Table 1. Sequenced Alpha-Proteobacterial strains containing GTA gene cassettes and screened for GTA production over time.

Isolate Name	ATCC strain number	Maximum GTA production	Genome Accession Number (Refseq)	Locus tag- GTA Terminase/GTA ORF 15	Growth Media	Preferred temp
Rhodobacter capsulatus SB1003WT	Gift from Oregon State University	yes (type strain, 105 gene transfer units ml−1), Solioz et.al., 1975	NC_ 014034	RCAP_rcc01683 RCAP_rcc01698	PYE, YPS, LB or OM	30°C aerobic, or anaerobic with light
Roseobacter denitrificans OCH114	ATCC® 33942TM	not observed	NC_ 008209	RD1_3034 RD1_3016	Marine Broth 2216	26°C aerobic
Oceanicola granulosus HTCC2516	ATCC® BAA861TM	yes, (2.9×106 ml−1)	NZ_ AAOT00000000	OG2516_04279 OG2516_04219	Marine Broth 2216	30°C aerobic
Roseovarius nubinhibens ISM	ATCC® BAA591TM	yes, (1×109 ml−1)	NZ_ AALY00000000	ISM_05135 ISM_05210	Marine Broth 2216	30°C aerobic
Ruegeria (Silicibacter) pomeroyi DSS-3	ATCC® 700808TM	yes, (×108 ml−1) Biers et.al., 2008	NC_ 003911	SPO2266 SPO2250	Marine Broth YTSS	28°C aerobic
Oceanicaulis alexandrii	Gift from Oregon State University	not observed	NZ_ AAMQ00000000	OA2633_14805 OA2633_14855	Marine Broth 2216	20°C aerobic
Aurantimonas manganoxydans SI85-9A-1	ATCC® BAA-1229	not observed	NZ_ AAPJ00000000	SI859A1_01033 SI859A1_08129	#2584 Broth: buffered marine media with Mn	30°C aerobic
Parvularcula bermudensis	ATCC® BAA594TM	pending	NC_ 014414	PB2503_08059 PB2503_08129	Marine Broth 2216	30°C aerobic
Nitratireductor , strain 44B9s	Isolated from Symbiodinium associated with a Gorgonian	yes (2×109 ml−1)	N/A	N/A	Marine Broth 2216	26°C aerobic
Ruegeria mobilis, strain 45A6	Isolated from a Clade D2 Symbiodinium associated with a Foraminifera	yes (1×109 ml−1)	Pending	Pending	Marine Broth 2216	26°C aerobic

The strains screened for this study are indicated in bold type. Maximum abundance of GTA particles observed in parentheses.