Billions of American chestnuts once grew in our forests. Could DNA help bring them back?

The American chestnut was once one of the most important trees in eastern U.S. forests. It provided abundant nuts for wildlife and people and supplied strong, rot-resistant wood for homes, fences and furniture.

Then, more than a century ago, an invasive fungus called chestnut blight began killing the trees. Within decades, billions of American chestnuts had disappeared from the forests, changing the landscape and leaving the species nearly lost in the wild.

Now, scientists are working on a new way to bring the American chestnut back.

In this episode, we look at new research showing how genetic breeding could help scientists identify blight-resistant trees much faster. The approach could speed up efforts to restore the American chestnut while preserving the traits that made it such an important forest tree.

Could the American chestnut return to eastern forests within our lifetime? Researchers believe the latest advances give that long-running restoration effort a better chance.

Listen to learn what happened to this once-common tree—and why scientists now have renewed hope for its future.

 The written article is available on my website here: ruththornton.com.

 

Key points:

0:31- American chestnuts once dominated forests in the eastern U.S.

1:51 - Why care about American chestnuts?

2:30 - Chestnut blight arrives in North America in the late 1800s

3:47 - Using genetic data to speed up breeding

4:23 - Could purely native trees be bred to be resistant?

5:22 - What the future holds

 

Links to resources:

-       Westbrook et al., 2026: Genomic advances to accelerate American chestnut restoration. Science, 391(6786): 730-735.

-       The American Chestnut Foundation: History of the American chestnut tree.

-       State University of New York: Chestnut blight.

Harvard University’s Arnold Arboretum:Did American chestnut really dominate the Eastern Forest?

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