@article{dewitt_guedira_lauer_sarinelli_tyagi_fu_hao_murphy_marshall_akhunova_et al._2020, title={Sequence-based mapping identifies a candidate transcription repressor underlying awn suppression at the B1 locus in wheat}, volume={225}, ISSN={["1469-8137"]}, DOI={10.1111/nph.16152}, abstractNote={Summary Awns are stiff, hair‐like structures which grow from the lemmas of wheat (Triticum aestivum) and other grasses that contribute to photosynthesis and play a role in seed dispersal. Variation in awn length in domesticated wheat is controlled primarily by three major genes, most commonly the dominant awn suppressor Tipped1 (B1). This study identifies a transcription repressor responsible for awn inhibition at the B1 locus. Association mapping was combined with analysis in biparental populations to delimit B1 to a distal region of 5AL colocalized with QTL for number of spikelets per spike, kernel weight, kernel length, and test weight. Fine‐mapping located B1 to a region containing only two predicted genes, including C2H2 zinc finger transcriptional repressor TraesCS5A02G542800 upregulated in developing spikes of awnless individuals. Deletions encompassing this candidate gene were present in awned mutants of an awnless wheat. Sequence polymorphisms in the B1 coding region were not observed in diverse wheat germplasm whereas a nearby polymorphism was highly predictive of awn suppression. Transcriptional repression by B1 is the major determinant of awn suppression in global wheat germplasm. It is associated with increased number of spikelets per spike and decreased kernel size.}, number={1}, journal={NEW PHYTOLOGIST}, author={DeWitt, Noah and Guedira, Mohammed and Lauer, Edwin and Sarinelli, Martin and Tyagi, Priyanka and Fu, Daolin and Hao, QunQun and Murphy, J. Paul and Marshall, David and Akhunova, Alina and et al.}, year={2020}, month={Jan}, pages={326–339} }
 @article{mashaheet_burkey_marshall_2019, title={Chromosome Location Contributing to Ozone Tolerance in Wheat}, volume={8}, ISSN={["2223-7747"]}, DOI={10.3390/plants8080261}, abstractNote={Breeding wheat for higher grain yield can contribute to global food security and sustainable production on less land. Tropospheric ozone can injure wheat plants and subsequently reduce grain yield. Identification of ozone tolerance in the wheat genome can assist plant breeders in developing new sources of tolerant germplasm. Our objective was to use the ‘Chinese Spring’ monosomic lines to screen for ozone response and identify the chromosomic locations contributing to ozone tolerance based on foliar injury. Two methodologies, Continuous Stirred Tank Reactors and Outdoor Plant Environment Chambers, were used to expose wheat monosomic lines to varying concentrations and durations of ozone. Each wheat monosomic line in ‘Chinese Spring’ has a missing chromosome in each of the wheat subgenomes (A, B, and D). In both methodologies, we found significant and repeatable data to identify chromosome 7A as a major contributor to tolerance to ozone injury in ‘Chinese Spring’. In every experiment, the absence of chromosome 7A resulted in significant injury to wheat due to ozone. This was not the case when any other chromosome was missing.}, number={8}, journal={PLANTS-BASEL}, author={Mashaheet, Alsayed M. and Burkey, Kent O. and Marshall, David S.}, year={2019}, month={Aug} }
 @article{guedira_xiong_hao_johnson_harrison_marshall_brown-guedira_2016, title={Heading Date QTL in Winter Wheat (Triticum aestivum L.) Coincide with Major Developmental Genes VERNALIZATION1 and PHOTOPERIOD1}, volume={11}, ISSN={["1932-6203"]}, DOI={10.1371/journal.pone.0154242}, abstractNote={In wheat (Triticum aestivum L.), time from planting to spike emergence is influenced by genes controlling vernalization requirement and photoperiod response. Characterizing the available genetic diversity of known and novel alleles of VERNALIZATION1 (VRN1) and PHOTOPERIOD1 (PPD1) in winter wheat can inform approaches for breeding climate resilient cultivars. This study identified QTL for heading date (HD) associated with multiple VRN1 and PPD1 loci in a population developed from a cross between two early flowering winter wheat cultivars. When the population was grown in the greenhouse after partial vernalization treatment, major heading date QTLs co-located with the VRN-A1 and VRN-B1 loci. Copy number variation at