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Poster communications

Multi-scale modeling of sunflower crop responses to genetic and environment variations

Abstract : Current research in genomics and ecophysiology strive to improve genetophenotype predictions beyond methods based solely on genetic information such as whole genome prediction (WGP). Predictive approaches coupling quantitative genetics and crop modeling are designed, either with an emphasis on ecophysiology or on statistics, according to the modeling scale of traits: from molecular to crop level (BustosKorts et al., 2016). Genetophenotype predictions are generally carried to predict the breeding values from genomewide information using statistical models. The difficulty with this method lies in the prediction of nonadditive gene effect and genebyenvironment interactions. Crop simulation models, by representing dynamic responses of crop and soil processes to the environment, are successfully used to predict phenotypic plasticity for agronomical traits (Chenu et al., 2017). Therefore, coupling quantitative genetics and processbased modeling should improve the accuracy of breeding value prediction, with different options depending on the phenotypic distance, as illustrated by Hammer et al. (2016). This study aims to predict the performance of a panel of sunflower hybrids in different farming environments, and therefore to identify the most promising genotypes and key physiological traits controlling yield stability and adaptation to future climatic scenarios. Our multiscale modeling strategy proceeded in two steps: (1) building whole genome prediction models to predict a set of component traits as a function of allelic combination of genotypes and (2) predicting the hybrid yield as a function of component traits, environmental variables and management practices using a crop simulation model (Casadebaig et al., 2016). We evaluated the accuracy of this multiscale model on a multienvironmental network (13 environments) where the training population was phenotyped and on independent trials with nonobserved genotypes and environments (9 environments). Over these 22 environments, we found that the overall accuracy of our multiscale model was worse than the accuracy of a single genomic prediction model fitted for crop yield. The WGP model showed a good accuracy on the training environments and on the test environments including hybrids selected for their yield range. However, the multiscale model showed a better accuracy than the WGP model in 4 out 9 test environments, specifically when tested hybrids were not selected for their extreme yield levels. Overall, we identified new bottlenecks related to the design of combined crop and genetic models, such as the definition of component traits articulating genomic and ecophysiological models and the environment(s) used to train the genomic models. …/…
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Poster communications
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https://hal.inrae.fr/hal-02956666
Contributor : Pierre Casadebaig <>
Submitted on : Saturday, October 3, 2020 - 11:13:10 AM
Last modification on : Wednesday, May 12, 2021 - 8:15:31 AM
Long-term archiving on: : Monday, January 4, 2021 - 6:42:43 PM

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Gosseau Florie, Fanny Bonnafous, Prune Pégot-Espagnet, Brigitte Mangin, Nicolas Langlade, et al.. Multi-scale modeling of sunflower crop responses to genetic and environment variations. Second International Crop Modelling Symposium : iCROPM 2020, Feb 2020, Montpellier, France. ⟨hal-02956666⟩

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