargassum fusiforme seedlings in response to inorganic Cd stress, we cultured the seedlings under two different Cd levels: natural seawater and high Cd stress. High Cd stress significantly inhibited the seedlings growth, and darkened the thalli color. Additionally, the pigment contents, growth rate, peroxidase (POD) activity, dehydroascorbic acid (DHA) content, and glutathione reductase (GR) activity in S. fusiforme were significantly reduced by high Cd treatment. Contrarily, the Cd accumulation, Cd2+ absorption rate, dark respiration/net photosynthetic rate (Rd/Pn), ascorbic acid (Vc) content, soluble protein (SP) content, glutathione (GSH), and the activities of superoxide dismutase (SOD) and catalase (CAT) of S. fusiforme under Cd treatment significantly increased compared to the control group. The decrease of malondialdehyde (MDA) was not significant. Although S. fusiforme seedlings increased the antioxidant activities of POD, SOD, Vc, and the AsA-GSH cycle to disseminate H2O2 and maintain healthy metabolism, high Cd stress caused Cd accumulation in the stem and leaves of S. fusiforme seedlings. The excessive Cd significantly restricted photosynthesis and reduced photosynthetic pigments in the seedlings, resulting in growth inhibition and deep morphological color, especially of the stems. High levels of Cd in seawater had toxic effects on commercial S. fusiforme seedlings, and risked this edible seaweed for human food.
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