the VRN-A1 locus influenced HD such that RIL having three copies required longer cold exposure to transition to flowering than RIL having two VRN-A1 copies. Sequencing vrn-B1 winter alleles of the parents revealed multiple polymorphisms in the first intron that were the basis of mapping a major HD QTL coinciding with VRN-B1. A 36 bp deletion in the first intron of VRN-B1 was associated with earlier HD after partial vernalization in lines having either two or three haploid copies of VRN-A1. The VRN1 loci interacted significantly and influenced time to heading in field experiments in Louisiana, Georgia and North Carolina. The PPD1 loci were significant determinants of heading date in the fully vernalized treatment in the greenhouse and in all field environments. Heading date QTL were associated with alleles having large deletions in the upstream regions of PPD-A1 and PPD-D1 and with copy number variants at the PPD-B1 locus. The PPD-D1 locus was determined to have the largest genetic effect, followed by PPD-A1 and PPD-B1. Our results demonstrate that VRN1 and PPD1 alleles of varying strength allow fine tuning of flowering time in diverse winter wheat growing environments.}, number={5}, journal={PLOS ONE}, author={Guedira, Mohammed and Xiong, Mai and Hao, Yuan Feng and Johnson, Jerry and Harrison, Steve and Marshall, David and Brown-Guedira, Gina}, year={2016}, month={May} }
 @article{rudd_devkota_ibrahim_marshall_sutton_baker_peterson_herrington_rooney_nelson_et al._2015, title={'TAM 304' wheat, adapted to the adequate rainfall or high-input irrigated production system in the Southern Great Plains}, volume={9}, number={3}, journal={Journal of Plant Registrations}, author={Rudd, J. C. and Devkota, R. N. and Ibrahim, A. M. and Marshall, D. and Sutton, R. and Baker, J. A. and Peterson, G. L. and Herrington, R. and Rooney, L. W. and Nelson, L. R. and et al.}, year={2015}, pages={331–337} }
 @article{petersen_lyerly_worthington_parks_cowger_marshall_brown-guedira_murphy_2015, title={Mapping of powdery mildew resistance gene Pm53 introgressed from Aegilops speltoides into soft red winter wheat}, volume={128}, ISSN={["1432-2242"]}, DOI={10.1007/s00122-014-2430-8}, abstractNote={A powdery mildew resistance gene was introgressed from Aegilops speltoides into winter wheat and mapped to chromosome 5BL. Closely linked markers will permit marker-assisted selection for the resistance gene. Powdery mildew of wheat (Triticum aestivum L.) is a major fungal disease in many areas of the world, caused by Blumeria graminis f. sp. tritici (Bgt). Host plant resistance is the preferred form of disease prevention because it is both economical and environmentally sound. Identification of new resistance sources and closely linked markers enable breeders to utilize these new sources in marker-assisted selection as well as in gene pyramiding. Aegilops speltoides (2n = 2x = 14, genome SS), has been a valuable disease resistance donor. The powdery mildew resistant wheat germplasm line NC09BGTS16 (NC-S16) was developed by backcrossing an Ae. speltoides accession, TAU829, to the susceptible soft red winter wheat cultivar 'Saluda'. NC-S16 was crossed to the susceptible cultivar 'Coker 68-15' to develop F2:3 families for gene mapping. Greenhouse and field evaluations of these F2:3 families indicated that a single gene, designated Pm53, conferred resistance to powdery mildew. Bulked segregant analysis showed that multiple simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) markers specific to chromosome 5BL segregated with the resistance gene. The gene was flanked by markers Xgwm499, Xwmc759, IWA6024 (0.7 cM proximal) and IWA2454 (1.8 cM distal). Pm36, derived from a different wild wheat relative (T. turgidum var. dicoccoides), had previously been mapped to chromosome 5BL in a durum wheat line. Detached leaf tests revealed that NC-S16 and a genotype carrying Pm36 differed in their responses to each of three Bgt isolates. Pm53 therefore appears to be a new source of powdery mildew resistance.}, number={2}, journal={THEORETICAL AND APPLIED GENETICS}, author={Petersen, Stine and Lyerly, Jeanette H. and Worthington, Margaret L. and Parks, Wesley R. and Cowger, Christina and Marshall, David S. and Brown-Guedira, Gina and Murphy, J. Paul}, year={2015}, month={Feb}, pages={303–312} }
