Total RNA was isolated from budwood obtained from infected apple (1), cherry (2), pear (3), and grapevine (4–8), leaf tissue from black currant (9, 10), and dormant tuber tissue from infected potato (11, 12) using a modification of the RNeasy protocol. Viral RNA was amplified using a one-tube RT-PCR. Amplification products were analyzed on a 1.5% agarose gel. M: DNA Markers VI, Boehringer Mannheim. (Data kindly provided by D.J. MacKenzie, Centre for Plant Health, Agriculture and Agri-Food Canada and M.A. McLean, Euro Nursery & Vineyard (West) Inc., Sidney, Canada.)
Formaldehyde agarose gel and northern blot of total RNA (7 µg) from indicated tissues of tomato. Blot was hybridized with a 32P-labeled DNA probe for the tomato histone H4 gene. M: 0.24-9.5 kb RNA ladder. (Plant tissues and histone H4 cDNA clone kindly provided by K. Theres, MPI for Breeding Research, Cologne, Germany.)
