The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Richard R Belanger - One of the best experts on this subject based on the ideXlab platform.
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development of a simple hydroponic assay to study vertical and Horizontal Resistance of soybean and pathotypes of phytophthora sojae
Plant Disease, 2018Co-Authors: Amandine Lebreton, Caroline Labbe, M De Ronne, Genevieve Marchand, Richard R BelangerAbstract:Phytophthora root rot, caused by Phytophthora sojae, is one of the most damaging diseases of soybean and the introgression of Rps (Resistance to P. sojae) genes into elite soybean lines is arguably the best way to manage this disease. Current bioassays to phenotype the gene-for-gene relationship are hampered with respect to reproducibility and long-term stability of isolates, and do not accurately predict Horizontal Resistance individually. The aim of our study was to investigate a new way of phenotyping P. sojae isolates and vertical and Horizontal Resistance in soybean that relies on zoospores inoculated directly into a hydroponic system. Inoculation of P. sojae isolates against a set of eight differentials accurately and reproducibly identified pathotypes over a period of two years. When applied to test vertical Resistance of soybean lines with known and unknown Rps genes, the bioassay relied on plant dry weight to correctly identify all genes. In addition, simultaneous inoculations of three P. sojae i...
Amandine Lebreton - One of the best experts on this subject based on the ideXlab platform.
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development of a simple hydroponic assay to study vertical and Horizontal Resistance of soybean and pathotypes of phytophthora sojae
Plant Disease, 2018Co-Authors: Amandine Lebreton, Caroline Labbe, M De Ronne, Genevieve Marchand, Richard R BelangerAbstract:Phytophthora root rot, caused by Phytophthora sojae, is one of the most damaging diseases of soybean and the introgression of Rps (Resistance to P. sojae) genes into elite soybean lines is arguably the best way to manage this disease. Current bioassays to phenotype the gene-for-gene relationship are hampered with respect to reproducibility and long-term stability of isolates, and do not accurately predict Horizontal Resistance individually. The aim of our study was to investigate a new way of phenotyping P. sojae isolates and vertical and Horizontal Resistance in soybean that relies on zoospores inoculated directly into a hydroponic system. Inoculation of P. sojae isolates against a set of eight differentials accurately and reproducibly identified pathotypes over a period of two years. When applied to test vertical Resistance of soybean lines with known and unknown Rps genes, the bioassay relied on plant dry weight to correctly identify all genes. In addition, simultaneous inoculations of three P. sojae i...
F A Van Eeuwijk - One of the best experts on this subject based on the ideXlab platform.
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genotype x strain interactions for Resistance to fusarium head blight caused by fusarium culmorum in winter wheat
Theoretical and Applied Genetics, 1991Co-Authors: C H A Snijders, F A Van EeuwijkAbstract:In 3 consecutive years, a set of 17 winter wheat genotypes, representing a wide range of Fusarium head blight Resistance, was inoculated with four strains of Fusarium culmorum. Fusarium head blight ratings were analyzed. The interaction between genotypes, strains, and years was described using a Finlay-Wilkinson model and an Additive Main effects and Multiplicative Interaction effects (AMMI) model. The interaction consisted primarily of a divergence of genotypical responses with increasing disease pressure, modified by genotype specific reactions in certain years. The divergence was mainly caused by one very pathogenic strain. The Fusarium head blight Resistance in this study can be described as Horizontal Resistance in terms of Vanderplank, with the exception of three genotypes selected from one particular cross that showed a ‘strain-year combination’ dependent Resistance which was ineffective in 1 year.
Istvan Rajcan - One of the best experts on this subject based on the ideXlab platform.
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qtl associated with Horizontal Resistance to soybean cyst nematode in glycine soja pi464925b
Theoretical and Applied Genetics, 2007Co-Authors: Shawn M J Winter, Barry J Shelp, T R Anderson, T W Welacky, Istvan RajcanAbstract:Soybean cyst nematode (Heterodera glycines Ichinohe; SCN) is the primary disease responsible for yield loss of soybean [Glycine max (L.) Merr.]. Resistant cultivars are an effective management tool; however, the sources currently available have common resistant genes. Glycine soja Sieb. and Zucc., the wild ancestor of domesticated soybean, represents a diverse germplasm pool with known SCN Resistance. The objectives of this research were to: (1) determine the genetic variation and inheritance of SCN Resistance in a G. max (‘S08-80’) × G. soja (PI464925B) F4:5 recombinant inbred line (RIL) population; and (2) identify and evaluate quantitative trait loci (QTL) associated with SCN Resistance. Transgressive segregation for Resistance was observed, although neither parent was resistant to the Chatham and Ruthven SCN isolates. Broad sense heritability was 0.81 for the Ruthven and 0.91 for the Chatham isolate. Root dry weight was a significant covariate that influenced cyst counts. One RIL [female index (FI) = 5.2 ± 1.11] was identified as resistant to the Chatham isolate (FI < 10). Seventeen and three RILs infected with Chatham and Ruthven isolates, respectively, had mean adjusted cyst counts of zero. Unique and novel QTL, which derived Resistance from G. soja, were identified on linkage groups I, K, and O, and individually explained 8, 7 and 5% (LOD = 2.1–2.7) of the total phenotypic variation, respectively. Significant epistatic interactions were found between pairs of SSR markers that individually may or may not have been associated with SCN Resistance, which explained between 10 and 15% of the total phenotypic variation. Best-fit regression models explained 21 and 31% of the total phenotypic variation in the RIL population to the Chatham and Ruthven isolates, respectively. The results of this study help to improve the understanding of the genetic control of SCN Resistance in soybean caused by minor genes resulting in Horizontal Resistance. The incorporation of the novel Resistance QTL from G. soja could increase the durability of SCN-Resistance in soybean cultivars, especially if major gene Resistance breaks down.
M De Ronne - One of the best experts on this subject based on the ideXlab platform.
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development of a simple hydroponic assay to study vertical and Horizontal Resistance of soybean and pathotypes of phytophthora sojae
Plant Disease, 2018Co-Authors: Amandine Lebreton, Caroline Labbe, M De Ronne, Genevieve Marchand, Richard R BelangerAbstract:Phytophthora root rot, caused by Phytophthora sojae, is one of the most damaging diseases of soybean and the introgression of Rps (Resistance to P. sojae) genes into elite soybean lines is arguably the best way to manage this disease. Current bioassays to phenotype the gene-for-gene relationship are hampered with respect to reproducibility and long-term stability of isolates, and do not accurately predict Horizontal Resistance individually. The aim of our study was to investigate a new way of phenotyping P. sojae isolates and vertical and Horizontal Resistance in soybean that relies on zoospores inoculated directly into a hydroponic system. Inoculation of P. sojae isolates against a set of eight differentials accurately and reproducibly identified pathotypes over a period of two years. When applied to test vertical Resistance of soybean lines with known and unknown Rps genes, the bioassay relied on plant dry weight to correctly identify all genes. In addition, simultaneous inoculations of three P. sojae i...