 @article{bernardo_bowden_rouse_newcomb_marshall_bai_2013, title={Validation of molecular markers for new stem rust resistance genes in US hard winter wheat}, volume={53}, number={3}, journal={Crop Science}, author={Bernardo, A. N. and Bowden, R. L. and Rouse, M. N. and Newcomb, M. S. and Marshall, D. S. and Bai, G. H.}, year={2013}, pages={755–764} }
 @article{sthapit_gbur_brown-guedira_marshall_milus_2012, title={Characterization of Resistance to Stripe Rust in Contemporary Cultivars and Lines of Winter Wheat from the Eastern United States}, volume={96}, ISSN={["0191-2917"]}, DOI={10.1094/pdis-07-11-0612}, abstractNote={ Stripe rust, caused by Puccinia striiformis f. sp. tritici, has been an important disease of winter wheat (Triticum aestivum) in the eastern United States since 2000, when a new strain of the pathogen emerged. The new strain overcame the widely used resistance gene, Yr9, and was more aggressive and better adapted to warmer temperatures than the old strain. Host resistance is the most effective approach to manage stripe rust. Winter wheat lines with resistance to the new strain in the field are common, but the genes conferring this resistance are mostly unknown. The objectives of this research were to characterize the all-stage resistance and adult-plant resistance (APR) to stripe rust in a representative group of contemporary winter wheat cultivars and breeding lines and to identify the resistance genes when possible. Of the 50 lines evaluated for all-stage resistance at the seedling stage, nearly all were susceptible to the new strain. Based on a linked molecular marker, seven lines had resistance gene Yr17 that confers resistance to both old and new strains; however, this resistance was difficult to identify in the seedling stage. Of the 19 lines evaluated for APR, all expressed APR compared with a very susceptible check. Nine had race-specific APR to the new strain and nine had APR to both old and new strains. The remaining line, 26R61, had all-stage resistance to the old strain (conferred by resistance gene Yr9) and a high level of APR to the new strain. APR was expressed as low infection type, low percent leaf area diseased, and long latent period at heading stage under both low and high temperature regimes and could be identified as early as jointing stage. Based on tests for linked molecular markers, the most widely used slow-rusting APR genes, Yr18 and Yr29, were not present in any of the lines. The results of this research indicate that effective all-stage resistance was conferred only by Yr17 and that APR was common and likely conferred by unknown race-specific genes rather than genes conferring slow rusting that are more likely to be durable. }, number={5}, journal={PLANT DISEASE}, author={Sthapit, Jinita and Gbur, Edward E. and Brown-Guedira, Gina and Marshall, David S. and Milus, Eugene A.}, year={2012}, month={May}, pages={737–745} }
 @article{lewis_siler_ellis_souza_ng_dong_brown-guedira_marshall_kolmer_jiang_et al._2012, title={Registration of 'Red Ruby' Wheat}, volume={6}, ISSN={["1936-5209"]}, DOI={10.3198/jpr2011.09.0509crc}, abstractNote={‘Red Ruby’ (Reg. No. CV‐1072, PI 662035) soft red winter wheat (Triticum aestivum L.) was developed by the Michigan Agricultural Experiment Station and released in 2007 via an exclusive licensing agreement through Michigan State University Technologies. Red Ruby was selected from the cross Pioneer ‘2552’/Pioneer ‘2737W’ made in 1995. The original objective of the cross was the development of high‐yielding soft white winter wheats with good end‐use quality. Although soft white wheat is a very valuable commodity in Michigan, currently more soft red wheat is produced, and therefore there is also a high demand for improved soft red wheats. Red Ruby is a high‐yielding, F4–derived line with the original experimental number E1007R. A bulk breeding method was used to develop the cultivar, with bulk selections in early generations, followed by a headrow selection in the F5 and bulking again in later generations. In addition to standard yield‐test criteria, milling and baking performances also were considered for selection. Red Ruby was released because of its high yield, high test weight, and red grain color. Red Ruby is well adapted to Michigan.}, number={3}, journal={JOURNAL OF PLANT REGISTRATIONS}, author={Lewis, Janet M. and Siler, Lee and Ellis, Donna and Souza, Edward and Ng, Perry K. W. and Dong, Yanhong and Brown-Guedira, Gina and Marshall, David and Kolmer, Jim and Jiang, Guo-Liang and et al.}, year={2012}, month={Sep}, pages={324–332} }
