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Vanessa E.T.M. Ashworth, Haofeng Chen, Carlos L. Calderón-Vázquez, Mary Lu Arpaia, David N. Kuhn, Mary L. Durbin, Livia Tommasini, Elizabeth Deyett, Zhenyu Jia, Michael T. Clegg, and Philippe E. Rolshausen

of considerable interest, raising the question whether mapping and quantitative trait locus studies may nonetheless be worthwhile, given adequate precautions. With the advent of next-generation technologies, the costs associated with developing

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Cecilia E. McGregor, Vickie Waters, Tripti Vashisth, and Hussein Abdel-Haleem

. Jouanne, S. Coubriche, D. Jamin, P. Moreau, L. Charcosset, A. 2009 Fine mapping and haplotype structure analysis of a major flowering time quantitative trait locus on maize chromosome 10 Genetics 183 1555 1563 Ducrocq, S. Madur, D. Veyrieras, J.-B. Camus

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Xiaohe Song and Zhanao Deng

1 are presented in Table 2 . Fig. 2. Quantitative trait locus (QTL) mapping for powdery mildew (PM) resistance in gerbera breeding line UFGE 4033. The x-axis shows the genetic linkage map of gerbera linkage group 1 (LG1) calculated by MAPMAKER

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Geoffrey Meru and Cecilia E. McGregor

the quantitative trait locus associated with resistance to Fusarium oxysporum f. sp. niveum race 2 and the corresponding 2-likelihood-odds (LOD) support interval for separate and joint data for disease severity observed at 26 d after inoculation

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Xuefei Ning, Xianlei Wang, Zhijie Yu, Simeng Lu, and Guan Li

, shape, and weight detected on WinQTLCart 2.5. Mapping of quantitative trait locus (QTL) correlated with seed shape in LG I also identified significant QTL for SL in this region. Fine genetic and physical mapping of the wave seed and tight-placenta locus

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Lyle T. Wallace and Michael J. Havey

Cucumber (Cucumis sativus) plants regenerated from cell cultures occasionally possess mosaic (MSC) phenotypes on cotyledons and leaves. Lines MSC3 and MSC16 have distinct MSC phenotypes and originated from plants regenerated from different cell-culture experiments established using a highly inbred wild-type cucumber. Both the mitochondrial (mt) DNA and MSC phenotype of cucumber show paternal transmission, and MSC3 and MSC16 have different mt coding regions at significantly lower copy numbers relative to wild-type plants. A nuclear locus, Paternal sorting of mitochondria (Psm), conditions a high proportion of wild-type progenies, specifically when MSC16 is crossed as the male with wild-type female plants. During this research, we identified plants that produced a high proportion of wild-type progenies in crosses with MSC3 as the male parent. Plants from an F2 family were crossed with MSC3 as the male, progenies were scored for numbers of MSC vs. wild-type plants, and single-nucleotide polymorphisms (SNP) were identified for genetic mapping. A major quantitative trait locus on chromosome 3 was associated with a higher frequency of wild-type progenies from MSC3 as the male parent, and the 1.5-logarithm-of-odds interval for the most significant SNP was located 627 kb from Psm. These results reveal that separate genetic factors control sorting to the wild-type phenotype in progenies from crosses with different MSC parents. The identification of causal genes controlling mitochondrial sorting in cucumber should provide insight regarding nuclear-mitochondrial interactions affecting the prevalence of specific mitochondrial DNA in plants.

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Patrick D. O'Boyle, James D. Kelly, and William W. Kirk

, P.M. Mundt, C. Richardson, K. Sandoval-Islas, S. Vivar, H. 2003 Pyramiding and validation of quantitative trait locus (QTL) alleles determining resistance to barley stripe rust: effects on adult plant

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Jen Colcol Marzu, Elizabeth Straley, and Michael J. Havey

Pink root [PR (caused by Phoma terrestris)] is a major soil-borne disease of onion (Allium cepa) and reduces both yield and quality of bulbs. PR-resistant cultivars offer the best control option for this disease. The objectives of this study were to complete genetic analyses and mapping of PR resistances from independent sources. Segregating families were developed from different sources of PR resistance and evaluated using a seedling screen. PR severity in two segregating families from the same source of resistance mapped to one position on chromosome 4 with logarithm of odds (LOD) scores of 8.0 and 10.3, and explained 28% and 35% of the phenotypic variation, respectively. Estimates of additive and dominance effects revealed this source of PR resistance is codominantly inherited. PR resistance from a second source was assessed by percent survival in the seedling evaluation, showed codominance, and mapped to the same region on chromosome 4 at LOD 12.5 and explained 54% of the phenotypic variation. This research demonstrates that PR resistance from different sources mapped to the same chromosome region and showed similar modes of inheritance.

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Aliya Momotaz, Jay W. Scott, and David J. Schuster

linkage between a marker locus and a quantitative trait locus Theor. Appl. Genet. 85 353 359 Denholm, I. Cahill, M. Byrne, F.J. Devonshire, A.L. 1996 Progress with documenting and combating

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Jareerat Chunthawodtiporn, Theresa Hill, Kevin Stoffel, and Allen Van Deynze

resistance using stepwiseqtl from R/qtl in RIL population for a cross between Maor and CM334. Fig. 3. Quantitative trait locus (QTL) map of P. capsici resistance and horticultural traits ( Chunthawodtiporn et al., 2018 ) on chromosomes 5, 10, and 11