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Table 1 Characters which demarcate virus isolates as distinct species in the families Potyviridae and Geminiviridae


Characters	Potyviridae	Geminiviridae

Genome features	-	Different numbers of genome components
	-	Different organization of genes in the genome
	-	No transcomplementation of gene products
	-	No pseudorecombination between components

Genome sequence	Less than 85% identical over whole sequence	Less than 90% identical over genome component A
	Less then 75% identical in 3 non coding region	-

Protein feature	Different polyprotein cleavage sites	-
	Virions react differently with certain antibodies	Virions react differently with ceratin antibodies
	Less than 85% identical in coat protein sequence	Less than 90% identical in coat protein sequence

Transmission	Different vector species	Different vector species

	Different seed transmissibility	-
Effects in infected tissue	Different inclusion body morphology	-
Effects in infected tissue	No cross protection effects	Different tissue tropism

Host range	Different hosts	Different hosts