Heritable variation in root bacterial microbiomes alters natural selection on host plants
- 1University of Chicago
Abstract
Heritable variation in microbiome composition could theoretically evolve in response to selection acting on hosts, but empirical evidence of this is scarce. We tested for effects of allelic variation in Boechera stricta on microbiome composition and downstream consequences for host fitness. In the greenhouse, near-isogenic lines with contrasting phytochemistry alleles differentially conditioned soil microbiota in ways that changed the relative fecundity of host genotypes. In the field, root microbiome differences mediated allelic effects on host fitness. Selection gradients on individual taxa and multivariate axes of root microbiome composition suggest that independent components of the bacterial community favor each allele, especially under drought. These results show that microbiota contribute to natural selection on a major-effect phytochemistry gene, empirically closing the loop between microbiome heritability and host trait evolution.
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BibTeX
@misc{carley2026heritable,
title = {{Heritable variation in root bacterial microbiomes alters natural selection on host plants}},
author = {L. N. Carley and A. Simha and E. Bass and A. Carmichael and M. R. Wagner},
howpublished = {bioRxiv},
year = {2026},
month = oct,
doi = {10.64898/2026.10.07.757180},
url = {https://www.biorxiv.org/content/10.64898/2026.10.07.757180v1},
note = {CC BY-NC},
}
RIS
TY - UNPB
TI - Heritable variation in root bacterial microbiomes alters natural selection on host plants
AU - L. N. Carley
AU - A. Simha
AU - E. Bass
AU - A. Carmichael
AU - M. R. Wagner
PY - 2026
DA - 2026/10/07
PB - bioRxiv
DO - 10.64898/2026.10.07.757180
UR - https://www.biorxiv.org/content/10.64898/2026.10.07.757180v1
AB - Heritable variation in microbiome composition could theoretically evolve in response to selection acting on hosts, but empirical evidence of this is scarce. We tested for effects of allelic variation in Boechera stricta on microbiome composition and downstream consequences for host fitness. In the greenhouse, near-isogenic lines with contrasting phytochemistry alleles differentially conditioned soil microbiota in ways that changed the relative fecundity of host genotypes. In the field, root microbiome differences mediated allelic effects on host fitness. Selection gradients on individual taxa and multivariate axes of root microbiome composition suggest that independent components of the bacterial community favor each allele, especially under drought. These results show that microbiota contribute to natural selection on a major-effect phytochemistry gene, empirically closing the loop between microbiome heritability and host trait evolution.
ER -