RQ3C2VBG

2360

11 janvier 2021 14:18

22 janvier 2021 16:56

Effective Population Sizes (Ne) of three winter wheat composite cross populations (CCPs) that had been maintained under organic and conventional conditions from the F7 to the F12 were analysed. The number of plants (N) needed to maintain an Ne of 5000 for each population was calculated based on the mean variation in the number of gametes per parent Sk2. Variability in kernel number per plant was high, leading to large variations in the contribution of single plants to the next generation. Also, N required for an Ne of 5000 individuals was somewhat variable among the CCPs, but changed little from the F7 (mean N of 11,955) to the F9 (mean N 11,854) under the assumption of 2% outcrossing. There was, however, an increase to a mean N of 14,374 between the F9 and the F12, most likely due to an extreme winterkill in the F11. The calculation of N using demographic data can only give general estimations but was well suited to show changes in the populations over time as affected by generation and year. Results show that drift was limited even under disruptive climatic events.

None

• AB - Modalité bio
• density
• FREDO durabilité
• FREDO santé végétale
• GEO Allemagne
• SPECIES Triticum aestivum
• céréale
• plant breeding
• winter wheat

• dynamic management
• effective population size
• evolutionary breeding
• heterogeneous populations
• sustainable agriculture

European Journal of Agronomy

109

125922

September 1, 2019

1 septembre 2019

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