Abstract:
:The purpose of this research was to test the hypothesis that acclimation of the unicellular marine alga, Thalassiosira fluviatilis Hustedt, to short photoperiods results in decreased cellular concentrations of ribulose 1,5-bisphosphate carboxylase/oxygenase and decreased rates of light-saturated CO(2) uptake. Cells were acclimated to photoperiods of 6:18, 12:12, and 18:6 h:h light:dark, and concentrations of the large subunit of the enzyme and responses of CO(2) uptake to varying irradiance were measured. Concentrations of the large subunit, which weighed approximately 50 kilodaltons, were conserved while rates of CO(2) uptake under light saturation and limitation, and cellular contents of chlorophyll a increased as photoperiod decreased. Apparently, these cells acclimate to short photoperiods by increasing rates of CO(2) uptake under saturating irradiances by increasing in vivo activation of ribulose 1,5-bisphosphate carboxylase/oxygenase. Also, chlorophyll-specific concentrations and specific activities of the enzyme appear to be lower and higher, respectively, in diatomaceous algae than in higher plants.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hobson LA,Morris WJ,Guest KPdoi
10.1104/pp.79.3.833subject
Has Abstractpub_date
1985-11-01 00:00:00pages
833-7issue
3eissn
0032-0889issn
1532-2548journal_volume
79pub_type
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