Ed Rybicki wrote:
>Why do algae have such big dsDNA viruses, while
> land plants do not? A case of the one that stayed behind developing
> a new kind of virus? Viral "founder effects"?
A big dsDNA virus likely would have a difficult time moving in, through,
and out the vascular tissue of higher plants; such restrictions may not
be applicable to algae. In other words, I believe part of the reason
for higher plants viruses, in general, having relatively small genomes
is due to the vastly different method of colonization of the host
compared to, for example, mammalian viruses.
University of Kentucky