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Whitehill Lab – Christmas Tree Genetics Program

The Christmas Tree Genetics program at NC State is working to advance North Carolina’s Christmas tree industry through the application of genetic and genomic principles.

North Carolina Fraser Fir

Fraser fir (Abies fraseri) is a conifer tree native to North Carolina’s Appalachian mountains and represents over ~98% of all Christmas tree species grown in North Carolina. According to the US Department of Agriculture, the majority of Christmas trees sold annually in the US belong to the fir genus (Abies spp.). 

Fraser fir is ideal as a Christmas tree due to its soft needles, lasting aroma, excellent post harvest needle retention, and sturdy yet flexible branches for hanging ornaments. North Carolina Fraser fir has been chosen for the official White House Christmas tree more than any other species: 14 times total.

North Carolina is ranked second in the nation in Christmas tree production, both in number of trees harvested and in cash receipts.

– NC Christmas Tree Association

Anticipating and Combating Challenges to Christmas Tree Production

Forest health threats such as pests, pathogens, and a changing climate present a challenge to Christmas tree production. To oppose these threats, it is important to understand tree survival and defense mechanisms. Tree resilience is defined as a tree’s ability to endure stress and survive. In contrast, tree resistance is a phenotypic description for a tree’s ability to actively resist attack despite significant pest pressure. 

These concepts are not mutually exclusive and are desirable characteristics for trees in a changing climate. Trees have the ability to adapt or migrate to new environments as long as environmental changes are not too rapid. However, increasing evidence suggests that overall global temperature is rising at an accelerated rate resulting in increased maladaptation of local conifer populations. 

Climate change coupled with increasing globalization pose serious problems to tree resources as pests adapt to and are introduced into new environments. Climate change is precipitating outbreaks of endemic and invasive insect and pathogen pests worldwide. These outbreaks result in serious ecological and economic losses to North American conifer forests. The Christmas Tree Genetics program at NC State is working to produce trees that are better suited to withstand climate and forest health related threats, and that are more desirable to consumers.

NC State University Christmas Tree Genetics Program: Our Goals

Our main research goal is the discovery of genes, mechanisms, and novel genotypes in Christmas tree species. Conifers utilize an array of defense mechanisms to resist attack. These mechanisms include constitutive (i.e. pre-formed) and induced chemical and physical systems that form an integrated defense syndrome to effectively stop attack from a pest. However, the use of genomic technologies to understand the genetic basis by which natural resilience mechanisms function in trees is virtually unexplored by the forest sector. Host tree genetic resilience/resistance has long been recognized as the ideal means to mitigate these pressures.