Plants use signals normally associated with animals when they encounter stress despite not having a nervous system, according to a recent study. 

Researchers at the University of Adelaide found that plants respond to their environment with a similar combination of chemical and electrical responses to animals, but through machinery that is specific to plants.

"We've known for a long-time that the animal neurotransmitter GABA (gamma-aminobutyric acid) is produced by plants under stress, for example when they encounter drought, salinity, viruses, acidic soils or extreme temperatures," Associate Professor Matthew Gilliham, senior author of the study, said in a statement."But it was not known whether GABA was a signal in plants. We've discovered that plants bind GABA in a similar way to animals, resulting in electrical signals that ultimately regulate plant growth when a plant is exposed to a stressful environment."

By identifying how plants respond to GABA the researchers are optimistic that they have opened up many new possibilities for modifying how plants respond to stress.

"The major stresses agricultural crops face like pathogens and poor environmental conditions account for most yield losses around the planet -- and consequently food shortages," said Professor Stephen Tyerman, co-lead author of the study. "By identifying how plants use GABA as a stress signal we have a new tool to help in the global effort to breed more stress resilient crops to fight food insecurity."

Despite a similar function, the proteins that bind GABA and their mammalian counterparts only resemble each other in the region where they interact with the neurotransmitter -- the rest of the protein looks quite different.

"This raises very interesting questions about how GABA has been recruited as a messenger in both plant and animal kingdoms," researcher Dr. Sunita Ramesh said in a statement. "It seems likely that this has evolved in both kingdoms separately."

The researchers say these findings could also explain why particular plant-derived drugs used as sedatives and anti-epileptics work in humans.

The findings are detailed in the journal Nature Communications.