title: Growth and photosynthesis limitation of marine red tide alga Skeletonema costatum by low concentrations of Zn2+.
abstract: The specific growth rate, cell final yields and extracellar carbonic anhydrase activity of the red tide alga Skeletonema costatum increased with increasing concentrations of Zn2+ from 0 to 12 pM, but decreased when Zn2+ was over 24 pM. However, cells grown under high concentrations of Zn2+ had higher activities of intracellular carbonic anhydrase than those grown under low concentrations of Zn2+. Chlorophyll a-specific light-saturated photosynthetic rate (P(Chla)), dark respiration rate (R(chla)) and apparent photosynthetic efficiency (alpha(chla)) significantly increased with increasing concentrations of Zn2+ from 0 to 3 pM, but decreased when increasing concentrations of Zn2+ from 3 to 66 pM. Photorespiration is the lowest when cells cultured in 3 pM Zn2+. The results suggest physiological activity of Skeletonema costatum is very sensitive to the prevailing concentration of Zn2+.
authors.affiliation: State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, P.O. Box 353, Beijing 100080, PR China. hhhu@home.ipe.ac.cn
authors.forename: Hanhua
authors.initials: H
authors.lastname: Hu
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Shi
authors.forename: Wei
authors.initials: W
authors.lastname: Cong
authors.forename: Zhaoling
authors.initials: Z
authors.lastname: Cai
mesh_terms: D002256:Carbonic Anhydrases / Q000378:metabolism*; D002455:Cell Division / Q000187:drug effects / Q000528:radiation effects; D019069:Cell Respiration / Q000502:physiology; D002478:Cells, Cultured; D002734:Chlorophyll / Q000378:metabolism*; D017377:Diatoms / Q000166:cytology / Q000187:drug effects* / Q000502:physiology* / Q000528:radiation effects; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D008027:Light; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology* / Q000528:radiation effects; D011836:Radiation Tolerance / Q000187:drug effects*; D012680:Sensitivity and Specificity; D015032:Zinc / Q000494:pharmacology*
chemical_list: D002734:Chlorophyll; D002256:Carbonic Anhydrases; D015032:Zinc