Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (218.0 KB bytes)

Title: Occurrence of shortleaf x loblolly pine hybrids in shortleaf pine orchards: Implications for ecosystem restoration

Author: Stewart, John F.; Will, Rodney; Crane, Barbara S.; Nelson, C. Dana;

Date: 2016

Source: Forest Science

Publication Series: Scientific Journal (JRNL)

Description: Shortleaf pine (Pinus echinata Mill.) is an important conifer in much of the southeastern United States. However, the species and its associated ecosystems are in decline, and recent evidence about hybridization with loblolly pine (Pinus taeda L.) raises concerns that the species may be at risk of further losses due to introgression. Although shortleaf pine is not widely planted for timber production, the US Department of Agriculture (USDA) Forest Service, state forestry agencies, some conservation organizations, and private landowners use artificial regeneration to regenerate shortleaf pine for various purposes including restoration of shortleaf pine-dominated ecosystems. Given the threat of introgression with loblolly pine, we tested federal and state shortleaf pine seed orchard trees (i.e., grafted clones) and wind-pollinated seedlings (from various nurseries sourced from several of the tested orchards) for hybrid character, using a previously developed microsatellite DNA test. We found that 8 to 10% of the USDA Forest Service orchard clones and 0 to 10% of state agency clones genetically resembled F1 hybrids or first-generation backcrosses to shortleaf pine (SLBC1). Frequencies of hybrid classifications in seedlings were generally similar to those of their seed orchard parent trees (0 –10%), although seedlings from the Oklahoma Forestry Services ursery contained an unusually high proportion of apparent F1 hybrids (4%), possibly due to the proximity of a loblolly pine seed orchard and loblolly pine plantations to the shortleaf pine seed orchard of origin. Based on these results, we recommend that shortleaf pine seed orchard managers consider steps to mitigate the genetic impact of trees classified as either F1 or SLBC1 hybrids to maintain the genetic integrity and desired phenotypic traits (i.e., fire, drought, and ice tolerance) of their shortleaf pine seeds, ensuring survival and adaptation of the species and its ecosystem to future climate variation.

Keywords: shortleaf pine, loblolly pine, introgression, microsatellites, artificial regeneration

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Stewart, John F.; Will, Rodney; Crane, Barbara S.; Nelson, C. Dana 2016.Occurrence of shortleaf x loblolly pine hybrids in shortleaf pine orchards: Implications for ecosystem restoration. Forest Science 62 . 7 p. https://doi.org/10.5849/forsci.15-167.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.