| Zhang Tiantian,Hong Minheng,Wu Mingjiang,Chen Binbin,Ma Zengling. 2020. Oxidative stress responses to cadmium in the seedlings of a commercial seaweed Sargassum fusiforme. Acta Oceanologica Sinica, 39(10):147－154 |
| Oxidative stress responses to cadmium in the seedlings of a commercial seaweed Sargassum fusiforme |
| 经济海藻羊栖菜（Sargassum fusiforme）幼体对镉胁迫的响应特性 |
| Received:November 18, 2019 |
| DOI：10.1007/s13131-020-1630-0 |
| Key words:Sargassum fusiforme cadmium stress oxidation resistance photosynthesis aquaculture marine pollution |
| 中文关键词: 羊栖菜 镉胁迫 抗氧化活性 光合作用 水产养殖 海洋污染 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | Zhang Tiantian | College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China | | | Hong Minheng | College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China | | | Wu Mingjiang | College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China | | | Chen Binbin | College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China | binbch@163.com | | Ma Zengling | College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China
Zhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China | mazengling@wzu.edu.cn |
|
| Hits: 619 |
| Download times: 480 |
| Abstract: |
| 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. |
| 中文摘要: |
| 镉(Cd)是水生生态环境中常见的重金属污染物,通常会抑制植物的生长,减少生物量,对植物产生毒害作用。为了研究羊栖菜幼苗对海水中Cd胁迫的抗氧化响应特性,我们在天然海水和Cd加富(100 μmol·L-1)海水两种不同的Cd浓度下培养羊栖菜幼体。实验结果表明:Cd加富胁迫显著抑制了羊栖菜幼苗生长,使藻体颜色变暗。此外,高Cd处理显著降低了羊栖菜中的色素含量,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,高Cd处理显著促进了藻体内的Cd元素积累、对Cd2+吸收速率,并增加了其暗呼吸/净光合速率比值(Rd/Pn),抗坏血酸(Vc)含量,可溶性蛋白质(SP)含量,且还原型谷胱甘肽(GSH)以及羊栖菜的超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性均显著增加,但对丙二醛(MDA)的影响不显著。虽然羊栖菜幼苗增加了其抗氧化活性并促进AsA-GSH循环,以产生H2O2并维持健康的新陈代谢,但高Cd胁迫显著限制了幼苗的光合作用,降低了其光合色素,抑制了其生长,并使其藻体颜色发生变化。海水中高浓度的Cd对羊栖菜幼苗具有毒性作用,并且极大地增加了这种海藻的食用风险。 |
|
HTML
View Full Text
View/Add Comment Download reader |
| Close |
|
|
|