 @article{maloney_lyerly_wooten_anderson_livingston_brown-guedira_marshall_murphy_2011, title={Marker Development and Quantitative Trait Loci in a Fall-Sown Oat Recombinant Inbred Population}, volume={51}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci2010.04.0224}, abstractNote={ABSTRACTMarker‐assisted selection for improved winter survival in oat (Avena sativa L.) is difficult because the number of simple sequence repeat (SSR) markers available in this species is limited. The objectives of this research were to increase the number of SSR markers on the ‘Fulghum’ × ‘Norline’ recombinant inbred population genetic map and to scan for quantitative trait loci (QTL) associated with winter field survival, crown freezing tolerance, vernalization response, and heading date. New SSR markers were developed from ‘Kanota’ and ‘Ogle’ genomic DNA libraries enriched for eight microsatellite motifs. New primers were evaluated for amplification, reproducibility, and polymorphism in 11 oat lines. Simple sequence repeat markers showing high‐quality polymorphism between Fulghum and Norline were subsequently examined in 128 recombinant inbred lines. Sixty‐five new SSR, four single nucleotide polymorphism (SNP), and one cleaved amplified polymorphic sequence (CAPS) markers were added to the Fulghum × Norline linkage map. This brought the total number of markers mapped on the population to 101. Phenotypic data for winter hardiness component traits in the population were obtained in previous field and controlled chamber experiments. All previously mapped markers and new SSR markers were evaluated and QTL identified. Marker loci on linkage group FN1_3_38 accounted for multiple QTL associated with winter hardiness component traits. The addition of new SSR markers to the Fulghum × Norline map in regions with winter hardiness component trait QTL will enhance marker assisted selection for these important traits.}, number={2}, journal={CROP SCIENCE}, author={Maloney, P. V. and Lyerly, J. H. and Wooten, D. R. and Anderson, J. M. and Livingston, D. P., III and Brown-Guedira, G. and Marshall, D. and Murphy, J. P.}, year={2011}, month={Mar}, pages={490–502} }
 @article{olson_brown-guedira_marshall_stack_bowden_jin_rouse_pumphrey_2010, title={Development of Wheat Lines Having a Small Introgressed Segment Carrying Stem Rust Resistance Gene Sr22}, volume={50}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci2009.11.0652}, abstractNote={ABSTRACT}, number={5}, journal={CROP SCIENCE}, author={Olson, Eric L. and Brown-Guedira, Gina and Marshall, David and Stack, Ellen and Bowden, Robert L. and Jin, Yue and Rouse, Matthew and Pumphrey, Michael O.}, year={2010}, pages={1823–1830} }
 @article{guedira_brown-guedira_van sanford_sneller_souza_marshall_2010, title={Distribution of Rht Genes in Modern and Historic Winter Wheat Cultivars from the Eastern and Central USA}, volume={50}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci2009.10.0626}, abstractNote={ABSTRACT}, number={5}, journal={CROP SCIENCE}, author={Guedira, M. and Brown-Guedira, G. and Van Sanford, D. and Sneller, C. and Souza, E. and Marshall, D.}, year={2010}, pages={1811–1822} }
 @article{olson_brown-guedira_marshall_jin_mergoum_lowe_dubcovsky_2010, title={Genotyping of US Wheat Germplasm for Presence of Stem Rust Resistance Genes Sr24, Sr36 and Sr1RS(Amigo)}, volume={50}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci2009.04.0218}, abstractNote={The stem rust resistance genes Sr24, Sr26, Sr36, and Sr1RSAmigo confer resistance to race TTKSK (= Ug99) of Puccinia graminis f. sp. tritici Pers. (Pgt). A collection of 776 cultivars and breeding lines of wheat (Triticum aestivum L.) from all growing regions of the United States were screened with simple sequence repeat and sequence tagged site markers linked to Sr24, Sr26, Sr36, and Sr1RSAmigo to determine frequencies of these genes in U.S. wheat germplasm. Marker efficacy in predicting the presence of these genes was evaluated via comparison with assayed seedling infection type. Among the lines evaluated, the most predominant gene is Sr24, present in hard winter, hard spring, and soft winter wheat lines. Resistance in soft winter wheat is primarily due to Sr36 The 1RS·1AL rye translocation carrying Sr1RSAmigo is present at equal frequencies in hard winter and soft winter wheat. Utilization of marker‐assisted selection for stem rust resistance genes can hasten the development of wheat cultivars resistant to TTKSK and its variants and allow for the development of resistance gene pyramids for more durable stem rust resistance.}, number={2}, journal={CROP SCIENCE}, author={Olson, Eric L. and Brown-Guedira, Gina and Marshall, David S. and Jin, Yue and Mergoum, Mohamed and Lowe, Lago and Dubcovsky, Jorge}, year={2010}, pages={668–675} }
