Double-Stranded RNA from Plants Infected with Closteroviruses

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Abstract
Expected double-stranded [ds] RNA replicative forms (RF) and unexpected smaller dsRNA were isolated by chromatography on CF-11 cellulose from extracts of plants infected with closteroviruses. MW of RF were estimated to be 13.3 .times. 106 for citrus tristeza virus (CTV) by EM, 8.4 .times. 106 for beet yellows virus (BYV) and carnation necrotic fleck virus (CNFV), and 4.6 .times. 106 for apple chlorotic leafspot virus (ACLSV) by gel electrophoresis. The patterns of dsRNA segments resolved by polyacrylamide gel electrophoresis were distinct for each virus, but were sufficiently similar for BYV, CNFV and CTV to be diagnostic for closteroviruses. There was little variation in the pattern of dsRNA segments detected in extracts from groups of plants of a single host, from different tissue sources of a single host, from different hosts, and from the 1st pellet normally discarded from a CTV and BYV purification scheme. A higher yield of dsRNA was recovered from bark or from recently expanded leaves than from other sources. Sufficient amounts of dsRNA were routinely obtained from only 0.2-7.0 g of tissue.

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