Variation in growth rate, carbon assimilation, and photosynthetic efficiency in response to nitrogen source and concentration in phytoplankton isolated from upper San Francisco Bay.

ABSTRACT: Six species of phytoplankton recently isolated from upper San Francisco Bay were tested for their sensitivity to growth inhibition by ammonium (NH₄⁺ ), and for differences in growth rates according to inorganic nitrogen (N) growth source. The quantum yield of photosystem II (F_v /F_m ) was a sensitive indicator of NH₄⁺ toxicity, manifested by a suppression of F_v /F_m in a dose-dependent manner. Two chlorophytes were the least sensitive to NH₄⁺ inhibition, at concentrations of >3,000 μmoles NH₄⁺  · L^-1 , followed by two estuarine diatoms that were sensitive at concentrations >1,000 μmoles NH₄⁺  · L^-1 , followed lastly by

SUBMITTER: Berg GM 

PROVIDER: S-EPMC5518194 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature