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Abstract Detail



Systematics

WHITTEMORE, ALAN THOMAS [1], Campbell, Julian [2], Atha, Daniel [3].

Ploidy variation in eastern North American Fraxinus .

The destruction of native Fraxinus (ash; Oleaceae) by an introduced insect (Emerald Ash Borer, Agrilus planipennis), is causing massive ecological dislocation in eastern North America. Efforts to conserve representative genetic diversity while long-term control measures are sought are currently hampered by taxonomic uncertainty in the genus. Polyploidy has been reported from Fraxinus subg. Melioides, which includes most of the species in eastern North America, and it has been suggested that this is allopolyploidy, suggesting that phylogeny in the group may be reticulate. However, other authors have debated the taxonomic significance of polyploidy in the group. Preliminary surveys of wild ash show ploidy variation within all of the eastern North American species complexes in subg. Melioides, and suggest that some controversial species pairs differ in ploidy level, suggesting that these segregates are valid. Flow cytometry will be important in improving the delimitation of Fraxinus species and understanding their relationships, which in turn will be important in conserving genetic material in the face of continued destruction by exotic borers.


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1 - UNITED STATES NATIONAL ARBORETUM, 3501 NEW YORK AVE NE, WASHINGTON, DC, 20002-1958, USA
2 - 3525 Willowood Road, Lexington, KY, 40517, USA
3 - New York Botanical Garden, Bronx, NY, USA

Keywords:
Fraxinus
Oleaceae
ash 
Polyploidy.

Presentation Type: Oral Paper
Session: 41, Systematics III: Euasterids
Location: Sundance 4/Omni Hotel
Date: Wednesday, June 28th, 2017
Time: 4:00 PM
Number: 41009
Abstract ID:194
Candidate for Awards:None


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