In the course of breeding, a number of genetic resources have been used to investigate the effect... more In the course of breeding, a number of genetic resources have been used to investigate the effect of the overexpressed allelic form of the Bx7 high molecular weight glutenin encoded by Glu-B1 on dough strength, stability and extensibility. Biochemical marker selection was carried out using RP-HPLC on breeding lines in the F3 –F4 and F5 –F7 generations, developed using parental
Genomic prediction of agronomic traits as targets for selection in plant breeding programmes is i... more Genomic prediction of agronomic traits as targets for selection in plant breeding programmes is increasingly common. The methods employed can also be applied to predict traits from other sources of covariates, such as metabolomics. However, prediction combining sets of covariates can be less accurate than using the best of the individual sets. We describe a method, termed Differentially Penalized Regression (DiPR), which uses standard ridge regression software to combine sets of covariates while applying independent penalties to each. In a dataset of wheat varieties, field traits are better predicted, on average, by seed metabolites than by genetic markers, but DiPR using both sets of predictors is best. DiPR is a simple and accessible method of using existing software to combine multiple sets of covariates in trait prediction when there are more predictors than observations and the contribution to accuracy from each set differs.
Free asparagine in cereals is known to be the precursor of acrylamide, a neurotoxic and carcinoge... more Free asparagine in cereals is known to be the precursor of acrylamide, a neurotoxic and carcinogenic product formed during cooking processes. Thus, the development of crops with lower asparagine is of considerable interest to growers and the food industry. In this study, we describe the development and application of a rapid (1) H-NMR-based analysis of cereal flour, that is, suitable for quantifying asparagine levels, and hence acrylamide-forming potential, across large numbers of samples. The screen was applied to flour samples from 150 bread wheats grown at a single site in 2005, providing the largest sample set to date. Additionally, screening of 26 selected cultivars grown for two further years in the same location and in three additional European locations in the third year (2007) provided six widely different environments to allow estimation of the environmental (E) and G x E effects on asparagine levels. Asparagine concentrations in the 150 genotypes ranged from 0.32 to 1.56 ...
Important microevolutional processes have taken place in the wheatpowdery mildew population over ... more Important microevolutional processes have taken place in the wheatpowdery mildew population over the last thirty years. There has been aconsiderable change in the race composition of the pathogen populationand in the prevalent races. Of the 78 races identified, only eleven have`lived' for more than 15 years. Many races were only isolated in one ortwo years. The number of virulence genes
Bánkúti 1201, an old Hungarian cultivar represents a mix-ture of genotypes differing in storage p... more Bánkúti 1201, an old Hungarian cultivar represents a mix-ture of genotypes differing in storage protein composi-tions at all three loci. One of the most remarkable things about this variety is that it has subunits 2+12 [1, 3-5] or 3+12 [6] on chromosome 1D, yet has excellent techno- ...
In the course of breeding, a number of genetic resources have been used to investigate the effect... more In the course of breeding, a number of genetic resources have been used to investigate the effect of the overexpressed allelic form of the Bx7 high molecular weight glutenin encoded by Glu-B1 on dough strength, stability and extensibility. Biochemical marker selection was carried out using RP-HPLC on breeding lines in the F3 –F4 and F5 –F7 generations, developed using parental
Genomic prediction of agronomic traits as targets for selection in plant breeding programmes is i... more Genomic prediction of agronomic traits as targets for selection in plant breeding programmes is increasingly common. The methods employed can also be applied to predict traits from other sources of covariates, such as metabolomics. However, prediction combining sets of covariates can be less accurate than using the best of the individual sets. We describe a method, termed Differentially Penalized Regression (DiPR), which uses standard ridge regression software to combine sets of covariates while applying independent penalties to each. In a dataset of wheat varieties, field traits are better predicted, on average, by seed metabolites than by genetic markers, but DiPR using both sets of predictors is best. DiPR is a simple and accessible method of using existing software to combine multiple sets of covariates in trait prediction when there are more predictors than observations and the contribution to accuracy from each set differs.
Free asparagine in cereals is known to be the precursor of acrylamide, a neurotoxic and carcinoge... more Free asparagine in cereals is known to be the precursor of acrylamide, a neurotoxic and carcinogenic product formed during cooking processes. Thus, the development of crops with lower asparagine is of considerable interest to growers and the food industry. In this study, we describe the development and application of a rapid (1) H-NMR-based analysis of cereal flour, that is, suitable for quantifying asparagine levels, and hence acrylamide-forming potential, across large numbers of samples. The screen was applied to flour samples from 150 bread wheats grown at a single site in 2005, providing the largest sample set to date. Additionally, screening of 26 selected cultivars grown for two further years in the same location and in three additional European locations in the third year (2007) provided six widely different environments to allow estimation of the environmental (E) and G x E effects on asparagine levels. Asparagine concentrations in the 150 genotypes ranged from 0.32 to 1.56 ...
Important microevolutional processes have taken place in the wheatpowdery mildew population over ... more Important microevolutional processes have taken place in the wheatpowdery mildew population over the last thirty years. There has been aconsiderable change in the race composition of the pathogen populationand in the prevalent races. Of the 78 races identified, only eleven have`lived' for more than 15 years. Many races were only isolated in one ortwo years. The number of virulence genes
Bánkúti 1201, an old Hungarian cultivar represents a mix-ture of genotypes differing in storage p... more Bánkúti 1201, an old Hungarian cultivar represents a mix-ture of genotypes differing in storage protein composi-tions at all three loci. One of the most remarkable things about this variety is that it has subunits 2+12 [1, 3-5] or 3+12 [6] on chromosome 1D, yet has excellent techno- ...
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Papers by Zoltan Bedo