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  • 1
    Online Resource
    Online Resource
    Regions of the Genome that Affect Agronomic Performance in Two‐Row Barley
    Wiley ; 1996
    In:  Crop Science Vol. 36, No. 4 ( 1996-07), p. 1053-1062
    Details
    In: Crop Science, Wiley, Vol. 36, No. 4 ( 1996-07), p. 1053-1062
    Abstract: Quantitative trait locus (QTL) main effects and QTL by environment (QTL × E) interactions for seven agronomic traits (grain yield, days to heading, days to maturity, plant height, lodging severity, kernel weight, and test weight) were investigated in a two‐row barley ( Hordeum vulgare L.) cross, Harrington/TR306. A 127‐point base map was constructed from markers (mostly RFLP) scored in 146 random double‐haploid (DH) lines from the Harrington/TR306 cross. Field experiments involving the two parents and 145 random DH lines were grown in 1992 and/or 1993 at 17 locations in North America. Analysis of QTL was based on simple and composite interval mapping. Primary QTL were declared at positions where both methods gave evidence for QTL. The number of primary QTL ranged from three to six per trait, collectively explaining 34 to 52% of the genetic variance. None of these primary QTL showed major effects, but many showed effects that were consistent across environments. The addition of secondary QTL gave models that explained 39 to 80% of the genetic variance. The QTL were dispersed throughout the barley genome and some were detected in regions where QTL have been found in previous studies. Eight chromosome regions contained pleiotropic loci and/or linked clusters of loci that affected multiple traits. One region on chromosome 7 affected all traits except days to heading. This study was an intensive effort to evaluate QTL in a narrow‐base population grown in a large set of environments. The results reveal the types and distributions of QTL effects manipulated by plant breeders and provide opportunities for future testing of marker‐assisted selection.
    Type of Medium: Online Resource
    ISSN: 0011-183X , 1435-0653
    URL: Article
    DOI: 10.2135/cropsci1996.0011183X003600040040x
    Language: English
    Publisher: Wiley
    Publication Date: 1996
    detail.hit.zdb_id: 1480918-7
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  • 2
    Online Resource
    Online Resource
    A molecular, isozyme and morphological map of the barley (Hordeum vulgare) genome
    Springer Science and Business Media LLC ; 1993
    In:  Theoretical and Applied Genetics Vol. 86, No. 6 ( 1993-7), p. 705-712
    Details
    In: Theoretical and Applied Genetics, Springer Science and Business Media LLC, Vol. 86, No. 6 ( 1993-7), p. 705-712
    Type of Medium: Online Resource
    ISSN: 0040-5752 , 1432-2242
    URL: Article
    DOI: 10.1007/BF00222660
    RVK:
    WA 15000
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 1993
    detail.hit.zdb_id: 1478966-8
    SSG: 12
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  • 3
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    Online Resource
    Candidate Gene Sequence Analyses toward Identifying Rsv3 ‐Type Resistance to Soybean Mosaic Virus
    Wiley ; 2016
    In:  The Plant Genome Vol. 9, No. 2 ( 2016-07)
    Details
    In: The Plant Genome, Wiley, Vol. 9, No. 2 ( 2016-07)
    Abstract: Rsv3 is one of three genetic loci conferring strain‐specific resistance to Soybean mosaic virus (SMV). The Rsv3 locus has been mapped to a 154‐kb region on chromosome 14, containing a cluster of five nucleotide‐binding leucine‐rich repeat (NB‐LRR) resistance genes. High sequence similarity between the Rsv3 candidate genes challenges fine mapping of the locus. Among the five, Glyma14g38533 showed the highest transcript abundance in 1 to 3 h of SMV‐G7 inoculation. Comparative sequence analyses were conducted with the five Rsv3 candidate NB‐LRR genes from susceptible ( rsv ‐type) soybean [ Glycine max (L.) Merr.] cultivar Williams 82, resistant ( Rsv3 ‐type) cultivar Hwangkeum, and resistant lines L29 and RRR. Sequence comparisons revealed that Glyma14g38533 had far more polymorphisms than the other candidate genes. Interestingly, Glyma14g38533 gene from Rsv3 ‐type lines exhibited 150 single‐nucleotide polymorphism (SNP and six insertion–deletion (InDel) markers relative to rsv ‐type line, Furthermore, the polymorphisms identified in three Rsv3 ‐type lines were highly conserved. Several polymorphisms were validated in 18 Rsv3 ‐type resistant and six rsv ‐type susceptible lines and were found associated with their disease response. The majority of the polymorphisms were located in LRR domain encoding region, which is involved in pathogen recognition via protein–protein interactions. These findings associating Glyma14g38533 with Rsv3 ‐type resistance to SMV suggest it is the most likely candidate gene for Rsv3 .
