Varying Photoperiod, Ribulose 1,5-Bisphosphate Carboxylase/Oxygenase and CO(2) Uptake in Thalassiosira fluviatilis (Bacillariophyceae).

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 Physiol

journal_title

Plant physiology

authors

Hobson LA,Morris WJ,Guest KP

doi

10.1104/pp.79.3.833

subject

Has Abstract

pub_date

1985-11-01 00:00:00

pages

833-7

issue

3

eissn

0032-0889

issn

1532-2548

journal_volume

79

pub_type

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