Taq writes:
So the real test for those who argue that junk DNA has important function is to explain why the bladderwort genome can work so well with almost all of the junk DNA removed.
Just a guess...perhaps the junk DNA helps minimize the effect on the next generation from viral infections of the reproductive cells.
More places for the virus to intrude on the DNA without corrupting coding genes could be an advantage for a species.
Obviously, I am not a biologist. So, I don't know how a bladderwort reproduces or if that method of reproduction is more or less susceptible to being affected by viral infections than vertebrates or onions.
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