    Type of Medium: Online Resource
    ISSN: 1940-3372 , 1940-3372
    URL: Article
    DOI: 10.3835/plantgenome2015.09.0088
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 2440458-5
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  • 4
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    Online Resource
    Recombination Within a Nucleotide-Binding-Site/Leucine-Rich-Repeat Gene Cluster Produces New Variants Conditioning Resistance to Soybean Mosaic Virus in Soybeans
    Oxford University Press (OUP) ; 2004
    In:  Genetics Vol. 166, No. 1 ( 2004-01-01), p. 493-503
    Details
    In: Genetics, Oxford University Press (OUP), Vol. 166, No. 1 ( 2004-01-01), p. 493-503
    Abstract: The soybean Rsv1 gene for resistance to soybean mosaic virus (SMV; Potyvirus) has previously been described as a single-locus multi-allelic gene mapping to molecular linkage group (MLG) F. Various Rsv1 alleles condition different responses to the seven (G1–G7) described strains of SMV, including extreme resistance, localized and systemic necrosis, and mosaic symptoms. We describe the cloning of a cluster of NBS-LRR resistance gene candidates from MLG F of the virus-resistant soybean line PI96983 and demonstrate that multiple genes within this cluster interact to condition unique responses to SMV strains. In addition to cloning 3gG2, a strong candidate for the major Rsv1 resistance gene from PI96983, we describe various unique resistant and necrotic reactions coincident with the presence or absence of other members of this gene cluster. Responses of recombinant lines from a high-resolution mapping population of PI96983 (resistant) × Lee 68 (susceptible) demonstrate that more than one gene in this region of the PI96983 chromosome conditions resistance and/or necrosis to SMV. In addition, the soybean cultivars Marshall and Ogden, which carry other previously described Rsv1 alleles, are shown to possess the 3gG2 gene in a NBS-LRR gene cluster background distinct from PI96983. These observations suggest that two or more related non-TIR-NBS-LRR gene products are likely involved in the allelic response of several Rsv1-containing lines to SMV.
    Type of Medium: Online Resource
    ISSN: 1943-2631
    URL: Article
    DOI: 10.1534/genetics.166.1.493
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2004
    detail.hit.zdb_id: 1477228-0
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  • 5
    Online Resource
    Online Resource
    Soybean mosaic virus : a successful potyvirus with a wide distribution but restricted natural host range
    Wiley ; 2018
    In:  Molecular Plant Pathology Vol. 19, No. 7 ( 2018-07), p. 1563-1579
    Details
    In: Molecular Plant Pathology, Wiley, Vol. 19, No. 7 ( 2018-07), p. 1563-1579
    Abstract: Soybean mosaic virus (SMV) is a species within the genus Potyvirus , family Potyviridae , which includes almost one‐quarter of all known plant RNA viruses affecting agriculturally important plants. The Potyvirus genus is the largest of all genera of plant RNA viruses with 160 species. Particle The filamentous particles of SMV, typical of potyviruses, are about 7500 Å long and 120 Å in diameter with a central hole of about 15 Å in diameter. Coat protein residues are arranged in helices of about 34 Å pitch having slightly less than nine subunits per turn. Genome The SMV genome consists of a single‐stranded, positive‐sense, polyadenylated RNA of approximately 9.6 kb with a virus‐encoded protein (VPg) linked at the 5′ terminus. The genomic RNA contains a single large open reading frame (ORF). The polypeptide produced from the large ORF is processed proteolytically by three viral‐encoded proteinases to yield about 10 functional proteins. A small ORF, partially overlapping the P3 cistron, pipo , is encoded as a fusion protein in the N‐terminus of P3 (P3N + PIPO). Biological properties SMV's host range is restricted mostly to two plant species of a single genus: Glycine max (cultivated soybean) and G. soja (wild soybean). SMV is transmitted by aphids non‐persistently and by seeds. The variability of SMV is recognized by reactions on cultivars with dominant resistance ( R ) genes. Recessive resistance genes are not known. Geographical distribution and economic importance As a consequence of its seed transmissibility, SMV is present in all soybean‐growing areas of the world. SMV infections can reduce significantly seed quantity and quality (e.g. mottled seed coats, reduced seed size and viability, and altered chemical composition). Control The most effective means of managing losses from SMV are the planting of virus‐free seeds and cultivars containing single or multiple R genes. Key attractions The interactions of SMV with soybean genotypes containing different dominant R genes and an understanding of the functional role(s) of SMV‐encoded proteins in virulence, transmission and pathogenicity have been investigated intensively. The SMV–soybean pathosystem has become an excellent model for the examination of the genetics and genomics of a uniquely complex gene‐for‐gene resistance model in a crop of worldwide importance.
