A New Rice Gene Could Mean Less Planting, More Growing — But There's a Catch

Rice feeds more than half the planet. It’s the quiet hero of countless meals, providing a whopping 20% of daily calories for many.

But there’s a catch: the rice we eat is an annual crop. Farmers have to replant it every single year. Wild rice, on the other hand, is a bit more chill. It’s perennial, meaning it just keeps growing new shoots, year after year, no replanting required.

The Perennial Puzzle Solved (Mostly)

Researchers, naturally, wanted to know wild rice’s secret. They honed in on Oryza rufipogon, a wild relative, and found two genes that basically tell the plant, "Hey, keep on regrowing!" They then took these genes and popped them into cultivated rice (Oryza sativa), creating a new strain that behaves much like its wild ancestors.

It turns out, the rice we eat today likely came from perennial stock. But somewhere along the line, as humans started farming it intensively, rice decided annual was the way to go, losing its ability to just… keep going. Because apparently, that's where we are now.

Geneticist Bin Han and his team scoured 446 wild rice samples, comparing them to cultivated types. They zeroed in on a specific spot on chromosome 1, which they cleverly named Endless Branches and Tillers 1 (EBT1). This EBT1 region is home to two copies of a gene called microRNA156 (B and C).

When a rice plant is young, these genes are super active, keeping the plant in a perpetual juvenile growth state. As it ages, their activity slows. But in wild rice, this region essentially "resets" after flowering, allowing the plant to keep growing instead of kicking the bucket. To prove it, they crossed wild rice with cultivated rice and found a hybrid, G43, that could stop flowering and just start growing new shoots again.

And grow it did. A normal rice plant taps out at around 10 tillers (those secondary shoots that branch from the base). G43? Over 70 tillers. Let that satisfying number sink in.

The Catch: More Tillers, Fewer Seeds?

Here’s the rub: those impressive tillers on G43 are sterile. They produce abnormal flowers with no seeds. The researchers suspect they’ll need to add even more genes to get fully fertile perennial rice.

Plant geneticist Salomé Prat points out that EBT1 also stops flowering, which can actually lower the yield. In wild rice, this gene reactivates after flowering, allowing new tillers to form. It’s a delicate balance.

So, don't expect perennial rice in your local supermarket anytime soon. Plant biologist Jorge Dubcovsky notes that perennial plants often produce less than annuals. And with a growing global population, he argues, we can't afford to switch to less productive crops, no matter how ecologically beneficial they might be. Which, if you think about it, is both impressive and slightly terrifying.