TABLE 7.7.

Expression strategies of (+)-strand ssRNA plant viruses

Family	Genus	Termini		Expression strategies
		5’	3’	Genome segments	Sub-genomic	Read- Frame-through shift	Proteolytic Other cleavage
Bromoviridae	Broinovirus	Capa	t	3	1
	Alfamovirus	Cap	c	3	1
	Cucumovirus	Cap	t	3	1
	Ilarvirus	Cap	c	3	1
	Oleavirus	Cap	c	3	1
Comoviridae	Comovirus	VPg	An	2			+ 2-startb
	Fabavirus	?VPg	An	2			+
	Nepovirus	VPg	An	2			+
Potyviridae	Potyvirus	VPg	An	1			+
	Ipomovirus	?VPg	An	1			+
	Macluravirus	?VPg	An	1			+
	Rymovirus	?VPg	An	1			?+
	Tritimovirus	?VPg	An	1			+
	Bymovirus	?VPg	An	2			+
Tombusviridae	Tombusvirus		OH	1	2	+
	Avenavirus		OH	1	1	+
	Aureusvirus		OH	1	2	+
	Carmovirus		OH	1	2	+
	Dianthovirus	Cap	OH	2	1	−1
	Machlomovirus	Cap	OH	1	+	+ 2	2-start
	Necrovirus		OH	1	2	+
	Panicovirus		OH	1	1	+ −1
Sequiviridae	Sequivirus	?VPg	An	1			+
	Waikavirus	?VPg	An	1			+
Closteroviridae	Closterovirus	?Cap	OH	1	7–10	+ 1	+
	Crinivirus	?Cap	OH	2	+	+ 1
Luteoviridae	Luteovirus		OH	1	+	+ +
	Polerovirus	VPg	OH	1	+	+ +
	Enamovirus	VPg	OH	1	+	+ +
No family	Tobamovirus	Cap	t	1	2	+
	Tobravirus	Cap	OH	2	+	+
	Potexvirus	Cap		1	2
	Carlavirus	?Cap	An	1	2
	Allexivirus	?Cap	An	1	+
	Capillovirus	?Cap	An	1	2
	Fovcavirus	Cap	An	1	+
	Trichovirus	Cap	An	1	2
	Vitivirus	Cap
	Furovirus	Cap	t	2	+	+
	Pecluvirus	?Cap		2	+	+
	Pomovirus	Cap	t	3	+	+
	Benyvirus	Cap	An	4	+	+	+ 2-start
	Hordeivirus	Cap	t	3	+
	Sobemovirus	VPg		1	+	+ CfMV	+
	Marafivirus	Cap		1	+		+
	Tymovirus	Cap	t	1	1		+ 2-start
	Ourmiavirus			3
	Umbravirus		OH	1	+	+

^aAn = poly(A); c = conserved 3’ sequence between genome segments; Cap = cap sequence; OH = hydroxyl 3’ terminus; t = tRNA-like sequence; VPg = genomic viral protein.

^bTwo translational starts on same ORF.