Complementary chromatic adaptation alters photosynthetic strategies in the cyanobacterium Calothrix

Article Abstract:

Complementary chromatic adaptation changes the electron transport from photosystem (PS) II to PS I and increases the light-harvesting capacity of the cyanobacteria Calothrix strain PCC 7601. The amount of oxygen produced, which is a measure of light utilization, is similar during growth in both red and green light. Oxygen production decreases by 40%, if the cells acclimated to one light are shifted to the other. The cells growing in red light are in state I with low energy transfer from PS II to PS I, while the cells growing in green light are in state II with high energy transfer from PS II to PS I.

Observations, Adaptation (Physiology), Physiological adaptation, Energy transfer

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Synthesis and proteolytic degradation of nitrogenase in cultures of the unicellular cyanobacterium Gloeothece strain ATCC 27152

Article Abstract:

Research was conducted to examine the synthesis and proteolytic degradation of nitrogenase in cultures of the unicellular cyanobacterium Gloeothece strain ATCC 27152. Gloeothece cultures were studied under alternating 12 hrs of light and 12 hrs of darkness to investigate whether the decline in N2 fixation that takes place in the organism towards the end of the dark period can be explained based on nitrogenase degradation. Results indicate that the nitrogenase-specific proteolytic system in extracts of Gloeothece is stimulated directly by O2 rather than by O2-inactivation of its substrate.

Proteases, Nitrogenase, Unicellular organisms

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Chlorophyll fluorescence analysis of cyanobacterial photosynthesis and acclimation

Article Abstract:

Research was conducted to examine pulse-amplitude modulated fluorescence as a rapid, noninvasive regulator of photosynthesis and acclimation in cyanolichens and cyanobacteria. The limitations of potentials of fluorescence analysis for the ecological and physiological extraction information from cyanobacteria are summarized. Results indicate that the size of state transition may be useful as a measure of iron limitation.

Analysis, Measurement, Fluorescence, Chlorophyll, Acclimatization (Plants), Plant acclimatization

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