+ Translate

Regulation of growth and photosynthesis by oscillatoria agardhii grown with a light dark cycle

, : Regulation of growth and photosynthesis by oscillatoria agardhii grown with a light dark cycle. FEMS Microbiology Ecology 31(2): 97-102

The cyanobacterium Oscillatoria agardhii was grown in turbidostat cultures with the light energy supply in either the continuous mode or in the pulsed mode (8/16 h light/dark (L/D) cycle). The light irradiance value used was sufficient to allow the maximal growth rate to be attained, when supplied continuously. Adaptation of O. agardhii to the L/D cycle was characterized by an increase in pigment content and photosynthetic performance, accompanied by a decrease in growth rate. This mode of adaptation resembled the adaptation of O. agardhii to continuous low light intensities. It is suggested that in this case the L/D cycle provokes this adaptation in order to allow the cells to accumulate carbohydrate rapidly during the light period. This was attributed to the storage of polyglucose, which served as a carbon and energy source for growth in the dark. The utilization of polyglucose in the dark was able to sustain the synthesis of all other cell components at the same rate as when cells were growing in the light. The growth yield in the dark, whilst metabolizing internally stored polyglucose, was 0.52 g cell C/G polyglucose C, or 0.62 g cell dry weight/g polyglucose. Although in the pulsed mode there is a 66% loss in light irradiance per 24 h when compared with a continuous light regime, the growth rate of the cyanobacteria grown in the pulsed mode was only 35% lower than the growth rate of a culture grown in continuous light. This can be explained by a high growth yield in the dark and by increased CO2 fixation rates in the light of cells grown in the pulsed mode.

(PDF 0-2 workdays service)

Accession: 006288281

Submit PDF Full Text: Here

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Related references

Van Liere L.; Mur L.R.; Gibson C.E.; Herdman M., 1979: Growth and physiology of oscillatoria agardhii cultivated in continuous culture with a light dark cycle. Archives of Microbiology 123(3): 315-318

Liere, L.V.n; Mur, L.; Gibson, C.; Herdman, M., 1979: Growth and physiology of Oscillatoria agardhii Gomont cultivated in continuous culture with a light-dark cycle. Archives of microbiology 123(3): 315-318

Post A.F.; D.W.t R.; Mur L.R., 1985: Interactions between temperature and light intensity on growth and photosynthesis of the cyanobacterium oscillatoria agardhii. Oscillatoria agardhii was grown in turbidostat cultures under a 16/8 h light/dark cycle at various combinations of light intensity and temperature. Temperature was found to influence only the maximal growth rate; this relationship was linear over...

Post A.F.; Loogman J.G.; Mur L.R., 1986: Photosynthesis carbon flows and growth of oscillatoria agardhii in environments with a periodic supply of light. The cyanobacterium Oscillatoria agardhii was grown in continuous cultures with light periods of various duration at a constant irradiance. Growth at shorter light periods led to light-limited cultures. Pmax was the only photosynthetic parameter th...

Post, A.; Loogman, J.; Mur, L., 1986: Photosynthesis, carbon flows and growth of Oscillatoria agardhii gomont in environments with a periodic supply of light. Journal of general microbiology 132(8): 2129-2136

Post, A.F., 1986: Transient state characteristics of adaptation to changes in light conditions for the cyanobacterium oscillatoria agardhii i. pigmentation and photosynthesis. Transitions in growth irradiance level from 92 to 7 .mu.Em-2 s-1 and vice versa caused changes in the pigment contents and photosynthesis of Oscillatoria agardhii. The changes in chlorophyll .alpha. and C-phycocyanin contents during the transition...

Riegman, R.; Rutgers, M.; Mur, L.R., 1985: Effects of photoperiodicity and light irradiance on phosphate limited oscillatoria agardhii in chemostat cultures 1. photosynthesis and carbohydrate storage. The cyanobacterium O. agardhii was grown in continuous culture under various light conditions in order to study the interactions of light on P limited growth. Under severe P-limiting (light-saturating) conditions, a low chlorophyll .alpha. and C-p...

Van Liere L.; Mur L.R., 1979: Growth kinetics of oscillatoria agardhii in continuous culture limited in its growth by the light energy supply. Growth efficiency (c) and specific maintenance rate constant (.mu.e) were determined in continuous cultures of the cyanobacterium O. agardhii Gomont, in light energy-limiting conditions, according to the formula .mu. = in which qE is the...

Wernicke P.; Nicklisch A., 1986: Light dark cycle and temperature their impact on phosphate limited growth of oscillatoria redekei van goor in semicontinuous culture. Phosphate limited growth of Oscillatoria redekei in semicontinuous culture has been studied under conditions of continuous illumination at C as well as in a 12/12 hours light-dark cycle at temperatures between C and

Tipa L., 1972: The influence of sodium calcium and iron on biomass growth in the blue algae oscillatoria agardhii and oscillatoria terebriformis. Studii si Cercetari de Biologie Seria Botanica 24(4): 349-356