Iconic chestnut tree poised for comeback
Scientists are building a better chestnut that should be able to resist blights like the fungus that killed off most of the trees a century ago.
Mon, Apr 16, 2012 at 02:20 PM
Once plentiful, the American chestnut tree has largely disappeared, killed off by a deadly fungus that began felling the trees 100 years ago.
This month, researchers from the SUNY College of Environmental Science and Forestry (ESF) in Syracuse, N.Y., are planning to plant 10 chestnut trees with a tweaked gene that they believe will help the trees stave off the pathogen that brought their ruin.
William Powell, a plant biotechnology expert at ESF, and his colleague Charles Maynard, have incorporated a gene into the test trees that they derived from a breed of wheat. The gene has been shown to increase resistance in hybrid poplar trees to fungal pathogens.
The American chestnut tree was once a dominant species in the forests of the eastern United States; it accounted for 25 percent of the trees in the forest. A healthy chestnut tree can grow more than 100 feet (30 meters) tall and measure 10 feet (3 meters) in diameter.
Not only do the trees produce chestnuts — great for feeding wildlife and humans alike — but their wood is rot-resistant and fast-growing, Powell said, which was important for the lumber industry.
"We really want to bring [the chestnut] back. The only way it can come back is to make a resistant tree, because no one has been able to control the blight any other way," Powell said in a statement.
The hybrid chestnut trees are slated to be planted at a test site in the New York Botanical Garden in the Bronx on April 18. The location is significant.
"That's a stone's throw — literally across the street — from where the blight was discovered in 1904," Maynard said in a statement.
The trees slated to be planted in the Botanical Garden are among more than 100 varieties of transgenic American chestnuts that are being tested in field trials or waiting to be tested for blight resistance.
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