生态环境学报 ›› 2021, Vol. 30 ›› Issue (5): 1034-1041.DOI: 10.16258/j.cnki.1674-5906.2021.05.016

• 研究论文 • 上一篇    下一篇

无机砷短期胁迫对铜藻幼苗氧化损伤、抗氧化酶及抗氧化物的影响

张鹏1(), 刘玮2,*(), 王铁杆1, 钟晨辉3, 陶月良4   

  1. 1.浙江省海洋水产养殖研究所/浙江省近岸水域生物资源开发与保护重点实验室,浙江 温州 325000
    2.山东省海洋生物研究院藻类研究中心,山东 青岛 266104
    3.福建省水产研究所/福建省海洋生物增养殖与高值化利用重点实验室,福建 厦门 361000
    4.温州大学生命与环境科学学院,浙江 温州 325000
  • 收稿日期:2020-12-14 出版日期:2021-05-18 发布日期:2021-08-06
  • 通讯作者: * 刘玮(1981年生),助理研究员,博士,主要从事大型海藻增殖及生理生态研究。E-mail:liuwei_mbi@163.com
  • 作者简介:张鹏(1982年生),男,高级工程师,硕士,主要从事大型藻类生理生态和遗传育种。E-mail:zhangpeng20011918@163.com
  • 基金资助:
    农业部藻类产业技术体系(CARS-50);国家重点研发计划项目(2018YFC1406300)

Impacts of Short-term Inorganic Arsenic Stress on Oxidative Damage, Antioxidant Enzymes and Antioxidant in Germlings of Sargassum horneri

ZHANG Peng1(), LIU Wei2,*(), WANG Tiegan1, ZHONG Chenhui3, TAO Yueliang4   

  1. 1. Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-resource/Zhejiang Mariculture Research Institute, Wenzhou 325000, China
    2. Algae Research Center, Marine Biology Institute of Shandong Province, Qingdao 266104, China
    3. Key Laboratory of Cultivation and High-value Utilization of Marine Organisms in Fujian Province/Fisheries Research Institute of Fujian, Xiamen 361000, China
    4. Wenzhou University, Wenzhou 325000, China
  • Received:2020-12-14 Online:2021-05-18 Published:2021-08-06

摘要:

为探讨无机砷胁迫对铜藻(Sargassum horneri)的生理影响,对铜藻幼苗在不同浓度(0、50、100、150、200 mmol∙L-1)的As3+、As5+短期胁迫条件下其氧化损伤、抗氧化酶、抗氧化物等8项生理指标进行了测定。结果显示,随着As3+、As5+浓度的增加,铜藻体内的氧自由基(Oxygen free radical,OFR)产生速率、丙二醛(Malondialdehyde,MDA)含量明显升高,铜藻细胞损伤率也同时上升。As3+、As5+对铜藻的半效应浓度(Median effect concentration,EC50)分别为50.1、116.3 mmol∙L-1。随As处理浓度升高,藻体超氧化物歧化酶(Superoxide dismutase,SOD)和过氧化物酶(Peroxidase,POD)活性呈上升趋势,而过氧化氢酶(Catalase,CAT)活性则无明显变化。谷胱甘肽(Glutathione,GSH)含量随As3+浓度的增加呈先升后降,而随As5+浓度的增加总体呈上升趋势。非蛋白巯基化合物(Non-protein thiol,NPT)含量随As3+、As5+浓度的升高而先升后降。对铜藻抗氧化系统主成分分析表明,As3+ 50mmol∙L-1及As5+ 100mmol∙L-1实验组的铜藻抗氧化综合得分较高;随着As3+、As5+浓度的升高,抗氧化物(GSH、NPT)对铜藻抗氧化系统的贡献减弱,而抗氧化酶(SOD、POD)对铜藻抗氧化系统的贡献相对增强。

关键词: 价态, 抗氧化酶, 抗氧化物, 主成分分析, 半效应浓度

Abstract:

To explore the impact of inorganic arsenic stress on physiology of Sargassum horneri, the 8 physiological indexes about oxidative damage, antioxidant enzymes and antioxidant were detected while the germlings of S. horneri were shortly treated with different concentrations (0, 50, 100, 150, 200 mmol∙L-1) of As3+ and As5+, respectively. The results showed that rate of oxygen free radical (OFR) production and content of malondialdehyde (MDA) in S. horneri seedlings increased significantly with increasing concentration of As3+ or As5+, and the damage rate of cellular was also elevated simultaneously. The medium effect concentrations (EC50) of As3+ and As5+ to S. horneri were 50.1 and 116.3 mmol∙L-1, respectively. Activities of superoxide dismutase (SOD) and peroxidase (POD) showed an upward trend in general, while catalase (CAT) varied insignificantly. The content of glutathione (GSH) increased first and then decreased with increase of As3+ concentration, whereas it showed an overall upward trend with increase of As5+ concentration. The content of non-protein thiol compound (NPT) tended to ascend first, then reduce with increasing As3+ or As5+ concentration. The principal component analysis of the S. horneri antioxidant system showed that the 50 mmol∙L-1 (As3+) and 100 mmol∙L-1 (As5+) treatments had higher comprehensive score of antioxidant system rather than others. As the concentration of As3+ and As5+ increased, the contribution of antioxidants (GSH, NPT) to the S. horneri antioxidant system weakened, while the contribution of antioxidase (SOD, POD) to the antioxidant system increased relatively.

Key words: valence state, antioxidase, antioxidant, principal component analysis, medium effect concentration

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