    Type of Medium: Online Resource
    ISSN: 1464-6722 , 1364-3703
    URL: Issue
    URL: Article
    DOI: 10.1111/mpp.2018.19.issue-7
    DOI: 10.1111/mpp.12644
    Language: English
    Publisher: Wiley
    Publication Date: 2018
    detail.hit.zdb_id: 2020755-4
    SSG: 12
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  • 6
    Online Resource
    Online Resource
    Molecular Mapping of Leaf Rust Resistance Gene Rph 5 in Barley
    Wiley ; 2003
    In:  Crop Science Vol. 43, No. 1 ( 2003-01), p. 388-393
    Details
    In: Crop Science, Wiley, Vol. 43, No. 1 ( 2003-01), p. 388-393
    Abstract: Leaf rust caused by Puccinia hordei G. Otth is an important disease of barley ( Hordeum vulgare L.) in many regions of the world. Yield losses up to 32% have been reported in susceptible cultivars. The Rph 5 gene confers resistance to the most prevalent races (8 and 30) of barley leaf rust in the USA. Therefore, the molecular mapping of Rph 5 is of great interest. The objectives of this study were to map Rph 5 and identify closely linked molecular markers. Genetic studies were performed by analysis of 93 and 91 F 2 plants derived from the crosses ‘Bowman’ ( rph 5) × ‘Magnif 102’ ( Rph 5) and ‘Moore’ ( rph 5) × Virginia 92‐42‐46 ( Rph 5), respectively. Bulk segregant analysis (BSA) using amplified fragment length polymorphism (AFLP), restriction fragment length polymorphism (RFLP), and simple sequence repeat (SSR) markers was conducted. Linkage analysis positioned the Rph 5 locus to the extreme telomeric region of the short arm of barley chromosome 3H at 0.2 centimorgans (cM) proximal to RFLP marker VT1 and 0.5 cM distal from RFLP marker C970 in the Bowman × Magnif 102 population. Map positions and the relative order of the markers were confirmed in the Moore × Virginia 92‐42‐46 population. RFLP analysis of the near isogenic line (NIL) Magnif 102/*8Bowman, the susceptible recurrent parent Bowman, and Rph 5 donor Magnif 102, confirmed the close linkage of the markers VT1 , BCD907 , and CDO549 to Rph 5. Results from this study will be useful for marker‐assisted selection and gene pyramiding in programs breeding for leaf rust resistance and provide the basis for physical mapping and further cloning activities.
    Type of Medium: Online Resource
    ISSN: 0011-183X , 1435-0653
    URL: Article
    DOI: 10.2135/cropsci2003.3880
    Language: English
    Publisher: Wiley
    Publication Date: 2003
    detail.hit.zdb_id: 1480918-7
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  • 7
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    Online Resource
    Mapping Quantitative Trait Loci for Partial Resistance to Phytophthora sojae in a Soybean Interspecific Cross
    Wiley ; 2010
    In:  Crop Science Vol. 50, No. 2 ( 2010-03), p. 628-635
    Details
    In: Crop Science, Wiley, Vol. 50, No. 2 ( 2010-03), p. 628-635
    Abstract: Phytophthora root and stem rot of soybean, caused by Phytophthora sojae Kaufmann & Gerdemann, is a serious limitation to soybean [ Glycine max (L.) Merr.] production in the USA. Partial resistance or field resistance to P. sojae in soybean is effective against multiple races of the pathogen and is a form of incomplete resistance. An interspecific recombinant inbred line (RIL) population consisting of 298 individuals derived from the cross of V71–370 by PI407162 was inoculated with the P. sojae isolate C2S1 using the slant board technique in three separate experiments (designated as 2005, 2006a, and 2006b). In each replication, seven day old seedlings from each RIL were inoculated and lesion lengths were recorded 7 d later to assess partial resistance with three replications for the 2005 and 2006a experiments and one replication for the 2006b screening. Interval mapping located a lesion length QTL on each of the molecular linkage groups (MLGs)–J (chrom. 16),‐I (chrom. 20) and–G (chrom. 18) in all three experiments. The lesion length QTL on MLG‐J accounted for 32, 42, and 22% of the phenotypic variation in the 2005, 2006a and 2006b experiments, respectively. Mapped QTL locations in the current study provide breeders with new sources of P. sojae resistance and suggest that new sources may be identified in soybean germplasm.
