“…PRs have been observed in different ocean regions (Béjà et al, 2000(Béjà et al, , 2001de la Torre et al, 2003;Man et al, 2003;Sabehi et al, 2003Sabehi et al, , 2004Sabehi et al, , 2005Venter et al, 2004;Frigaard et al, 2006) and are found in diverse taxonomic backgrounds, including the ubiquitous marine gammaproteobacterial SAR86 (Béjà et al, 2000;Sabehi et al, 2004Sabehi et al, , 2005 and alphaproteobacterial SAR11 (Giovannoni et al, 2005a, b;Sabehi et al, 2005) groups, as well as in marine Bacteroidetes (Venter et al, 2004;Gó mez-Consarnau et al, 2007), planktonic Archaea (Frigaard et al, 2006) and other microbial taxa (de la Torre et al, 2003;Sabehi et al, 2003Sabehi et al, , 2005Venter et al, 2004;McCarren and DeLong, 2007). While previous work did not detect light enhanced growth in PR-containing SAR11 (Giovannoni et al, 2005a), or in the gammaproteobacterial SAR92 (Stingl et al, 2007) isolates grown in seawater, significant enhancement of both growth rate and yield was recently reported in PR-expressing marine Bacteroidetes (Gó mez- Consarnau et al, 2007).…”