Displaying items by tag: University of Tennessee Agricultural Institute

This white oak (Quercus alba) in Burlington, N.J. is known as the Keeler Oak. It is an estimated 300 years old and is emblematic of the role these massive trees can play in the forest and beyond. The white oak is a highly valuable tree, both economically and ecologically. Its seedling survival rate is declining, but University of Tennessee researchers joined others to map the species’ DNA.  Wikipedia Commons

New research involving University of Tennessee describes the genome of the mighty white oak

Patricia McDaniels is news and information manager for the University of Tennessee Institute of Agriculture.

KNOXVILLE — Highly valued economically, ecologically and culturally, the white oak (Quercus alba) is a keystone forest species and is one of the most abundant trees across much of eastern North America. It also faces declining seedling recruitment in many parts of its range.

In a paper published in New Phytologist, researchers representing the University of Tennessee Institute of Agriculture, Indiana University, the University of Kentucky, the U.S. Forest Service and several more institutions described for the first time the species’ complex genome, providing insights into fundamental questions about plant evolution, tree breeding and genetic improvement efforts that could help forest managers plan for and address future forest resources.

Lead authors of the paper Meg Staton, associate professor of bioinformatics and computational genomics in the UT Department of Entomology and Plant Pathology, and Drew Larson, National Science Foundation postdoctoral fellow at Indiana University, coordinated with colleagues across the nation in academia, the U.S. Forest Service, state forests and industry to obtain genetic sequence data representative of the species.

Also central to the effort were Seth DeBolt, professor of horticulture and director of the James B. Beam Institute for Kentucky Spirits at the University of Kentucky, and Dana Nelson of the U.S. Forest Service Southern Research Station and director of the Forest Health Research and Education Center at the University of Kentucky.

White oak barrels are lifeblood to the bourbon industry because the color and much of the whiskey’s flavor derive from the charred wood in which it is aged.

The 2024 National Champion Tree Register features the largest documented trees across the U.S. such as the National Champion Sitka Spruce, which people can see in Olympic National Park in Washington.  Brian Kelley via American Forests

Beginning in February, citizen scientists and others can help catalog our biggest trees

Katie Donaldson is a communications specialist for the University of Tennessee School of Natural Resources.

The original story continues below.

KNOXVILLE — The National Champion Tree Program (NCTP) will take nominations for new Champion Trees on its website starting Feb. 28. The list of eligible tree species for the 2025-2026 register includes more than 1,200 species of trees native and naturalized to the U.S., a steep increase from the 900 species eligible for the 2024 register. It is available online in the Register of Champion Trees. Nominations for potential Champions will stay open through August 2025.

“Each year, people find ‘new’ Champions all over the country,” said Jaq Payne, NCTP director. “It could be the tree in your backyard, the tree in front of your church or the tree in one of your local parks or state forests.” For the first time in the program’s 84-year history, an additional list of “culturally important non-native” eligible species will be included to represent common, widely recognized urban species previously not found on the register.

Champion Trees are identified based on a point system including the trunk circumference, height and average crown spread. After members of the public nominate trees, the NCTP will work with state coordinators to verify the submissions and their measurements. Verified trees will be added to the program’s data management system. National Champion Trees are crowned once every two years and must be re-verified every 10 years.

Tennessee Tree Improvement Program director Scott Schlarbaum stands among a collection of grafted and cloned native trees at the program’s grafting facility off Alcoa Highway. Thomas Fraser/Hellbender Press

2-minute video on hemlock genetic diversity conservation added to this article on September 2, 2021

UT Tree Improvement Program prepares for its greatest grafting season yet

“What you have here is the future of Tennessee forests,” said Scott Schlarbaum, a professor and director of the University of Tennessee Tree Improvement Program.

You can tell from a chuckle he thinks his statement might sound hyperbolic and a bit dramatic, but it’s really not.

He gestured across an unassuming but important UT facility just off Alcoa Highway tucked within the East Tennessee AgResearch and Education Center that will be the main base for a historic tree-grafting effort that will commence this winter. 

The goal: Create trees with high-quality genetic traits ranging from wildlife and habitat qualities to timber value.

Heavy traffic hissed down the nearby highway as it passed by the modest understock yard, greenhouse, raised beds and small house containing offices used as the main grafting facility for the UT Tree Improvement Program (TIP). At least 50,000 vehicles pass by the site every day but most drivers and passengers are oblivious to the existence of this small but important outpost of forest conservation skirted by a Knox County greenway.

The Tree Improvement Program was first established in 1959. It survives as a notable exception to the cost-cutting of such projects in other states at both university and government levels.

“These days we tend to look only at the short term. UT did not.”

Beginning in January, Schlarbaum, director of the program since 1983, will oversee grafting efforts on some 3,600 trees. Last year, during which TIP efforts were disrupted by the Covid-19 pandemic, about 2,000 trees were grafted.

“We are gearing up for our biggest grafting year ever. That’s a huge deal,” Schlarbaum said.

A life dedicated to the flora of Tennessee

Dr. Hal DeSelm clambered around the crest of Cherokee Bluff in the heat of a late Knoxville summer 22 years ago. The Tennessee River flowed languidly some 500 feet below. Beyond the river stood the campus of the University of Tennessee Agriculture Institute. The towers of the city center rose to the northeast beyond the bridges of the old frontier river town.

DeSelm was not interested in the views of the urban landscape below. He was interested in the native trees, shrubs, herbs and grasses that clung to the ancient cliffside with firm but ultimately ephemeral grips on the craggy soil.

The retired UT professor, a renowned ecologist and botanist who died in 2011, had been sampling the terrestrial flora of Tennessee for decades. The life-long project took on a new urgency in the early 1990s, when he accelerated his data collection in hopes of writing the authoritative guide to the natural vegetation native to the forests, barrens, bogs and prairies of pre-European Tennessee.

Between 1993 and 2002, DeSelm collected 4,184 data points from 3,657 plots across the state. Many of those plots have since been lost to development, highways, and agriculture, or overrun by exotic species, but he assembled an invaluable baseline of the native landscape. Many of the sites he recorded have since been lost to development.