Carotenoid accumulation in E. coli co-transformants.

aCm, chloramphenicol resistance; Amp, ampicillin resistance. Genes in plasmid are shown in brackets. “Carotenoid mutant” genotype is shown in square brackets.b-, carotenoid not detected. All data are given in ng per gram dry weight. Data are averages and standard errors. Phytoene was not detected in any co-transformation.cThe gene for phytoene dehydrogenase from E. uredovora (crtI) has been replaced by the gene from P. blakesleeanus (carB), so this plasmid would be the same kind of “carotenoid mutant” as pAVB16.