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ARS Home » Northeast Area » Kearneysville, West Virginia » Appalachian Fruit Research Laboratory » Innovative Fruit Production, Improvement and Protection » People » Ann Callahan

Ann M Callahan



Dr. Ann M. Callahan
Research Geneticist
Phone: (304)725-3451 ext 356
FAX: (304) 728-2340

Room 210
Appalachian Fruit Research Station
2217 Wiltshire Road
Kearneysville, WV 25430-2217

Curriculum Vitae

Education and Degrees

1980 Ph.D.  Developmental GeneticsUniversity of Virginia, Regulation of Sexual Development
                     in Volvox carteri, Robert Huskey, Advisor.

1974 A.B. Biology. Indiana University, Bloomington, IN


1989- Present

Research Geneticist, USDA-ARS, Appalachian Fruit Research Station, Kearneysville, WV 25430.Developing and utilizing molecular tools to improve breeding for fruit traits (Prunus and other temperate perennial fruit).


Research Associate, Plant Science Department, West Virginia University, Appalachian Fruit Research Station (Kearneysville). Molecular biology of fruit ripening (tomato).


Postdoctoral Fellow, University of Utah (Salt Lake). Bacterial Chemotaxis,-Threonine Serine Receptor (TSR) Sandy Parkinson, Advisor.

Laboratory Personnel 

Dan Bullock
Kelsey Galimba

Callahan Laboratory Publications

Google Scholar:

Research Gate:

 Current Projects

Text Box: Left-Peach was stained to show stone cells turning red prior to hardening to become a stone.
Right-Plum was stained to show stone cells turning blue depending on how much lignin they produced.

Stone formation in Prunus--How are stones formed in Prunus and is it possible to manipulate gene expression to prevent the stone hardening?


AFRS Field Day_WIL6488_WHWe have planted several dText Box: Along with Chris Dardick, demonstrating the process of stone hardening in wild type fruit and the so- called ‘Pitless’ plums that were remnants from Luther Burbank’s breeding program in the early 1900s.ifferent plum trees (Prunus domestica, prune plums) that came from Luther Burbank’s breeding program from 1900, that have almost no stone. We are using these as breeding material to improve as well as experimental material to determine what the mutation is that prevents stone tissue from being formed.

In addition we have identified genes involved in the process and have genetically engineered plum trees to test if by manipulating those genes there is an effect on the stone formation. These could then be targets for selective breeding.