 @article{maxwell_lyerly_cowger_marshall_brown-guedira_murphy_2009, title={MlAG12: a Triticum timopheevii-derived powdery mildew resistance gene in common wheat on chromosome 7AL}, volume={119}, ISSN={["1432-2242"]}, DOI={10.1007/s00122-009-1150-y}, abstractNote={Wheat powdery mildew is an economically important disease in cool and humid environments. Powdery mildew causes yield losses as high as 48% through a reduction in tiller survival, kernels per head, and kernel size. Race-specific host resistance is the most consistent, environmentally friendly and, economical method of control. The wheat (Triticum aestivum L.) germplasm line NC06BGTAG12 possesses genetic resistance to powdery mildew introgressed from the AAGG tetraploid genome Triticum timopheevii subsp. armeniacum. Phenotypic evaluation of F(3) families derived from the cross NC06BGTAG12/'Jagger' and phenotypic evaluation of an F(2) population from the cross NC06BGTAG12/'Saluda' indicated that resistance to the 'Yuma' isolate of powdery mildew was controlled by a single dominant gene in NC06BGTAG12. Bulk segregant analysis (BSA) revealed simple sequence repeat (SSR) markers specific for chromosome 7AL segregating with the resistance gene. The SSR markers Xwmc273 and Xwmc346 mapped 8.3 cM distal and 6.6 cM proximal, respectively, in NC06BGTAG12/Jagger. The multiallelic Pm1 locus maps to this region of chromosome 7AL. No susceptible phenotypes were observed in an evaluation of 967 F(2) individuals in the cross NC06BGTAG12/'Axminster' (Pm1a) which indicated that the NC06BGTAG12 resistance gene was allelic or in close linkage with the Pm1 locus. A detached leaf test with ten differential powdery mildew isolates indicated the resistance in NC06BGTAG12 was different from all designated alleles at the Pm1 locus. Further linkage and allelism tests with five other temporarily designated genes in this very complex region will be required before giving a permanent designation to this gene. At this time the gene is given the temporary gene designation MlAG12.}, number={8}, journal={THEORETICAL AND APPLIED GENETICS}, author={Maxwell, Judd J. and Lyerly, Jeanette H. and Cowger, Christina and Marshall, David and Brown-Guedira, Gina and Murphy, J. Paul}, year={2009}, month={Nov}, pages={1489–1495} }
 @article{wooten_livingston_lyerly_holland_jellen_marshall_murphy_2009, title={Quantitative Trait Loci and Epistasis for Oat Winter-Hardiness Component Traits}, volume={49}, ISSN={["1435-0653"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-70749094348&partnerID=MN8TOARS}, DOI={10.2135/cropsci2008.10.0612}, abstractNote={ABSTRACT}, number={6}, journal={CROP SCIENCE}, author={Wooten, D. R. and Livingston, D. P., III and Lyerly, H. J. and Holland, J. B. and Jellen, E. N. and Marshall, D. S. and Murphy, J. P.}, year={2009}, pages={1989–1998} }
 @article{fellner_burns_marshall_2008, title={Effect of feeding corn, hull-less or hulled barley on fermentation by mixed cultures of ruminal microorganisms}, volume={91}, ISSN={["0022-0302"]}, DOI={10.3168/jds.2007-0078}, abstractNote={Increased demands for corn grain warrant the evaluation of alternative grain types for ruminant production systems. This study was conducted to determine the effects of hulled and hull-less barley (Hordeum vulgare L.) cultivars compared with corn (Zea mays L.) as an alternative grain type on fermentation in cultures of mixed ruminal microorganisms. Three continuous fermentors were fed 14 g of dry feed per day (divided equally between 2 feedings) consisting of alfalfa (Medicago sativa L.) hay pellets (40% of dry matter) and 1) ground corn, 2) hulled barley, or 3) hull-less barley concentrate (60% of dry matter) in each fermentor. Following an adaptation period of 5 d, culture samples were taken at 2 h after the