Has UC Riverside-led Team’s Discovery Found Hope for Crops Despite Frequently Occurring Drought?

By on November 8, 2019

Moving forward, has the game changed for farmers to keep plants plump and thriving in spite of droughts? A University of California (UC) Riverside-led team thinks they may have found one way to help plants hold onto water via a chemical discovery, which could result in thwarting the massive annual crop losses from drought and help farmers grow food despite a changing climate.

“Drought is the No. 1 cause, closely tied with flooding, of annual crop failures worldwide,” said Sean Cutler, a plant cell biology professor at UC Riverside, who led the research. “This chemical is an exciting new tool that could help farmers better manage crop performance when water levels are low.”

In 2013, Cutler’s team developed an anti-water-loss chemical called Quinabactin, was the first of its kind. The chemical mimics abscisic acid, or ABA, the natural hormone produced by plants in response to drought stress. ABA slows a plant’s growth, so it doesn’t consume more water than is available but also doesn’t wilt.

Quinabactin seemed to be a viable substitute for the natural hormone ABA, and companies have used it as the basis of much additional research, and have filed numerous patents based on it. But there was one problem – it did not work well for some important plants, such as wheat, the world’s most widely grown staple crop.

“Scientists have known for a long time that spraying plants with ABA can improve their drought tolerance,” Cutler said. “However, it is too unstable and expensive to be useful to most farmers.”

Cutler’s team searched millions of different hormone-mimicking molecules and, along with some chemical engineering, developed a newer, more effective anti-water-loss chemical they call, Opabactin, also known as “OP.” “OP” is also gamer slang for “overpowered,” referring to the best character or weapon in a game.

“The name is also a shoutout to my 10-year-old at home,” Cutler said.

OP is 10-times stronger than ABA, which makes it a “super hormone” and it works fast. Within hours, Cutler’s team found a measurable improvement in the amount of water plants released. And, because OP works so quickly, it could give growers more flexibility around how they deal with drought.

Details of the team’s work on the newer, more effective anti-water-loss chemical is described in a paper published in the Oct. 25 edition of Science. Initial funding for this project was provided by Syngenta, an agrochemical company, and the National Science Foundation.

“One thing we can do that plants can’t is predict the near future with reasonable accuracy,” Cutler said. “Two weeks out, if we think there’s a reasonable chance of drought, we have enough time to make decisions — like applying OP — that can improve crop yields.”

Cutler’s team is now trying to “nerf” their discovery. “That’s (also) gamer speak for when a weapon’s power is reduced,” Cutler said.

Whereas OP slows growth, the team now wants to find a molecule that will accelerate it. Such a molecule could be useful in controlled environments and indoor greenhouses where rainfall isn’t as big a factor.

“There’s times when you want to speed up growth and times when you want to slow it down,” Cutler said. “Our research is all about managing both of those needs.”