Abstract:
:The effect of light intensity on the rates of ammonium and nitrate uptake and of CO(2) fixation has been determined in intact Anacystis nidulans cells. Ammonium uptake became saturated at photon flux values of about 60 microeinsteins per square meter per second, whereas both nitrate uptake and CO(2) fixation reached saturation at about 250 microeinsteins per square meter per second, the rates of the two latter processes being tightly correlated at any light intensity assayed. Inhibition of ammonium assimilation resulted in the loss of correlation between CO(2) fixation and nitrate uptake, the latter process exhibiting then a reduced light requirement. The results establish a clear distinction between ammonium utilization and nitrate utilization with regard to their light requirement and to the nature of their dependence upon CO(2) fixation.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Lara C,Romero JMdoi
10.1104/pp.81.2.686subject
Has Abstractpub_date
1986-06-01 00:00:00pages
686-8issue
2eissn
0032-0889issn
1532-2548journal_volume
81pub_type
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