morning feeding on d 6, 7, and 8 of each period for analysis. A second run of the fermentors followed the same treatment sequence to provide replication. Culture pH was reduced with corn (5.55) and did not differ between barley cultivars (average pH 5.89). Total volatile fatty acid concentration and acetate to propionate ratio were not different across grain type or barley cultivar with the exception of greater total volatile fatty acid concentrations with hull-less barley. Corn produced less methane (14.6 mmol/d) and ammonia-N (7.3 mg/100 mL) compared with barley (33.1 mmol/d and 22 mg/100 mL, respectively); methane was greater with hull-less barley but ammonia-N concentration was similar between the 2 barley cultivars. Hull-less barley had greater digestibility compared with hulled barley, and corn had reduced digestibility compared with barley. Concentrations of C18:0 were greater and those of C18:1 and C18:2 lesser in cultures fed hulled and hull-less barley compared with corn. Our data indicate that grain type and barley cultivar have an impact on ruminal fermentation. The lesser starch concentration of barley minimized the drop in culture pH and improved digestibility.}, number={5}, journal={JOURNAL OF DAIRY SCIENCE}, author={Fellner, V. and Burns, J. C. and Marshall, D. S.}, year={2008}, month={May}, pages={1936–1941} }
 @article{perugini_murphy_marshall_brown-guedira_2008, title={Pm37, a new broadly effective powdery mildew resistance gene from Triticum timopheevii}, volume={116}, ISSN={["1432-2242"]}, DOI={10.1007/s00122-007-0679-x}, abstractNote={Powdery mildew is an important foliar disease in wheat, especially in areas with a cool or maritime climate. A dominant powdery mildew resistance gene transferred to the hexaploid germplasm line NC99BGTAG11 from T. timopheevii subsp. armeniacum was mapped distally on the long arm of chromosome 7A. Differential reactions were observed between the resistance gene in NC99BGTAG11 and the alleles of the Pm1 locus that is also located on chromosome arm 7AL. Observed segregation in F2:3 lines from the cross NC99BGTAG11xAxminster (Pm1a) demonstrate that germplasm line NC99BGTAG11 carries a novel powdery mildew resistance gene, which is now designated as Pm37. This new gene is highly effective against all powdery mildew isolates tested so far. Analyses of the population with molecular markers indicate that Pm37 is located 16 cM proximal to the Pm1 complex. Simple sequence repeat (SSR) markers Xgwm332 and Xwmc790 were located 0.5 cM proximal and distal, respectively, to Pm37. In order to identify new markers in the region, wheat expressed sequence tags (ESTs) located in the distal 10% of 7AL that were orthologous to sequences from chromosome 6 of rice were targeted. The two new EST-derived STS markers were located distal to Pm37 and one marker was closely linked to the Pm1a region. These new markers can be used in marker-assisted selection schemes to develop wheat cultivars with pyramids of powdery mildew resistance genes, including combinations of Pm37 in coupling linkage with alleles of the Pm1 locus.}, number={3}, journal={THEORETICAL AND APPLIED GENETICS}, author={Perugini, L. D. and Murphy, J. P. and Marshall, D. and Brown-Guedira, G.}, year={2008}, month={Feb}, pages={417–425} }
 @article{wooten_livingston_holland_marshall_murphy_2008, title={Quantitative trait loci and epistasis for crown freezing tolerance in the 'Kanota' x 'Ogle' hexaploid oat mapping population}, volume={48}, ISSN={["1435-0653"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-35348818142&partnerID=MN8TOARS}, DOI={10.2135/cropsci2006.12.0793}, abstractNote={Crown freezing tolerance is the most important factor conferring oat (Avena spp.) winter hardiness. The objective of this study was to identify quantitative trait loci (QTL) for crown freezing tolerance in the ‘Kanota’ × ‘Ogle’ recombinant inbred line (RIL) mapping population and to examine their relationship with other winter hardiness traits. One hundred thirty‐five RILs were evaluated for crown freezing tolerance in a controlled environment. Previously published molecular marker and linkage map information was used for QTL detection. Seven QTL and four complementary epistatic interactions were identified that accounted for 56% of the phenotypic variation. Ogle contributed alleles for increased crown freezing tolerance at three loci, while Kanota contributed alleles for increased crown freezing tolerance at four loci. All loci where Kanota alleles increased crown freezing tolerance showed complementary epistasis for decreased crown freezing tolerance with the QTL near UMN13. Two of the major QTL identified were in the linkage groups (LG) associated with a reciprocal translocation between chromosomes 7C and 17, which was previously associated with spring growth habit in oat. The results confirm the importance of the chromosomes involved in the reciprocal 7C‐17 translocation in controlling winter hardiness component traits.