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Communication Dans Un Congrès Année : 2018

Twenty years of divergent selection for flowering time from maize inbred lines

Résumé

Ongoing Divergent Selection Experiments (DSEs) for flowering time are performed under agronomical conditions in Plateau de Saclay for more than twenty generations. Initial populations consisted in two seed lots, each from a single inbred line, and reproduction was selfing. Selecting each year for early and late flowering from such narrow genetic diversity, we created an evolved plant material likely to be enriched in (epi)genetic differences related to flowering time, while preserving the original characteristics of the initial inbreds. Comparisons among generations allow investigating the dynamics of response to selection. Comparisons between Early and Late populations allow investigating the genotype-phenotype map. Comparisons between Early or between Late populations allow investigating convergence.
Altogether, we observed a significant response to selection in both directions (0.5 days/year on average), with strikingly similar patterns for both DSEs (Durand et al, BMC Evol Biol, 2015). A revised version of the animal model that explicitly accounts for the role of new mutations showed that both residual heterozygosity and new mutations contributed to the dynamics of selection response.
Early and Late progenitors from generation G13 and G18 were used to perform in-depth characterization of plants growth and development. Differences between Early and Late genotypes mainly concern the timing of developmental transitions like flowering transition, while organs’ growth rates and phylochron were much less variable. RNA-Seq analyses on shoot apical meristem extracts revealed hundreds of genes differently expressed between genotypes, especially during floral transition. Altogether, convergence and divergence for flowering time was achieved through different developmental routes in the different populations. Using Lepidoptera stem borers as a model, we also analysed how plant phenology shifts interfere with pathogen life-cycles.
The plant material that was created can be used to predict the effects of environmental changes on agronomical species, including interactions between organisms.
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Dates et versions

hal-04458116 , version 1 (14-02-2024)

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  • HAL Id : hal-04458116 , version 1

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Christine Dillmann, Adrienne Ressayre, Elodie Marchadier, Alain Charcosset, Inoussa Sanané, et al.. Twenty years of divergent selection for flowering time from maize inbred lines. 60th Annual Maize Genetics Conference, MaizeGDB.org, Mar 2018, Saint Malo (FR), France. ⟨hal-04458116⟩
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