The complete chloroplast DNA sequences of the charophycean green algae Staurastrum and Zygnema reveal that the chloroplast genome underwent extensive changes during the evolution of the Zygnematales

Table 3 Differences between the gene repertoires of Staurastrum, Zygnema, Chaetosphaeridium and Marchantia cpDNAs

Gene^a	Staurastrum	Zygnema	Chaetosphaeridium	Marchantia
chlI	+	+	+	-
cysA	-	+	-	+
cysT	-	+	-	+
odpB	+	+	+	-
rpl5	-	+	+	-
rpl22	+	-	+	+
rpl32	-	-	+	+
rps16	+	+	+	-
tufA	-	-	+^c	-
ycf62	+	+	+	-
trnP(ggg)	-	+	+	-^b
trnS(cga)	-^b	+	-	-

^a Only the conserved genes that are missing in one or more chloroplast genomes are indicated. Plus and minus signs denote the presence and absence of genes, respectively.
^b Pseudogenes.
^c Chaetosphaeridium tufA could be a pseudogene because its sequence is highly divergent from those of other green plants.