Genetic Structure of the Invasive TreeAilanthus altissimain Eastern United States Cities

Author:

Aldrich Preston R.1,Briguglio Joseph S.1,Kapadia Shyam N.1,Morker Minesh U.1,Rawal Ankit1,Kalra Preeti1,Huebner Cynthia D.2,Greer Gary K.3

Affiliation:

1. Department of Biological Sciences, Benedictine University, Lisle, IL 60532, USA

2. Northern Research Station, USDA Forest Service, 180 Canfield Street, Morgantown, WV 26505, USA

3. Biology Department, Grand Valley State University, 228 Henry Hall, 1 Campus Drive, Allendale, MI 49401, USA

Abstract

Ailanthus altissimais an invasive tree from Asia. It now occurs in most US states, and although primarily an urban weed, it has become a problem in forested areas especially in the eastern states. Little is known about its genetic structure. We explore its naturalized gene pool from 28 populations, mostly of the eastern US where infestations are especially severe. Five microsatellite markers were used to examine presumed neutral genetic variation. Results show a gene pool that is moderately diverse and sexually active and has significant but small genetic differences among populations and little correspondence between geographic and genetic distance. These findings are consistent with a model of multiple introductions followed by high rates of gene exchange between cities and regions. We propose movement along road and railway systems as the chief mode of range expansion.

Funder

U.S. Department of Agriculture

Publisher

Hindawi Limited

Subject

Plant Science

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