Tropical Trees Survive Drought by Breathing at Night
Scientists discovered that some tropical trees evolved a clever survival strategy: they take in carbon dioxide at night instead of during the day, keeping their pores closed during hot daytime to conserve water.
Discovery of Nocturnal CO₂ Intake
Researchers have uncovered a remarkable adaptation in tropical trees that allows them to survive periods of severe drought. By studying three species of Clusia trees, scientists found that these plants have evolved an unconventional approach to photosynthesis: they absorb carbon dioxide exclusively at night, a process known as CAM (Crassulacean Acid Metabolism) photosynthesis.
How It Works
During the scorching daytime hours when water loss would be catastrophic, these trees keep their stomata (pores) tightly closed. This prevents the escape of precious water vapor into the hot, dry air. Instead, they open their pores only at night when temperatures are cooler and humidity is higher, safely drawing in CO₂ without risking dehydration. The absorbed carbon dioxide is then stored and processed the following day when sunlight returns.
Survival Strategy Against Drought
This nighttime breathing mechanism provides a significant survival advantage in arid conditions. As climate change intensifies droughts across tropical regions, this adaptation becomes increasingly valuable. The research demonstrates nature's flexibility in evolving solutions to environmental stress. Plants that have mastered this nocturnal strategy can maintain photosynthesis and growth even when water becomes extremely scarce.
Why It Matters
Understanding how these trees cope with drought stress has broader implications for forestry, agriculture, and ecosystem conservation. As global temperatures rise and water scarcity becomes more prevalent, studying these natural adaptations could inform efforts to develop more drought-resilient crop varieties or predict how tropical forests will respond to future climate conditions.