SELF-REPAIRING PLANTS?

Molecule may boost a crop’s ability to respond to injury and pests

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University of Missouri plant science researchers have found a receptor in plants that could be a vital component in the way plants respond to danger, including pests, environmental changes and plant wounds. This discovery may lead to herbicides, fertilizers and insect repellants that naturally work with plants to make them stronger.

The researchers are focusing on the molecule adenosine triphosphate (ATP). ATP is the main energy source inside a cell and is considered to be the high energy molecule that drives all life processes in animals and humans. Outside the cell, membrane receptors that attract ATP drive muscle control, neurotransmission, inflammation and development.

“Plants don’t have ears to hear, fingers to feel or eyes to see,” said Gary Stacey, professor of plant sciences in the College of Agriculture, Food and Natural Resources. “Plants use these chemical signals to determine if they are being preyed upon or if an environmental change is occurring that could be detrimental to the plant. We have evidence that when ATP is outside of the cell it is probably a central signal that controls the plant’s ability to respond to a whole variety of stresses.”

Stacey and fellow researchers, graduate student Jeongmin Choi and postdoctoral fellow Kiwamu Tanaka, screened 50,000 plants over two years to identify the ATP receptors. By isolating a key gene in the remaining plants, scientists found the receptor that aids in plant development and helps repair a plant during major events.

“We believe that when a plant is wounded, ATP is released into the wound and triggers the gene expressions necessary for repair,” Stacey said. “We think ATP is central to this kind of wound response and probably plays a role in development and a whole host of other plant responses to environmental changes and pests. We believe that with further study, researchers may be able to identify ways to naturally work with a plant’s own processes to protect it from major environmental events, plant wounds and insects.”

Future research will focus on how this receptor works with ATP, its protein structure, how it reacts to pests and how it may signal growth. The study, “Extracellular ATP signaling in plants,” was published in Science, and includes research from Sang Yeol Lee with the Plant Molecular Biology & Biotechnology Research Center, Gyeongsang National University in Korea. The study was funded in part by grants from the U.S. Department of Energy – Basic Energy Sciences and the Republic of Korea.