Thoughts from the President

June 13, 2025 - Stressing Over the Temperature

Dear Danforth Center Community,

When visitors come to the Danforth Center, I often point to our prairie landscape to illustrate an important point: those plants thrive, year after year, despite no irrigation water, no pesticides, and no fertilizers. If we can understand how those native prairie plants have adapted to the stresses of temperature extremes, drought, pests and diseases, we can apply that knowledge to improve the resilience of agricultural crops. With five review articles, the June 12, 2025 issue of Science (pp. 1146-1173) focuses on the challenge of understanding mechanisms underlying heat stress adaptation in plants, and the needs to quickly apply that knowledge to safeguard crop productivity in a warming world.

The articles cover a lot of ground, but I draw your attention to three themes concerning heat stress on plants:

It’s a difficult problem to understand. Much work has focused on the molecular details of stress responses in model plants, like Arabidopsis, and in a few major crops. But what we’ve learned does not always scale to understand how plants in agricultural and complex ecosystems cope with heat stress. Also, while it is clear that can plants evolve and adapt in heat-stressed environments over long periods of time, different plant species do these in very different ways. That means improving heat stress tolerance in different crops will likely require diverse approaches.

Heat stress affects the plant microbiome. Plant microbiomes are greatly affected by heat stress. In one study, the abundance of beneficial mycorrhizal fungi, which help plants take up nutrients from soil, was decreased by 59% at elevated temperatures. In contrast, several types of disease-causing bacteria and fungi grow better and become bigger problems at high temperatures. In other words, rising temperatures mean that crop-microbe interactions become less suited for productive agriculture.

Heat stress affects photosynthesis. As an insightful person said recently, “Plants feed the world and the sun feeds the plants.” Photosynthesis, the mechanism whereby green plants capture energy from the sun, is inhibited as temperatures rise above 40C. Research points the way towards developing plants with more resilient photosynthetic mechanisms at high temperatures.  Safeguarding photosynthesis through new crop traits may be necessary in the near future.

With the goal of mitigating the worsening effects of rising temperatures, the Danforth Center has considerable ongoing research in these areas. It is important work that’s needed for a food-secure future.

Jim Carrington,
President and Chief Executive Officer

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