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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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 languageEnglish (US)
Pages (from-to)2230-2246
Number of pages17
JournalEvolution
Volume73
Issue number11
DOIs
StatePublished - Nov 1 2019

Fingerprint

Zea
Poaceae
Zea mays
Biota
Rhizosphere
rhizosphere
biota
divergence
grass
grasses
organisms
genetic variation
Zea mays subsp. mexicana
Climate
climate
genetic covariance
genetic variance
Population
population genetics
flowering

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

Cite this

O'Brien, Anna M. ; Sawers, Ruairidh J.H. ; Strauss, Sharon Y. ; Ross-Ibarra, Jeffrey. / Adaptive phenotypic divergence in an annual grass differs across biotic contexts*. In: Evolution. 2019 ; Vol. 73, No. 11. pp. 2230-2246.
@article{61cc4b4e0ce34a23b7f335e84d431443,
title = "Adaptive phenotypic divergence in an annual grass differs across biotic contexts*",
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.",
author = "O'Brien, {Anna M.} and Sawers, {Ruairidh J.H.} and Strauss, {Sharon Y.} and Jeffrey Ross-Ibarra",
year = "2019",
month = "11",
day = "1",
doi = "10.1111/evo.13818",
language = "English (US)",
volume = "73",
pages = "2230--2246",
journal = "Evolution; international journal of organic evolution",
issn = "0014-3820",
publisher = "Society for the Study of Evolution",
number = "11",

}

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 journalArticle

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 -