}, number={1}, journal={CROP SCIENCE}, author={Wooten, David R. and Livingston, David P., III and Holland, James B. and Marshall, David S. and Murphy, J. Paul}, year={2008}, pages={149–157} }
 @article{parks_carbone_murphy_marshall_cowger_2008, title={Virulence structure of the Eastern US wheat powdery mildew population}, volume={92}, ISSN={["0191-2917"]}, DOI={10.1094/PDIS-92-7-1074}, abstractNote={ Little is known about the population structure of wheat powdery mildew in the eastern United States, and the most recent report on virulence in this population involved isolates collected in 1993–94. In the present study, wheat leaves naturally infected with powdery mildew were collected from 10 locations in the southeastern United States in 2003 and 2005 and a collection of 207 isolates was derived from single ascospores. Frequencies of virulence to 16 mildew resistance (Pm) genes were determined by inoculating the isolates individually on replicated plates of detached leaves of differential wheat lines. These virulence frequencies were used to infer local effectiveness of Pm genes, estimate virulence complexity, detect significant associations between pairs of pathogen avirulence loci, and assess whether phenotypic differences between pathogen subpopulations increased with geographic distance. In both years, virulence to Pm3a, Pm3c, Pm5a, and Pm7 was present in more than 90% of sampled isolates and virulence to Pm1a, Pm16, Pm17, and Pm25 was present in fewer than 10% of isolates. In each year, 71 to 88% of all sampled isolates possessed one of a few multilocus virulence phenotypes, although there were significant differences among locations in frequencies of virulence to individual Pm genes. Several significant associations were detected between alleles for avirulence to pairs of Pm genes. Genetic (phenotypic) distance between isolate subpopulations increased significantly (R2 = 0.40, P < 0.001) with increasing geographic separation; possible explanations include different commercial deployment of Pm genes and restricted gene flow in the pathogen population. }, number={7}, journal={PLANT DISEASE}, author={Parks, Ryan and Carbone, Ignazio and Murphy, J. Paul and Marshall, David and Cowger, Christina}, year={2008}, month={Jul}, pages={1074–1082} }
 @article{wooten_livingston_jellen_boren_marshall_murphy_2007, title={An intergenomic reciprocal translocation associated with oat winter hardiness component traits}, volume={47}, ISSN={["1435-0653"]}, DOI={10.2135/cropsci2006.12.0768}, abstractNote={The reciprocal intergenomic translocation between hexaploid oat (Avena sp.) chromosomes 7C and 17 (T7C‐17) has been associated with the division of cultivated oat into A. sativa L. and A. byzantina K. Koch species and differences in crown freezing tolerance and winter field survival. The objectives of this experiment were: (i) to validate the association of T7C‐17 with crown freezing tolerance and winter field survival in a population derived from a cross of the non‐winter‐hardy ‘Fulghum’ (non‐T7C‐17) with winter‐hardy ‘Norline’ (T7C‐17); (ii) to determine if preferential selection for T7C‐17 occurred during inbreeding; and (iii) to examine the association of T7C‐17 with the winter hardiness component traits heading date, plant height, and vernalization and photoperiod responses. Crown freezing tolerance and vernalization and photoperiod responses were evaluated in controlled environment studies. Heading date, plant height, and winter field survival were evaluated in field experiments during two seasons. The presence of the translocation was associated with greater crown freezing tolerance, winter field survival, and days to flowering. Translocation status was not associated with vernalization and photoperiod responses or plant height. The T7C‐17/non‐T7C‐17 segregation ratio was 2:1. These results confirmed the importance of T7C‐17 in conferring winter hardiness traits in winter oat and preferential selection for the translocation during inbreeding.}, number={5}, journal={CROP SCIENCE}, author={Wooten, David R. and Livingston, David P., III and Jellen, Eric N. and Boren, Kathryn J. and Marshall, David S. and Murphy, J. Paul}, year={2007}, pages={1832–1840} }
