On August 6, 1945, the detonation of the atomic bomb 'Little Boy' over Hiroshima destroyed nearly everything within a one-mile radius, leaving behind intense heat, shockwaves, and deadly ionizing radiation. Among the devastation, six Ginkgo biloba trees standing between 1,100 and 2,200 meters from the hypocenter suffered charring and total leaf loss, but miraculously survived. What makes the Ginkgo biloba extraordinarily resilient to extreme environmental stresses, including nuclear radiation?
The answer lies in millions of years of evolutionary adaptations. As a living fossil that has remained largely unchanged for over 200 million years, Ginkgo biloba survived the mass extinction that wiped out the dinosaurs. Its secret weapon is a complex defense mechanism powered by unique chemical compounds called ginkgolides and bilobalides, alongside potent antioxidants.
When subjected to ionizing radiation, which causes severe cellular and DNA damage through oxidative stress, the Ginkgo's high concentrations of radioprotective flavonoids effectively neutralize free radicals. Furthermore, the tree possesses remarkable compartmentalization abilities. Even if its outer bark and trunk suffer heavy radiation damage or burning, its deeply buried root system and meristematic tissues remain sheltered and intact.
Shortly after the bombing, these hibernating cells triggered rapid cellular repair and secondary growth, allowing the trees to sprout green shoots by the spring of 1946. Today, these six trees, known in Japan as Hibakujoku or A-bombed trees, continue to bloom in Hiroshima. They stand as living testaments to botanical resilience, serving as vital subjects for scientists studying radioprotection, cellular repair mechanisms, and plant longevity in extreme environments.