Table 1.

Chloroplast Genome Features of T. oceanica in Comparison with T. pseudonana and P. tricornutum

	Thalassiosira oceanica CCMP 1005	Thalassiosira pseudonana CCMP 1335	Phaeodactylum tricornutum CCAP 1055/1
genome size [bp]	141 790	128 814	117 369
LSC	70 298	65 250	63 674
SSC	24 106	26 889	39 871
IR	23 693	IRa: 18 338	6 912
		IRb: 18 337
G+C content [%]	30,39	30,66	32,56
A+T content [%]	69,61	69,34	67,44
gene content [#]	158+2	159	162
protein coding	126 +orf127	127	130
rRNA	3	3	3
tRNA	27	27	27
other RNAs	2 +flrn	2	2
in T. oceanica, but not in T. pseudonana	orf127a, flrn
in T. pseudonana, but not in T. oceanica		petFa
in IR of T. oceanica, but not in IR of T. pseudonana	clpC, trnC, trnL
in P. tricornutum only			tsf, syfB, acpP

^a presence or absence of petF and orf127 in T. oceanica is the result of a gene transfer event

Genes duplicated in the IR are counted once. The increased genome size of T. oceanica can conveniently be explained by an expansion of the IR region. Orf127 and flrn are potential pseudogenes and are listed as additional gene content (+2).