Potatoes, a major vegetatively-propagated crop, has been closely linked
with plant virus research during the last 8 decades because, without
their effective control potato viruses can cause considerable losses of
crop quality and yield. Such research has resulted in marked advances in
diagnosis, from relatively simple biological and serological tests to
electron microscopy, sophisticated serological procedures and, more
recently, the use of polymerase chain reaction (PCR) and nucleic acid
hybridization methods. Associated tissue culture research during the
past forty years or so has resulted in the successful production of
virus-free plants from potato cultivars that were totally infected.
Nevertheless, in many countries the high incidence of virus infection
still causes considerable yield losses. Because of their importance,
potato viruses have also long been important subjects for research; much
is thus now known about their intrinsic biological and physico-chemical
properties, genomes, gene functions, virus-vector relationships
(including specific sites of interaction between viral coat protein and
the vector) and their potential as vehicles for transformation.