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Publication Title: 
, et al. (2024)
Title: 
Mapping QTLs for blight resistance and morphological traits in inter-species hybrid families of 2 chestnut (Castanea spp.)
Authors: 
, Georgi, Laura L, Hebard, Frederick V, Zhebentyayeva, Tetyana, Yu, Jiali , Sisco, Paul H, Fitzsimmons, Sara F, Staton, Margaret E, Abbott, Albert G, Nelson, C Dana
Publication Year: 
2024
Series Name: 
..
Abstract: 
Chestnut blight (caused by Cryphonectria parasitica, Cp), together with Phytophthora root rot (caused by Phytophthora cinnamomi, Pc), has nearly extirpated American chestnut (Castanea dentata) from its native range. In contrast to the susceptibility of American chestnut, many Chinese chestnut (C. mollissima) genotypes are resistant to blight. In this research, we performed a series of genome-wide association studies (GWAS) for blight resistance originating from three unrelated Chinese chestnut trees (Mahogany, Nanking and M16) and a QTL study on a Mahogany-derived inter-species F2 family. We evaluated trees for resistance to blight after artificial inoculation with two Cp strains and scored nine morpho-phenological (M/P) traits that are the hallmarks of species differentiation between American and Chinese chestnuts. Results support a moderately complex genomic architecture for blight resistance, as 3121 QTLs were found on 11 of the 12 chromosomes across all studies. Additionally, although most M/P trait QTLs overlap or are adjacent to blight resistance QTLs, they tend to aggregate in a few genomic regions. This indicates that it will be difficult, but still possible to eliminate Chinese chestnut alleles for these traits while achieving relatively high blight resistance in the backcross hybrid tree. Finally, comparison between QTL intervals for blight resistance and those previously published for Phytophthora root rot resistance, revealed fivethree common disease resistance regions on chromosomes 1, 5, and 11.
Publication Species: 
Castanea dentata x mollissma ()
Volume: 
Issue: 
Page Numbers: 
DOI: 
PubMed: 
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