    Type of Medium: Online Resource
    ISSN: 0011-183X , 1435-0653
    URL: Article
    DOI: 10.2135/cropsci2009.03.0161
    Language: English
    Publisher: Wiley
    Publication Date: 2010
    detail.hit.zdb_id: 1480918-7
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  • 8
    Online Resource
    Online Resource
    Experimental Adaptation of an RNA Virus Mimics Natural Evolution
    American Society for Microbiology ; 2011
    In:  Journal of Virology Vol. 85, No. 6 ( 2011-03-15), p. 2557-2564
    Details
    In: Journal of Virology, American Society for Microbiology, Vol. 85, No. 6 ( 2011-03-15), p. 2557-2564
    Abstract: Identification of virulence determinants of viruses is of critical importance in virology. In search of such determinants, virologists traditionally utilize comparative genomics between a virulent and an avirulent virus strain and construct chimeras to map their locations. Subsequent comparison reveals sequence differences, and through analyses of site-directed mutants, key residues are identified. In the absence of a naturally occurring virulent strain, an avirulent strain can be functionally converted to a virulent variant via an experimental evolutionary approach. However, the concern remains whether experimentally evolved virulence determinants mimic those that have evolved naturally. To provide a direct comparison, we exploited a plant RNA virus, soybean mosaic virus (SMV), and its natural host, soybean. Through a serial in vivo passage experiment, the molecularly cloned genome of an avirulent SMV strain was converted to virulent variants on functionally immune soybean genotypes harboring resistance factor(s) from the complex Rsv1 locus. Several of the experimentally evolved virulence determinants were identical to those discovered through a comparative genomic approach with a naturally evolved virulent strain. Thus, our observations validate an experimental evolutionary approach to identify relevant virulence determinants of an RNA virus.
    Type of Medium: Online Resource
    ISSN: 0022-538X , 1098-5514
    URL: Article
    DOI: 10.1128/JVI.01935-10
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2011
    detail.hit.zdb_id: 1495529-5
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  • 9
    Online Resource
    Online Resource
    Confirmation of Three Quantitative Trait Loci Conferring Adult Plant Resistance to Powdery Mildew in Two Winter Wheat Populations
    Springer Science and Business Media LLC ; 2007
    In:  Euphytica Vol. 155, No. 1-2 ( 2007-05), p. 1-13
    Details
    In: Euphytica, Springer Science and Business Media LLC, Vol. 155, No. 1-2 ( 2007-05), p. 1-13
    Type of Medium: Online Resource
    ISSN: 0014-2336 , 1573-5060
    URL: Article
    DOI: 10.1007/s10681-006-9295-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2007
    detail.hit.zdb_id: 2012322-X
    SSG: 12
    SSG: 21
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  • 10
    Online Resource
    Online Resource
    A Method for Combining Isolates of Phytophthora sojae to Screen for Novel Sources of Resistance to Phytophthora Stem and Root Rot in Soybean
    Scientific Societies ; 2016
    In:  Plant Disease Vol. 100, No. 7 ( 2016-07), p. 1424-1428
    Details
    In: Plant Disease, Scientific Societies, Vol. 100, No. 7 ( 2016-07), p. 1424-1428
    Abstract: Soybean cultivars with specific single resistance genes (Rps) are grown to reduce yield loss due to Phytophthora stem and root rot caused by the oomycete pathogen Phytophthora sojae. To identify novel Rps loci, soybean lines are often screened several times, each time with an isolate of P. sojae that differs in virulence on various Rps genes. The goal of this study was to determine whether several isolates of P. sojae that differ in virulence on Rps genes could be combined into a single source of inoculum and used to screen soybean lines for novel Rps genes. A set of 14 soybean differential lines, each carrying a specific Rps gene, was inoculated with three isolates of P. sojae, which differed in virulence on 6 to 10 Rps genes, individually or in a 1:1:1 mixture. Inoculum containing the 1:1:1 mixture of isolates was virulent on 13 Rps genes. The mixed-inoculum method was used to screen 1,019 soybean accessions in a blind assay for novel sources of resistance. In all, 17% of Glycine max accessions and 11% of G. soja accessions were resistant (≤30% dead plants), suggesting that these accessions may carry a novel Rps gene or genes. Advantages of combining isolates into a single source of inoculum include reduced cost, ability to screen soybean germplasm with inoculum virulent on all known Rps genes, and ease of identifying novel sources of resistance. This study is a precursor to identifying novel sources of resistance to P. sojae in soybean using RXLR effectors.
    Type of Medium: Online Resource
    ISSN: 0191-2917 , 1943-7692
    URL: Article
    DOI: 10.1094/PDIS-08-15-0916-RE
    Language: English
    Publisher: Scientific Societies
    Publication Date: 2016
    detail.hit.zdb_id: 2042679-3
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