Carnivorous plant packs big wonders into tiny genome

Great, wonderful, wacky things can come in small genomic packages.

That's one lesson to be learned from the carnivorous bladderwort, a plant whose tiny genome turns out to be a jewel box full of evolutionary treasures.

Called Utricularia gibba by scientists, the bladderwort is a marvel of nature. It lives in an aquatic environment. It has no recognizable roots. It boasts floating, thread-like branches, along with miniature traps that use vacuum pressure to capture prey.

A new study in the scientific journal Molecular Biology and Evolution breaks down the plant's genetic makeup, and finds a fascinating story.

According to the research, the bladderwort houses more genes than several well-known plant species, such as grape, coffee or papaya -- despite having a much smaller genome.

This incredibly compact architecture results from a history of "rampant" DNA deletion in which the plant added and then eliminated genetic material at a very fast pace, says University at Buffalo Professor of Biological Sciences Victor Albert, who led the study.

"The story is that we can see that throughout its history, the bladderwort has habitually gained and shed oodles of DNA," he says.

"With a shrunken genome," he adds, "we might expect to see what I would call a minimal DNA complement: a plant that has relatively few genes -- only the ones needed to make a simple plant. But that's not what we see."

A unique and elaborate genetic architecture

In contrast to the minimalist plant theory, Albert and his colleagues found that U. gibba has more genes than some plants with larger genomes, including grape, as already noted, and Arabidopsis, a commonly studied flower.

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Carnivorous plant packs big wonders into tiny genome