Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
Molecular mapping of resistance to blight in an interspecific cross in the genus CastaneaAuthor(s): Thomas L. Kubisiak; F.V. Hebard; C. Dana Nelson; Jiansu Zhang; R. Bernatzky; H. Huang; S.L. Anagnostakis; R.L. Doudrick
Source: Phytopathology. 87: 751-759
Publication Series: Miscellaneous Publication
PDF: View PDF (331 KB)
DescriptionA three-generation American chestnut x Chinese chestnut pedigree was used to construct a genetic linkage map for chestnut and to investigate the control of resistance to Endothia parasitica (chestnut blight fungus). DNA genotypes for 241 polymorphic markers (eight isozymes, 17 restriction fragment length polymorphisms [RFLPs], and 216 random amplified polymorphic DNAs [RAPDs]) were assayed on an F2 family consisting of 102 individuals. Of these markers, 196 were segregating as expected and, subsequently, used for primary linkage mapping. Two isozymes, 12 RFLPs, and 170 RAPDs were mapped to 12 linkage groups spanning a total genetic distance of 530.1 Kosambi centimorgans. F2 plants were evaluated for a response to E. parasitica infection by directly inoculating them with two unique fungal isolates and measuring canker expansion over a period of 3.5 months. Results were compared with the marker genotype data, thereby identifying genomic regions significantly associated with a resistance response. Single-marker or nonsimultaneous analyses of variance identified seven genomic regions that appear to have an effect on host response. Multiple-marker or simultaneous models suggest that three of these regions have a significant effect on host response, together explaining as much as 42.2 percent of the total variation for canker size. At each of the three putative resistance loci, alleles derived from the Chinese chestnut grandparent were associated with smaller canker size, or higher levels of resistance.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationKubisiak, Thomas L.; Hebard, F.V.; Nelson, C. Dana; Zhang, Jiansu; Bernatzky, R.; Huang, H.; Anagnostakis, S.L.; Doudrick, R.L. 1997. Molecular mapping of resistance to blight in an interspecific cross in the genus Castanea. Phytopathology. 87: 751-759
- Genetic and genomic resources for mapping resistance to Phytophthora cinnamomi in chestnut
- Mapping resistance to Phytophthora cinnamomi in chestnut (Castanea sp.)
- Polymorphic sequence-characterized codominant loci in the chestnut blight fungus, Cryphonectria parasitica
XML: View XML