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Adaptive phenotypic divergence in an annual grass differs across biotic contexts

Anna M O'Brien, Ruairidh J.H. Sawers, Sharon Y Strauss, Jeffrey Ross-Ibarra
doi: https://doi.org/10.1101/382770
Anna M O'Brien
1 University of Toronto, Dept. of Ecology and Evolutionary Biology;
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  • For correspondence: amobrien@ucdavis.edu
Ruairidh J.H. Sawers
2 LANGEBIO, CINVESTAV - IPN;
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  • For correspondence: rusawers@cinvestav.mx
Sharon Y Strauss
3 University of California Davis, Department of Evolution and Ecology;
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  • For correspondence: systrauss@ucdavis.edu
Jeffrey Ross-Ibarra
4 University of California Davis, Department of Plant Sciences, Genome Center
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  • For correspondence: rossibarra@ucdavis.edu
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Abstract

Climate is a powerful force shaping adaptation within species, yet adaptation to climate does not occur in a vacuum: species interactions can filter fitness consequences of genetic variation by altering phenotypic expression of genotypes. We investigated this process using populations of teosinte, a wild annual grass related to maize (Zea mays ssp. mexicana), sampling plants from ten sites along an elevational gradient as well as rhizosphere biota from three of those sites. We grew half-sibling teosinte families in each biota to test whether trait divergence among teosinte populations reflects adaptation or drift, and whether rhizosphere biota affect expression of diverged traits. We further assayed the influence of rhizosphere biota on contemporary additive genetic variation. We found that adaptation across environment shaped divergence of some traits, particularly flowering time and root biomass. We also observed that different rhizosphere biota shifted expressed values of these traits within teosinte populations and families and altered within-population genetic variance and covariance. In sum, our results imply that changes in trait expression and covariance elicited by rhizosphere communities may have played a historical role in teosinte adaptation to environments and that they are likely to continue to play a role in the response to future selection.

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Posted January 03, 2019.
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Adaptive phenotypic divergence in an annual grass differs across biotic contexts
Anna M O'Brien, Ruairidh J.H. Sawers, Sharon Y Strauss, Jeffrey Ross-Ibarra
bioRxiv 382770; doi: https://doi.org/10.1101/382770
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Adaptive phenotypic divergence in an annual grass differs across biotic contexts
Anna M O'Brien, Ruairidh J.H. Sawers, Sharon Y Strauss, Jeffrey Ross-Ibarra
bioRxiv 382770; doi: https://doi.org/10.1101/382770

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