That plant, Tidestromia oblongifolia, has helped Michigan State University scientists uncover how life can flourish in extreme heat, revealing a potential blueprint for engineering crops that can adapt to our changing climate.
In a new paper published in Current Biology, Research Foundation Professor Seung Yon "Sue" Rhee and Research Specialist Karine Prado report that T. oblongifolia grows faster in Death Valley's summer conditions by rapidly adjusting its photosynthetic system to withstand the heat.
"When we first brought these seeds back to the lab, we were fighting just to get them to grow," Prado said. "But once we managed to mimic Death Valley conditions in our growth chambers, they took off."
Working with colleagues from the Rhee lab at MSU's Plant Resilience Institute, Prado used custom-built plant growth chambers to recreate the intense light and temperature swings of a real Death Valley summer. What happened next stunned them: T. oblongifolia tripled its biomass in just 10 days. In contrast, closely related species often praised for their heat tolerance stopped growing altogether.
Within only two days of exposure to extreme heat, the plant raised its photosynthetic comfort zone, enabling it to keep producing energy. Within two weeks, its optimal photosynthetic temperature reached 45 degrees Celsius (113 degrees Fahrenheit), higher than any major crop species known.
"This is the most heat-tolerant plant ever documented," Rhee said. "Understanding how T. oblongifolia acclimates to heat gives us new strategies to help crops adapt to a warming planet."
Under Death Valley-like heat, the plant's mitochondria, its energy-producing organelles, reposition next to its chloroplasts, where photosynthesis takes place. The chloroplasts themselves change shape, forming distinctive "cup-like" structures never before seen in higher plants. These may help capture and recycle carbon dioxide more efficiently, stabilizing energy production under stress.
Meanwhile, thousands of genes switch their activity within 24 hours. Many are involved in protecting proteins, membranes, and photosynthetic machinery from heat damage. The plant also boosts production of a key enzyme called Rubisco activase, which may help keep photosynthesis running smoothly at high temperatures.
"T. oblongifolia shows us that plants have the capacity to adapt to extreme temperatures," Rhee said. "If we can learn how to replicate those mechanisms in crops, it could transform agriculture in a hotter world."
For decades, most plant biology has focused on model species that are easy to grow such as Arabidopsis or crop plants like rice and maize. But Rhee argues that extreme survivors like T. oblongifolia represent a new frontier for improving resilience.
"Desert plants have spent millions of years solving the challenges we're only beginning to face," she said. "We finally have the tools, such as genomics, high-resolution live imaging and systems biology, to learn from them. What we need now is broader support to pursue this kind of research."
Her lab is already putting those insights to work, exploring how the genes and cell structures that give T. oblongifolia its heat resilience could be harnessed to make staple crops more robust.
"This research doesn't just tell us how one desert plant beats the heat," Prado said. "It gives us a roadmap for how all plants might adapt to a changing climate."
Research Report:Photosynthetic acclimation is a key contributor to exponential growth of a desert plant in Death Valley summer
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