Natural selection towards wild-type in composite cross populations of winter wheat

Knapp, S., Doering, T. F., Jones, H. E., Snape, J., Wingen, L. U., Wolfe, M. S., Leverington-Waite, M. and Griffiths, S. (2020) Natural selection towards wild-type in composite cross populations of winter wheat. Frontiers in Plant Science, 10. 1757. ISSN 1664-462X doi: 10.3389/fpls.2019.01757

Abstract/Summary

Most of our crops are grown in monoculture with single genotypes grown over wide acreage. An alternative approach, where segregating populations are used as crops, is an exciting possibility, but outcomes of natural selection upon this type of crop are not well understood. We tracked allelic frequency changes in evolving composite cross populations of wheat grown over ten generations under organic and conventional farming. At three generations, each population was genotyped with 19 SSR and 8 SNP markers. The latter were diagnostic for major functional genes. Gene diversity was constant at SSR markers but decreased over time for SNP markers. Population differentiation between the four locations could not be detected, suggesting that organic vs. non-organic crop management did not drive allele frequency changes. However, we did see changes for genes controlling plant height and phenology in all populations independently and consistently. We interpret these changes as the result of a consistent natural selection towards wild-type. Independent selection for alleles that are associated with plant height suggests that competition for light was central, resulting in the predominance of stronger intraspecific competitors, and highlighting a potential trade-off between individual and population performance

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/89789
Identification Number/DOI	10.3389/fpls.2019.01757
Refereed	Yes
Divisions	Life Sciences > School of Agriculture, Policy and Development > Department of Animal Sciences > Animal, Dairy and Food Chain Sciences (ADFCS)- DO NOT USE
Publisher	Frontiers
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