Abstract
Resistance to potato leafroll virus (PLRV) was detected in an accession of Solanum chacoense. Inoculations with viruliferous aphids and subsequent graft challenges using Datura tatula and potato as PLRV sources determined that resistance appears to be of an extreme type. Virus was not detectable using enzyme-linked immunosorbent assay (ELISA) in S. chacoense, and in resistant F1 and BC1 progenies after attempts to transmit the virus through grafting. The segregation ratios of BC1 progenies for positive and negative ELISA tests are consistent with simple dominant inheritance.
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