Here's how plants became meat eaters

Carnivorous plants like Venus flytraps have evolved to be skillful hunters.

(Image credit: Kuttelvaserova Stuchelova/Shutterstock)

About 70 million years ago, when dinosaurs roamed the Earth, a genetic anomaly allowed some plants to turn into meat eaters. This was done in part, with a stealthy trick: repurposing genes meant for their roots and leaves and using them instead to catch prey, a new study finds.

This step is one of three that some non-carnivorous plants took over tens of millions of years to allow them to turn into hungry carnivores, the researchers said.

One plant is the familiar Venus flytrap (Dionaea muscipula), a native to the wetlands of the Carolinas that has influenced Pokémon characters, made appearances in various Saturday morning cartoons, and even inspired a Broadway play. The closely related aquatic waterwheel plant (Aldrovanda vesiculosa) occupies the waters of almost every continent. It has spindly underwater flaps that quickly tighten around unsuspecting marine animals. The third plant investigated, the beautiful but deadly sundew plant (Drosera spatulata), is common in Australia. Luring victims with sweetness, the sundew rolls up a sticky strip around its catch.

After analyzing these plants, the team discovered the three-step process toward carnivory. First, about 70 million years ago, an early non-carnivorous ancestor of the three modern plant carnivores underwent a whole-genome duplication, generating a second copy of its entire DNA, or genome. This duplication freed up one of the copies of leaf and root genes to diversify, allowing them to serve other functions. Some leaf genes developed into genes for traps, while carnivorous nutrition and absorption processes were guided by genes that otherwise would have served roots seeking nutrition from soil.

The second step in their journey to carnivory occurred once the plants began receiving new nutrients from prey. At that point, traditional leaves and roots were no longer as necessary. Many genes that were not involved in carnivorous nutrition began to disappear. For instance, seedlings of aquatic waterwheel plants acquire an early proto-root, but it fails to develop as they mature. This is the only remnant of what once was a root system. As a result of losing this gene and others, the three plants observed in this study are the gene-poorest plants to be sequenced to date, the researchers stated.

Two earlier studies by other groups of scientists in 2013 showed similar gene-poor findings in other carnivorous plants. They found that an aquatic bladderwort thriving on all continents but Antarctica and a corkscrew ground-covering plant native to Brazil both had very small genomes compared with non-carnivorous plants. These carnivores may also have undergone the same gene-shedding process, the researchers of the new study said.

In the third step of the transformation to carnivory, the plants underwent evolutionary changes specific to their environment. The roots and leaves evolved to be trap-specific, the researchers found. Genes for roots that were once used to seek out and absorb nutrients from soil were now commandeered to create enzymes needed to digest and absorb nutrients from prey. Genes once used in glands that secreted nectar to attract pollinating insects were summoned to traps, where they produce substances to attract prey.

Diane Lincoln is the author of "Science Discovery Files," a non-fiction science book published by World Scientific. She is a former science teacher, with two decades of

experience bringing fascinating science stories to life for her students. She holds a Doctorate in Education and has taught graduate-level courses in science education to

teachers wanting to hone their skills. She has written for online media outlets such as Live Science and Science News for Students. Diane has won awards for her fictional

stories and poetry in print media, and she has published a book of poetry.