The transmission of grapevine yellow speckle viroid 1 and hop stunt viroid
via seeds was confirmed in 11 seedlings of eight grapevine (Vitis vinifera)
varieties using a combination of reverse transcription-polymerase chain re
action, dot-blot hybridization and Northern hybridization assays. The viroi
d profiles found in nine seedlings indicate a differential transmission of
viroids via seeds similar to the differential reduction of viroids observed
in vines regenerated after shoot apical meristem culture.