Abstract
Plant viruses can cause serious losses to most, if not all, major crops upon which depend for food. Many viruses are endemic, causing moderate losses each year. Others, such as those causing rice tungro, give periodic severe epidemics. There are no fully collated figures for world-wide losses due to viruses but some examples has been listed, i.e., rice tungro in SE ASIA and african cassava mosaic in Africa with 1,500 and 2,000 millions dollars per year in losses respectively.However, in recent years the understanding of the genome organisation of plant viruses has increased in parallel with development of molecular biological techniques. The ability to obtain nucleotide sequences of complete viral genomes has also permitted the elucidation and understanding of expression strategies used by many different plant viruses. This review is aimed to summarise some aspects of the main strategies used by plant viruses to express their genomes.
Highlights
Plant viruses can cause serious losses to most, if not all, major crops upon which depend for food
The ability to obtain nucleotide sequences of complete viral genomes has permitted the elucidation and understanding of expression strategies used by many different plant viruses
This review is aimed to summarise some aspects of the main strategies used by plant viruses to express their genomes
Summary
Plant viruses can cause serious losses to most, if not all, major crops upon which depend for food. The only nucleic acid found in plant viruses was RNA, but it is clear that viruses infecting plants may contain any one of the four types of genetic material: single-stranded RNA (ssRNA, about 75% of plant viruses), double-stranded RNA (dsRNA, reoviruses), single-stranded DNA (ssDNA, geminiviruses) or double-stranded DNA (dsDNA, caulimo- and badnaviruses). Of those for which the genome is known or can be extrapolated by being in the
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