title: Response of growth, photosynthesis and photoinhibition of the edible cyanobacterium Nostoc sphaeroides colonies to thiobencarb herbicide.
abstract: Effects of thiobencarb on growth, photosynthesis and photoinhibition of Nostoc sphaeroides colonies were examined. Thiobencarb concentrations higher than 2 mg/l led to a significant decrease in phycoerythrin, phycocyanin and allophycocyanin content, but no significant effect on chlorophyll a (chl a) content. Biomass yield, protein content and photosynthetic rate were reduced only in the highest thiobencarb concentration (10 mg/l). Colonies exposed to high thiobencarb dose (10 mg/l) were more sensitive to high light than those exposed to the control and 4 mg/l thiobencarb. Dim light induced recovery from photoinhibition to more great extent in colonies grown in the control and 4 mg/l thiobencarb than 10 mg/l thiobencarb. Darkness resulted in a insignificant recovery regardless of thiobencarb treatments.
authors.affiliation: Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, China. jrxia@stu.edu.cn
authors.forename: Jianrong
authors.initials: J
authors.lastname: Xia
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis; D018533:Biomass; D002681:China; D015169:Colony Count, Microbial; D005502:Food; D006540:Herbicides / Q000633:toxicity*; D046937:Nostoc / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D010788:Photosynthesis / Q000187:drug effects*; D013859:Thiocarbamates / Q000633:toxicity*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D001426:Bacterial Proteins; D006540:Herbicides; D013859:Thiocarbamates; D014874:Water Pollutants, Chemical; C037925:benthiocarb