Geographically extensive hybridization between the forest trees American butternut and Japanese walnut

• Published in: Biology letters (2005)
• Main Authors: Sean M Hoban, Tim S McCleary, Jeanne Romero-Severson
• Format: Journal Article
• Language: English
• Published: The Royal Society
• ISSN: 1744-9561; 1744-957X
• DOI: 10.1098/rsbl.2009.0031

J. ailantifolia
as the maternal parent. This is, to our knowledge, the first genetic data supporting natural hybridization between these species. The long-term outcome of introgression could include loss of native diversity, but could also include transfer of useful traits from the introduced species.
and 22 advanced generation hybrids in seven locations across the eastern and southern range of the native species. Two locations show extensive admixture (95%
Carrière). Using nuclear and chloroplast DNA markers, we provide evidence for 29 F
Juglans ailantifolia
Juglans cinerea
L.) and the introduced Japanese walnut (
We investigate the question of naturally occurring interspecific hybrids between two forest trees: the native North American butternut (
and hybrids) while other locations show limited admixture. Hybridization appears to be asymmetrical with 90.9 per cent of hybrids having