Large Surviving American Chestnuts (LSAs) have the potential to hold resistant genes to chestnut blight (Cryphonectria parasitica). In conjunction with a network of enthusiasts in other states we are working on breeding program to enhance resistance within pure American Chestnut genetics. This program is in the beginning phases. If you’re interested in being participating please get in touch.
The American Chestnut Foundation
Hybrids and backcross of AC and Chinese species. Well funded. Backcross strategy set back after genomic studies revealed resistance isn’t isolated in a few specific genes, but spread more broadly across the genome, making a back cross of high AC percentage unlikely to be resistant to blight. Recently developed Recurrent Genomic Selection (RGS) data driven breeding strategy for continued hybrid crosses.
American Chestnut Resoration/ SUNY ESF
Focus on genetic modification by inserting the oxalate acidase into the AC genome. Promising technology, however issues with heredity, consistent growth, gene promotor issues and GMO deregulation.
American Chestnut Cooperators Foundation (ACCF)
Historically have bred pure AC with observed resiliance, however limited genetic diversity.
Closely related species to AC, also decimated by blight. OCF has successfully amplified resistance, through traditional crosses from surviving specimens. Ozark Chinquapin has an older and broader genome than AC, so resistance genes were easier to locate.
Link to Powerpoint presented by Clint Morse of TACF VA Chapter outlining some AC history and an overview of the LSA Breeding program.
American Chestnuts of Michigan 