Abstract
Climate is a powerful force shaping adaptation within species, yet adaptation to climate occurs against a biotic background: 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 10 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 could have played a historical role in teosinte adaptation to environments and that they are likely to play a role in the response to future selection.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2230-2246 |
| Number of pages | 17 |
| Journal | Evolution |
| Volume | 73 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 1 2019 |
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All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics
- Genetics
- Agricultural and Biological Sciences(all)
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Adaptive phenotypic divergence in an annual grass differs across biotic contexts*. / O'Brien, Anna M.; Sawers, Ruairidh J.H.; Strauss, Sharon Y.; Ross-Ibarra, Jeffrey.
In: Evolution, Vol. 73, No. 11, 01.11.2019, p. 2230-2246.Research output: Contribution to journal › Article
TY - JOUR
T1 - Adaptive phenotypic divergence in an annual grass differs across biotic contexts*
AU - O'Brien, Anna M.
AU - Sawers, Ruairidh J.H.
AU - Strauss, Sharon Y.
AU - Ross-Ibarra, Jeffrey
PY - 2019/11/1
Y1 - 2019/11/1
N2 - Climate is a powerful force shaping adaptation within species, yet adaptation to climate occurs against a biotic background: 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 10 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 could have played a historical role in teosinte adaptation to environments and that they are likely to play a role in the response to future selection.
AB - Climate is a powerful force shaping adaptation within species, yet adaptation to climate occurs against a biotic background: 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 10 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 could have played a historical role in teosinte adaptation to environments and that they are likely to play a role in the response to future selection.
UR - http://www.scopus.com/inward/record.url?scp=85071108981&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071108981&partnerID=8YFLogxK
U2 - 10.1111/evo.13818
DO - 10.1111/evo.13818
M3 - Article
C2 - 31389004
AN - SCOPUS:85071108981
VL - 73
SP - 2230
EP - 2246
JO - Evolution; international journal of organic evolution
JF - Evolution; international journal of organic evolution
SN - 0014-3820
IS - 11
ER -