Genetics of wheat cultivar mixtures

TY - CONF

T1 - Genetics of wheat cultivar mixtures

AU - Kristensen, Peter Skov

AU - Larsen, Anders Søndergaard

AU - Deneken, Gerhard

AU - Nielsen, Bjarne

PY - 2024

Y1 - 2024

N2 - 7th International Conference of Quantitative Genetics Vienna, Austria, 22-26 July 2024 Abstract Title: Genetics of wheat cultivar mixtures Autors: 1Peter Skov Kristensen, 2Anders Søndergård Larsen, 2Gerhard Deneken, 1Bjarne Nielsen 1Center for Quantitative Genetics & Genomics, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse 2TystofteFonden, Teglværksvej 10, DK-4230 Skælskør, Denmark A new project has been started aiming to estimate the genetic correlation between yield of wheat cultivars grown as pure cultivar crop and in cultivar mixtures. We are working with a data set of 35012 yield plots, consisting of 919 different pure wheat cultivars and 31 different mixtures of wheat cultivars, organised in an alpha-design with 4 replicates across 3 to 6 locations per year over the last 20 years. Each year, two identical cultivar mixture plots were included as references in the experiment to test the reliability of the yearly results. In total, the dataset included 943 mixture plots of 3 to 4 wheat cultivars. All data was provided by TystofteFonden, which is the organisation responsible for testing and approval of new cultivars for the Danish market. Since 1994, different combinations of wheat cultivar mixtures have been used as references in the test trials. We estimated a combination of the additive and non-additive genetic effect along with individual line effect from data using a linear mixed regression model. This model included two random yield levels of the individual cultivars, i.e. yield level for growth as a pure cultivar and yield level for growth in cultivar mixtures. Preliminary analysis of yield data shows a phenotypic correlation of 0.98 between pure cultivar growth and cultivar mixtures. For individual wheat cultivars, the additive mixture effect ranged from -0.05 up to 0.13 ton/ha (-0.5 to 1.3 %). On average, the yield level increased by 0.025 ton/ha (0.25%) when cultivars were grown in mixture plots compared to pure cultivar plots. From the data, we estimate an indication of the genetic gain of wheat cultivars to be 0.075 ton/ha/year for the twenty-year time period. In the future, we will include genotyping data of individual wheat cultivars. By combining genotyping data with yield data, we aim to study the genetic architecture for the mixture effects in wheat. Firstly, we will estimate the genetic correlations between yield of cultivars grown in pure cultivar plots and in cultivar mixtures plots. We hypothesize that the additive genetic yield potential for the individual wheat cultivars differs depending on whether they are grown as cultivar mixtures or as pure cultivar crop. Secondly, we will study the non-additive genetic interactions between wheat cultivars of cultivar mixtures plots. Genetics of yield stability and resilience to diseases will also be considered in future analysis from the project.

AB - 7th International Conference of Quantitative Genetics Vienna, Austria, 22-26 July 2024 Abstract Title: Genetics of wheat cultivar mixtures Autors: 1Peter Skov Kristensen, 2Anders Søndergård Larsen, 2Gerhard Deneken, 1Bjarne Nielsen 1Center for Quantitative Genetics & Genomics, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse 2TystofteFonden, Teglværksvej 10, DK-4230 Skælskør, Denmark A new project has been started aiming to estimate the genetic correlation between yield of wheat cultivars grown as pure cultivar crop and in cultivar mixtures. We are working with a data set of 35012 yield plots, consisting of 919 different pure wheat cultivars and 31 different mixtures of wheat cultivars, organised in an alpha-design with 4 replicates across 3 to 6 locations per year over the last 20 years. Each year, two identical cultivar mixture plots were included as references in the experiment to test the reliability of the yearly results. In total, the dataset included 943 mixture plots of 3 to 4 wheat cultivars. All data was provided by TystofteFonden, which is the organisation responsible for testing and approval of new cultivars for the Danish market. Since 1994, different combinations of wheat cultivar mixtures have been used as references in the test trials. We estimated a combination of the additive and non-additive genetic effect along with individual line effect from data using a linear mixed regression model. This model included two random yield levels of the individual cultivars, i.e. yield level for growth as a pure cultivar and yield level for growth in cultivar mixtures. Preliminary analysis of yield data shows a phenotypic correlation of 0.98 between pure cultivar growth and cultivar mixtures. For individual wheat cultivars, the additive mixture effect ranged from -0.05 up to 0.13 ton/ha (-0.5 to 1.3 %). On average, the yield level increased by 0.025 ton/ha (0.25%) when cultivars were grown in mixture plots compared to pure cultivar plots. From the data, we estimate an indication of the genetic gain of wheat cultivars to be 0.075 ton/ha/year for the twenty-year time period. In the future, we will include genotyping data of individual wheat cultivars. By combining genotyping data with yield data, we aim to study the genetic architecture for the mixture effects in wheat. Firstly, we will estimate the genetic correlations between yield of cultivars grown in pure cultivar plots and in cultivar mixtures plots. We hypothesize that the additive genetic yield potential for the individual wheat cultivars differs depending on whether they are grown as cultivar mixtures or as pure cultivar crop. Secondly, we will study the non-additive genetic interactions between wheat cultivars of cultivar mixtures plots. Genetics of yield stability and resilience to diseases will also be considered in future analysis from the project.

M3 - Poster

T2 - 7th International Conference of Quantitative Genetics

Y2 - 22 July 2024 through 26 July 2024

ER -