| Range |
≤0.2 (doubling time of 3.5h) hour^-1
|
| Organism |
Cyanobacteria Synechococcus PCC7002 |
| Reference |
Bernstein et al., Effect of mono- and dichromatic light quality on growth rates and photosynthetic performance of Synechococcus sp. PCC 7002. Front Microbiol. 2014 Sep 195:488. doi: 10.3389/fmicb.2014.00488. p.3 right column 2nd paragraph & p.7 left column 2nd paragraphPubMed ID25285095
|
| Method |
"The current study reports growth experiments performed with
optically-thin turbidostat cultures of Synechococcus 7002 under
different monochromatic and dichromatic light regimes to test
the combinatorial effects of light quality and growth rate on photophysiology. Specific growth rate was light-limited and at Ii [incident irradiance] of
275µmol photons/m^2/sec approached a maximum of 0.20
h^-1 (3.5 h doubling time: 30°C), which is exceptionally fast for
cyanobacteria in general. While a similar 3.5h doubling time
was previously reported for Synechococcus 7002, these measurements were conducted at a higher temperature of 38°C using
nitrate rather than ammonia as the sole N source (Sakamoto
and Bryant, 2002)." |
| Comments |
"Rapid specific growth rates (µ) of up to 0.2h^-1 (doubling time
of 3.5h) were achieved when Synechococcus 7002 was cultivated in turbidostat mode under light-limited conditions at 30°C
(Figure 1A). Cell densities of 0.09(OD730), corresponding to
34±4 mg[AFDW]L^-1, were constantly maintained to reduce self-shading in the photobioreactor...Physiological light limitation in the steady-state turbidostat
cultures of Synechococcus 7002 was evinced by the observation
that growth and net O2 evolution responded linearly (i.e., first-
order response) with increasing scalar incident irradiance (Ii)
(Figures 1A,B). The specific growth rate increased linearly at
Ii=275µmol photons/m^2/sec but began to asymptotically
approach a maximum value (0.2h^-1) at irradiances above this
value (data not shown)." AFDW=ash-free dry weigh. |
| Entered by |
Uri M |
| ID |
111251 |