Plant hormone discovery may transform global food production

Plants fight disease every day, but that fight often comes at a cost. When a plant turns on its immune system, growth usually slows down. For farmers who depend on strong, healthy crops, this trade-off can mean lower food production

Now, researchers at Colorado State University have found a way to help plants stay protected without sacrificing growth. This discovery could shape the future of global food production

PLANTS GET SICK TOO

Plants have a defense system, just like people do. When insects attack or a disease infects a plant, the plant quickly turns on its protection system. To fight the threat, it releases certain hormones that help it survive

But there is a catch. When the plant focuses on protecting itself, it invests less energy into growing. It is similar to how a person might feel weak or tired while fighting an illness.

Food crops like wheat, corn, and soybeans need to keep growing steadily to produce a large harvest.

If growth slows down because the plant is busy fighting disease, the amount of food it produces can decrease – affecting the overall food supply

PLANTS BALANCING IMMUNE SYSTEM 

Scientists at Colorado State University studied how plants balance growth and defense

The research team, led by Professor Cris Argueso, focused on changing how plant hormones behave during stress.

When disease threatens a plant, certain hormones increase to fight infection. At the same time, growth hormones decrease. This internal struggle creates what scientists call a growth-defense trade-off.

Finding the off switch

To study this process, researchers used the small model plant Arabidopsis thaliana, also known as thale cress. This plant belongs to the mustard family and is widely used in plant research because scientists understand its biology very well.

The team worked with plants that had an autoimmune mutation. This mutation kept the immune system active all the time, similar to autoimmune disorders in humans. As a result, the plants struggled to grow.

The team worked with plants that had an autoimmune mutation. This mutation kept the immune system active all the time, similar to autoimmune disorders in humans. As a result, the plants struggled to grow.

By carefully adjusting hormone levels, the scientists restarted growth without weakening disease resistance. In fact, the modified plants showed even stronger resistance to disease.

“Only time will tell once it’s integrated into crops what effect this will have, but it does have the potential to be as big of a breakthrough as the Green Revolution 60 years ago in terms of food security,” said Argueso.

The Green Revolution

Around 60 years ago, a major change in farming called the Green Revolution began. The Green Revolution was a period when scientists developed new high-yielding crop varieties and modern farming methods to increase food production around the world

One of the key scientists behind this movement was geneticist and plant pathologist Norman Borlaug. He discovered a natural mutation in wheat that allowed the plant to produce much more grain than traditional varieties.

Farmers in many countries began planting this improved wheat. Food production increased greatly, and many nations were able to avoid famine. Because of this important work, Borlaug received the Nobel Peace Prize.

However, the Green Revolution also had drawbacks. To support these high-yielding crops, farmers often used large amounts of chemical fertilizers and pesticides. Over time, heavy chemical use caused environmental damage in several regions

Supporting more sustainable farming

Argueso and her team hope to support what could become a cleaner, more sustainable improvement in farming.

If crops resist disease naturally while maintaining strong growth, farmers may use fewer chemicals and less fertilizer.

“We want to create crop plants that can defend really well against pathogens but don’t have a yield penalty, which is the dream for farmers,” Argueso said. “We joke that this is the ‘green’ Green Revolution.”

Plants immune system has a brain

Plants respond to their environment through hormones called phytohormones. Argueso describes this system as the plant’s “chemical brain.” These hormones control growth, development, and defense

One important group of hormones is called cytokinins, which control cell division and help plants grow. When a plant detects disease, cytokinin levels drop. This shift allows the plant to focus energy on defense instead of growth.

In the study, scientists restored cytokinin levels in plants with overactive immune systems. Growth resumed, and disease resistance remained strong.

Instead of searching for and changing many individual genes, the researchers focused on balancing chemical signals inside the plant.

Argueso compares the strategy to a doctor prescribing medicine to fix a chemical imbalance. This method works faster and requires fewer changes than traditional genetic approaches that involve mapping the entire genome

From the lab to farms

The next step involves applying this discovery to major food crops such as wheat, corn, and soybeans.

If successful, farmers could grow crops that maintain high yields while resisting disease naturally. This improvement could reduce dependence on chemical treatments.

The team is exploring partnerships with breeding programs around the world to test these mutations in different climates and regions.

“We are exploring collaborations with breeding programs across the world, so this can be tested in different regions with all sorts of crops,” Argueso said. “If these mutations have the potential that we think they do, we would like them to be used everywhere."

Unlocking the immune secrets of plants

This study also shows how a student grew into a successful scientist at Colorado State University. The National Science Foundation funded the research, and Grace Johnston led the project.

Johnston first joined Cris Argueso’s lab as an undergraduate biology student. At that time, she was still figuring out what she wanted to study. As she learned more about plants, her interest grew stronger.

She decided to continue the research in graduate school and later wrote the scientific paper as her master’s thesis. Today, Johnston works as a research associate in the same lab.

“I did not know I wanted to do plant science,” said Johnston, who credits Argueso’s mentoring for her achievement and love of plant biology. “By the time I was done with my undergrad degree, we still didn’t know enough about these plants, and I just couldn’t let it go.”

This research shows that learning how plant hormones work can lead to real solutions for farming. With more testing and teamwork around the world, this discovery could help grow more food while also protecting the environment

Via earth.com