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 (R_d/P_n), 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.

镉（Cd）是水生环境中常见的重金属污染物，通常对植物生长有毒并导致生长抑制和生物量减少。为了研究羊栖菜幼苗对无机镉胁迫的抗氧化能力，我们在两种不同的镉水平下对幼苗进行了培养：天然海水和高镉胁迫。高镉胁迫显着抑制了幼苗的生长，使沙色变深。此外，通过高Cd处理可显着降低梭形葡萄球菌的色素含量，生长速率，过氧化物酶（POD）活性，脱氢抗坏血酸（DHA）含量和谷胱甘肽还原酶（GR）活性。相反，Cd积累，Cd ²⁺吸收率，暗呼吸/净光合速率（R _d / P _n），抗坏血酸（Vc）含量，可溶性蛋白（SP）含量，谷胱甘肽（GSH）以及在Cd处理下的梭状链霉菌的超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性均显着增加到对照组。丙二醛（MDA）的减少不明显。尽管梭状芽胞杆菌幼苗增加了POD，SOD，Vc和AsA-GSH循环的抗氧化活性以传播H ₂ O ₂并保持健康的代谢，但高Cd胁迫导致Cd在梭状芽孢杆菌茎和叶中积累。幼苗。过量的镉显着限制了幼苗的光合作用，减少了光合色素的生成，导致生长受到抑制，并且形态颜色深，尤其是茎。海水中高含量的镉对商业梭状芽胞杆菌幼苗有毒害作用，并使这种食用海藻成为人类食物的风险。