Effects of thiobencarb on growth, photosynthesis and photoinhibition ofNostoc sphaeroidescolonies were examined.
Thiobencarb concentrations higher than 2 mg/l led to a significant decrease in phycoerythrin, phycocyanin and allo-phycocyanin content, but no significant effect on chlorophylla(chla) content. Biomass yield, protein content and pho-tosynthetic 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 thio-bencarb than 10 mg/l thiobencarb. Darkness resulted in a insignificant recovery regardless of thiobencarb treatments.
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