Oxidative stress responses of submerged macrophyte Vallisneria asiatica to different concentrations of cyanobacteria

• Published in: Chinese journal of oceanology and limnology Vol. 33; no. 2; pp. 364 - 371
• Main Author: 康彩霞 KUBA Takahiro 郝爱民 ISERI Yasushi 李春杰 张振家
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 01.03.2015; Science Press; Springer Nature B.V
• Subjects: Algae; antioxidants; Aquaria; Aquarium fishes; Aquariums; Aquatic plants; Biology; Biomass; Catalase; Chlorophyll; Chlorophylls; Cyanobacteria; Earth and Environmental Science; Earth Sciences; Eutrophic lakes; Eutrophication; Inland waters; lakes; Leaves; macrophytes; Malondialdehyde; Oceanography; Oxidative stress; Peroxidase; Physiological effects; Plant biomass; protein content; Reactive oxygen species; reproduction; Restoration; roots; Stress response; Superoxide dismutase; Vallisneria; 可溶性蛋白质含量; 叶绿素a浓度; 氧化应激反应; 水浓度; 沉水植物; 苦草; 蓝藻; 超氧化物歧化酶; Taihu Lake; China, People's Rep., Tai Hu L; physiological response; macrophyte restoration; algal bloom
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-015-4084-z

In a 10-day aquarium experiment, this investigation examines macrophyte restoration in eutrophic Lake Taihu, the physiological effects of different plant biomass levels and of increasing natural cyanobacterial concentrations on a submerged macrophyte, Vallisneria asiatica. Cyanobacterial stress suppressed the superoxide dismutase （SOD） activity of the plant＇s leaves and induced the catalase （CAT） and peroxidase （POD） activities of its roots. The soluble protein content in V. asiatica decreased with an increase in natural cyanobacterial concentrations, whereas the malonaldehyde （MDA） increased significantly at chlorophyll a （Chl a） concentrations of 222 and 262 μg/L in water. V. asiatica adapted to the stress caused by cyanobacterial concentrations by adjusting its antioxidant defense system to remove the excessive reactive oxygen species when the algal Chl a concentration was 〉109 μg/L. Additionally, high biomass of V. asiatica （2 222 g FW/m^2） can inhibit the reproduction of cyanobacteria more significantly than low biomass （1 111 g FW/m^2）. High biomass of V. asiatica increased the oxidative stress in an individual plant when the initial Chl a concentration in the water reached 222 and 262 μg/L, as expressed by the increased MDA in leaves, compared with low biomass of K asiatica. This provides a basis for controlling cyanobacterial concentrations and V. asiatica biomass for the recovery of V. asiatica in eutrophic Lake Taihu.