2023 journal article
Molecular mapping of quantitative trait loci for resistance to early blight in tomatoes
FRONTIERS IN PLANT SCIENCE, 14.
author keywords: early blight; heritability estimates; QTL analysis; tomatoes; Solanum lycopersicum (L; )
TL;DR:
It is demonstrated that genetic control of EB resistance in NC 1CELBR is polygenic, and this study may facilitate further fine mapping of the EB-resistant QTL and marker-assisted selection to transfer EB resistance genes into elite tomato varieties, including broadening the genetic diversity ofEB resistance in tomatoes.
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www.frontiersin.org (publisher PDF)
Source: Web Of Science
Added: July 3, 2023
Early blight (EB), caused by Alternaria linariae (Neerg.) (syn. A. tomatophila) Simmons, is a disease that affects tomatoes (Solanum lycopersicum L.) throughout the world, with tremendous economic implications. The objective of the present study was to map the quantitative trait loci (QTL) associated with EB resistance in tomatoes. The F2 and F2:3 mapping populations consisting of 174 lines derived from NC 1CELBR (resistant) × Fla. 7775 (susceptible) were evaluated under natural conditions in the field in 2011 and in the greenhouse in 2015 by artificial inoculation. In all, 375 Kompetitive Allele Specific PCR (KASP) assays were used for genotyping parents and the F2 population. The broad-sense heritability estimate for phenotypic data was 28.3%, and 25.3% for 2011, and 2015 disease evaluations, respectively. QTL analysis revealed six QTLs associated with EB resistance on chromosomes 2, 8, and 11 (LOD 4.0 to 9.1), explaining phenotypic variation ranging from 3.8 to 21.0%. These results demonstrate that genetic control of EB resistance in NC 1CELBR is polygenic. This study may facilitate further fine mapping of the EB-resistant QTL and marker-assisted selection (MAS) to transfer EB resistance genes into elite tomato varieties, including broadening the genetic diversity of EB resistance in tomatoes.