Abstract
Abstract -Nitrates may induce alterations in NO-signaling system and change photosynthesis in plants. Significant reduction of 14CO2 fixation was noted at concentration of 3.96 mM NaNO3 in an aquatic macrophyte (Typha angustifoliaL.). Assimilation of 14CO2 seven days after the introduction of nitrates did not differ between control and experimental samples. There were changes in distribution of 14C among products of 4CO2 fixation 4 h after NaNO3 addition, resulting in increased sugar radioactivity in experimental plants. It was suggested that the observed changes may have regulatory importance.
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