Soybean plants dually infected with soybean mosaic potyvirus (SMV) and either one of two comoviruses, cowpea mosaic virus (CMPV) or bean pod mottle virus (BPMV), showed greatly increased symptom severity over that induced by the individual viruses. The titer of the comovirus (but not of SMV) in the dually infected plants was significantly higher than that in singly infected plants. Electron microscopic examination of thin sections of leaves from dually infected plants revealed that both SMV and CPMV (or BPMV) were present in the same cells (...)
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J. R. N. dos Anjos (1992) studied this question.