Maximal growth rate at 30˚C

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