Mapping QTLs contributing to <Emphasis Type="Italic">Ustilago maydis</Emphasis> resistance in specific plant tissues of maize |
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Authors: | Andrew M Baumgarten Jayanti Suresh Georgiana May Ronald L Phillips |
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Institution: | (1) Department of Plant Biological Sciences, University of Minnesota, 1445 Gortner Ave., St Paul, MN 55108-6026, USA;(2) Department of Agronomy and Plant Genetics, University of Minnesota, 411 Borlaug Hall, 1991 Upper Buford Circle, St Paul, MN 55108-6026, USA;(3) Department of Ecology, Evolution and Behavior, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St Paul, MN 55108, USA;(4) Pioneer Hi-bred International, Inc., 7250 NW 62nd Avenue, P.O. Box 552, Johnston, IA 50131-000, USA |
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Abstract: | Quantitative trait loci (QTL) contributing to the frequency and severity of Ustilago maydis infection in the leaf, ear, stalk, and tassel of maize plants were mapped using an A188 × CMV3 and W23 × CMV3 recombinant
inbred (RI) populations. QTLs mapped to genetic bins 2.04 and 9.04–9.05 of the maize genome contributed strongly (R
2 = 18–28%) to variation in the frequency and severity of U. maydis infection over the entire plant in both populations and within the majority of environments. QTLs mapped to bins 3.05, 3.08,
and 8.00 in the A188 × CMV3 population and bin 4.05 in both populations significantly contributed to the frequency or severity
of infection in only the tassel tissue. QTLs mapped to bin 1.07 in the A188 × CMV3 population and bin 7.00 in the W23 × CMV3
population contributed to U. maydis resistance in only the ear tissue. Interestingly, the CMV3 allele of the QTL mapped to bin 1.10 in the A188 × CMV3 population
significantly contributed to U. maydis susceptibility in the ear and stalk but significantly increased resistance in the tassel tissue. Digenic epistatic interactions
between the QTL mapped to bin 5.08 and four distinct QTLs significantly contributed to the frequency and severity of infection
over the entire plant and within the tassel tissue of the A188 × CMV3 population. Several QTLs detected in this study mapped
to regions of the maize genome containing previously mapped U. maydis resistance QTLs and genes involved in plant disease resistance.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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