Whittemore, Alan .
Ploidy races in Ulmus americana.
American elm (Ulmus americana) is a widespread canopy tree of eastern North America. Once common in horticulture and in the wild, it has been heavily impacted by Dutch elm disease, caused by an Asian fungus. Long considered the sole tetraploid in the otherwise diploid genus Ulmus, U. americana includes both diploid and tetraploid populations, with tetraploids being more widespread. Diploids and tetraploids may co-occur in the same area, sometimes in the same stand. The genetic relationship between the two ploidy levels is being clarified by further investigation of the geographical distribution of different ploidies within and among stands, and investigation of plants of known ploidy using SSR markers.
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1 - UNITED STATES NATIONAL ARBORETUM, 3501 NEW YORK AVE NE, WASHINGTON, DC, 20002-1958, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell C/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 11:30 AM