Growth and photosynthesis limitation of marine red tide alga Skeletonema costatum by low concentrations of Zn2+.
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+.
Hu
Hanhua
H
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
Shi
Yanjun
Y
Cong
Wei
W
Cai
Zhaoling
Z
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*
D002734:Chlorophyll; D002256:Carbonic Anhydrases; D015032:Zinc