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New members of a group of DNA viruses infecting brown algae

Since 1990 virus infections have been described in six brown algal species of the genera Ectocarpus, Feldmannia, Hincksia and Myriotrichia. These pathogens can be experimentally transmitted to healthy isolates of their hosts. A synopsis including new molecular and biochemical data shows that these viruses share common characteristics: genomes of double‐stranded DNA, infection mode, morphology, extended temperence, and narrow host‐specificity. These properties distinguish the brown algal viruses from all other known plant viruses.