12 research outputs found

    Tetraploid Wheat Landraces in the Mediterranean Basin: Taxonomy, Evolution and Genetic Diversity

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    The geographic distribution of genetic diversity and the population structure of tetraploid wheat landraces in the Mediterranean basin has received relatively little attention. This is complicated by the lack of consensus concerning the taxonomy of tetraploid wheats and by unresolved questions regarding the domestication and spread of naked wheats. These knowledge gaps hinder crop diversity conservation efforts and plant breeding programmes. We investigated genetic diversity and population structure in tetraploid wheats (wild emmer, emmer, rivet and durum) using nuclear and chloroplast simple sequence repeats, functional variations and insertion site-based polymorphisms. Emmer and wild emmer constitute a genetically distinct population from durum and rivet, the latter seeming to share a common gene pool. Our population structure and genetic diversity data suggest a dynamic history of introduction and extinction of genotypes in the Mediterranean fields

    Measurements of neutrino oscillation parameters from the T2K experiment using 3.6×10213.6\times10^{21} protons on target

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    International audienceThe T2K experiment presents new measurements of neutrino oscillation parameters using 19.7(16.3)×102019.7(16.3)\times10^{20} protons on target (POT) in (anti-)neutrino mode at the far detector (FD). Compared to the previous analysis, an additional 4.7×10204.7\times10^{20} POT neutrino data was collected at the FD. Significant improvements were made to the analysis methodology, with the near-detector analysis introducing new selections and using more than double the data. Additionally, this is the first T2K oscillation analysis to use NA61/SHINE data on a replica of the T2K target to tune the neutrino flux model, and the neutrino interaction model was improved to include new nuclear effects and calculations. Frequentist and Bayesian analyses are presented, including results on sin2θ13\sin^2\theta_{13} and the impact of priors on the δCP\delta_\mathrm{CP} measurement. Both analyses prefer the normal mass ordering and upper octant of sin2θ23\sin^2\theta_{23} with a nearly maximally CP-violating phase. Assuming the normal ordering and using the constraint on sin2θ13\sin^2\theta_{13} from reactors, sin2θ23=0.5610.032+0.021\sin^2\theta_{23}=0.561^{+0.021}_{-0.032} using Feldman--Cousins corrected intervals, and Δm322=2.4940.058+0.041×103 eV2\Delta{}m^2_{32}=2.494_{-0.058}^{+0.041}\times10^{-3}~\mathrm{eV^2} using constant Δχ2\Delta\chi^{2} intervals. The CP-violating phase is constrained to δCP=1.970.70+0.97\delta_\mathrm{CP}=-1.97_{-0.70}^{+0.97} using Feldman--Cousins corrected intervals, and δCP=0,π\delta_\mathrm{CP}=0,\pi is excluded at more than 90% confidence level. A Jarlskog invariant of zero is excluded at more than 2σ2\sigma credible level using a flat prior in δCP\delta_\mathrm{CP}, and just below 2σ2\sigma using a flat prior in sinδCP\sin\delta_\mathrm{CP}. When the external constraint on sin2θ13\sin^2\theta_{13} is removed, sin2θ13=28.06.5+2.8×103\sin^2\theta_{13}=28.0^{+2.8}_{-6.5}\times10^{-3}, in agreement with measurements from reactor experiments. These results are consistent with previous T2K analyses
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