When the atomic bombs dropped on Hiroshima and Nagasaki in 1945, the devastation seemed unimaginable. Yet, against all odds, some trees in Hiroshima managed to survive the blast and regrow in the months following the attack. Scientists are now studying how these forest giants, including the famous hibakujumoku or “A-bombed trees,” endured such extreme conditions.
The bombings created an environment that was anything but hospitable to life. Temperatures reached over 3,000°C, and radiation levels were deadly. But despite this, certain like Ginkgo biloba and Japanese hackberry made an unexpected recovery. Researchers are now digging into how they survived the unimaginable, something experts once thought would take decades to happen.
A new study published in Progress in Biophysics and Molecular Biologysuggests that the key to the trees’ survival might not be their ability to evolve over generations, as we saw in places like Chernobyl, but rather their pre-existing survival strategies.
Trees that Defied Nuclear Bomb
In the center of Hiroshima, a few trees stand tall as symbols of the city’s survival and recovery. Known as hibakujumoku, these “A-bombed trees” have become a powerful reminder of resilience in the face of disaster. The Ginkgo biloba tree, one of the oldest species in the world, is particularly noteworthy. Despite being within the blast zone, several Ginkgo trees managed to survive, with new growth appearing shortly after the bombing.
As explained in Progress in Biophysics and Molecular Biologystudy, the survival of these trees can be attributed to their genetic traits, such as strong DNA repair mechanisms and protective features.
What makes these trees even more remarkable is that scientists originally predicted plant life would take decades to recover in Hiroshima. Yet, in just a few months, grass and trees began sprouting again. These hibakujumokuproved that nature’s ability to recover from disaster was much stronger than expected.
How Trees Survived the Radiation?
The secret to how they survived isn’t necessarily about adapting to the radiation over time. It’s about what scientists call “constitutive resilience,” meaning that these ones already had built-in mechanisms for survival.
“The atomic bombings of Hiroshima and Nagasaki in 1945 created a unique environment of acute, high-dose ionizing radiation,” explained the authors. “This stands in stark contrast to the chronic, low-dose rate contamination that defines the Chernobyl and Fukushima Exclusion Zones.”
This kind of resilience is important because it shows that certain plants can take on big environmental blows.
What Hiroshima’s Trees Teach Us About Tomorrow?
While we know that they survived the atomic bombing, scientists are now turning their attention to what these green survivors can teach us about survival on a deeper level.
“These trees are not merely historical relics; they are biological archives holding potential information on extreme radio-tolerance.” the authors added: “They represent an extremely small fraction of the pre-existing population that, by a combination of fortunate location, genetic predisposition, or protective microenvironment, withstood the cataclysm.”
The next step is to study their genetic makeup more closely. By looking at their DNA , researchers hope to uncover how specific genes help them tolerate extreme radiation and environmental stress.
“In an era of increasing anthropogenic pressure, integrating this pivotal historical case into the broader framework of environmental science provides…critical insights for predicting and fostering resilience in the future,” they concluded.
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