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Viroids, small RNA pathogens capable of infecting flowering plants, coexist in the field with parasitic plants that infest many crops. The ability of viroids to be exchanged between host and parasitic plants and spread in the latter has not yet been investigated.We studied the interaction between the Potato spindle tuber viroid (PSTVd) and Branched bromrape (Orobanche ramosa) using the tomato, Solanum...