Ultraviolet stress delays chromosome replication in light/dark synchronized cells of the marine cyanobacterium Prochlorococcus marinus PCC9511

Table 3 Growth parameters of PCC9511 batch cultures shifted from HL to HL+UV during 12 h/12 h L/D cycles.

Growth Parameters*	Cycle 1 (HL)	Cycle 2 (HL+UV)	Cycle 3 (HL+UV)
μ_cc (d^-1)	0.69 ± 0.02	0.61 ± 0.01	0.45 ± 0.00
μ_nb (d^-1)	0.64 ± 0.05	0.45 ± 0.02	0.1 ± 0.02
T_G1 (h)	18.0 ± 0.6	21.4 ± 0.3	29.3 ± 0.2
T_S (h)	3.67 ± 0.14	3.72 ± 0.09	6.25 ± 0.03
T_G2 (h)	2.33 ± 0.14	2.28 ± 0.09	1.75 ± 0.03
S_r	25.0 ± 0.7	21.9 ± 0.2	21.5 ± 0.1

Values shown are averages (± mean deviation) of two biological replicates
*Growth rates per day calculated from: cell cycle data (μ_cc) or cell numbers (μ_nb); T_G1, T_S, T_G2: cell cycle phase duration in hours; S_r: rate of synchronization estimated from the ratio (T_S+T_G2)/(T_G1+T_S+T_G2)

ISSN: 1471-2180