NDLI: Identification of QTL associated with resistance to bacterial spot race T4 in tomato

Content Provider	Springer Nature Link
Author	Hutton, Samuel F. Scott, Jay W. Yang, Wencai Sim, Sung Chur Francis, David M. Jones, Jeffrey B.
Copyright Year	2010
Abstract	Bacterial spot of tomato (Solanum lycopersicum L.), caused by several Xanthomonas sp., is a serious but difficult disease to control by chemical means. Development of resistance has been hindered by emergence of races virulent to tomato, by the quantitative inheritance of resistance, and by a low correlation between seedling assays and resistance in the field. Resistance to multiple races, including race T4, has been described in the S. lycopersicum var. cerasiformae accession PI 114490. We used molecular markers to identify associations with quantitative trait loci (QTL) in an elite inbred backcross (IBC) population derived from OH 9242, PI 114490 and Fla. 7600, a breeding line with tomato accession Hawaii 7998 (H7998) in its pedigree. Race T4 resistance has also been described in the advanced breeding lines Fla. 8233, Fla. 8517, and Fla. 8326, and a selective genotyping approach was used to identify introgressions associated with resistance in segregating progeny derived from crosses with these lines. In the IBC population, loci on chromosomes 11 and 3, respectively, explained as much as 29.4 and 4.8% of resistance variation. Both these loci were also confirmed by selective genotyping: PI 114490 and H7998 alleles on chromosome 11 each provided resistance. The PI 114490 allele on chromosome 3 was confirmed in the Fla. 8517 population, and an allele of undetermined descent was confirmed at this locus in the Fla. 8326 population. A chromosome 12 allele was associated with susceptibility in the Fla. 8517 population. Additional loci contributing minor effects were also implicated in the IBC population or by selective genotyping. Selection for the major QTL in a marker-directed phenotyping approach should significantly improve the efficiency of breeding for resistance to bacterial spot race T4, although as yet undetected QTL would be necessary to carry out strict marker assisted selection.
Starting Page	1275
Ending Page	1287
Page Count	13
File Format	PDF
ISSN	00405752
Journal	Theoretical and Applied Genetics
Volume Number	121
Issue Number	7
e-ISSN	14322242
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry Plant Biochemistry Agriculture Plant Genetics & Genomics Plant Breeding/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Genetics Medicine Biotechnology Agronomy and Crop Science

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