 @article{mccullough_work_cavey_liebhold_marshall_2006, title={Interceptions of nonindigenous plant pests at US ports of entry and border crossings over a 17-year period}, volume={8}, DOI={10.1007/s10530-005-1798-4}, number={4}, journal={Biological Invasions}, author={McCullough, D. G. and Work, T. T. and Cavey, J. F. and Liebhold, A. M. and Marshall, D.}, year={2006}, pages={611–630} }
 @article{miranda_murphy_marshall_leath_2006, title={Pm34: a new powdery mildew resistance gene transferred from Aegilops tauschii Coss. to common wheat (Triticum aestivum L.)}, volume={113}, ISSN={["1432-2242"]}, DOI={10.1007/s00122-006-0397-9}, abstractNote={Powdery mildew is a major fungal disease in wheat growing areas worldwide. A novel source of resistance to wheat powdery mildew present in the germplasm line NC97BGTD7 was genetically characterized as a monogenic trait in greenhouse and field trials using F(2) derived lines from a NC97BGTD7 X Saluda cross. Microsatellite markers were used to map and tag this resistance gene, now designated Pm34. Three co-dominant microsatellite markers linked to Pm34 were identified and their most likely order was established as: Xbarc177-5D, 5.4cM, Pm34, 2.6cM, Xbarc144-5D, 14cM, Xgwm272-5D. These microsatellite markers were previously mapped to the long arm of the 5D chromosome and their positions were confirmed using Chinese Spring nullitetrasomic Nulli5D-tetra5A and ditelosomic Dt5DL lines. Pm2, the only other known Pm gene on chromosome 5D, has been mapped to the short arm and its specificity is different from that of Pm34.}, number={8}, journal={THEORETICAL AND APPLIED GENETICS}, author={Miranda, L. M. and Murphy, J. P. and Marshall, D. and Leath, S.}, year={2006}, month={Nov}, pages={1497–1504} }
 @article{marshall_work_cavey_2003, title={Invasion pathways of Karnal bunt of wheat into the United States}, volume={87}, ISSN={["1943-7692"]}, DOI={10.1094/PDIS.2003.87.8.999}, abstractNote={ Karnal bunt of wheat (caused by Tilletia indica) was first detected in the United States in Arizona in 1996. The seed lots of infected, spring-habit, durum wheat associated with the initial detection were traced to planted fields in California, Arizona, New Mexico, and Texas. However, in the summer of 1997, the disease appeared in unrelated, winter-habit, bread wheat located over 700 km from the nearest potentially contaminated wheat from 1996 (and destroyed prior to reinfection). Here, we examined potential invasion pathways of the fungus associated with the movement of wheat into the United States. We analyzed the USDA/APHIS Port Information Network (PIN) database from 1984 through 2000 to determine likely pathways of introduction based on where, when, and how the disease was intercepted coming into the United States. All interceptions were made on wheat transported from Mexico, with the majority (98.8%) being intercepted at land border crossings. Karnal bunt was not intercepted from any other country over the 17-year period analyzed. Most interceptions were on wheat found in automobiles, trucks, and railway cars. The majority of interceptions were made at Laredo, Brownsville, Eagle Pass, and El Paso, TX, and Nogales, AZ. Karnal bunt was intercepted in all 17 years; however, interceptions peaked in 1986 and 1987. Averaged over all years, more interceptions (19.2%) were made in the month of May than in any other month. Our results indicate that Karnal bunt has probably arrived in the United States on many occasions, at least since 1984. Because of the relatively unaggressive nature of the disease and its reliance on rather exacting weather conditions for infection, we surmised that it is possible this disease has a long period of latent survival between initial arrival and becoming a thriving, established disease. }, number={8}, journal={PLANT DISEASE}, author={Marshall, D and Work, TT and Cavey, JF}, year={2003}, month={Aug}, pages={999–1003} }