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Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses

Temperate Pooideae are a large clade of economically important grasses distributed in some of the Earth's coldest and driest terrestrial environments. Previous studies have inferred that Pooideae diversified from their tropical ancestors in a cold montane habitat, suggesting that above‐freezing...

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Autores principales: Das, Aayudh, Dedon, Natalie, Enders, Daniel J., Fjellheim, Siri, Preston, Jill C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10107940/
https://www.ncbi.nlm.nih.gov/pubmed/36420966
http://dx.doi.org/10.1111/mec.16794
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author Das, Aayudh
Dedon, Natalie
Enders, Daniel J.
Fjellheim, Siri
Preston, Jill C.
author_facet Das, Aayudh
Dedon, Natalie
Enders, Daniel J.
Fjellheim, Siri
Preston, Jill C.
author_sort Das, Aayudh
collection PubMed
description Temperate Pooideae are a large clade of economically important grasses distributed in some of the Earth's coldest and driest terrestrial environments. Previous studies have inferred that Pooideae diversified from their tropical ancestors in a cold montane habitat, suggesting that above‐freezing cold (chilling) tolerance evolved early in the subfamily. By contrast, drought tolerance is hypothesized to have evolved multiple times independently in response to global aridification that occurred after the split of Pooideae tribes. To independently test predictions of the chilling‐before‐drought hypothesis in Pooideae, we assessed conservation of whole plant and gene expression traits in response to chilling vs. drought. We demonstrated that both trait responses are more similar across tribes in cold as compared to drought, suggesting that chilling responses evolved before, and drought responses after, tribe diversification. Moreover, we found significantly more overlap between drought and chilling responsive genes within a species than between drought responsive genes across species, providing evidence that chilling tolerance genes acted as precursors for the novel acquisition of increased drought tolerance multiple times independently, partially through the cooption of chilling responsive genes.
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spelling pubmed-101079402023-04-18 Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses Das, Aayudh Dedon, Natalie Enders, Daniel J. Fjellheim, Siri Preston, Jill C. Mol Ecol ORIGINAL ARTICLES Temperate Pooideae are a large clade of economically important grasses distributed in some of the Earth's coldest and driest terrestrial environments. Previous studies have inferred that Pooideae diversified from their tropical ancestors in a cold montane habitat, suggesting that above‐freezing cold (chilling) tolerance evolved early in the subfamily. By contrast, drought tolerance is hypothesized to have evolved multiple times independently in response to global aridification that occurred after the split of Pooideae tribes. To independently test predictions of the chilling‐before‐drought hypothesis in Pooideae, we assessed conservation of whole plant and gene expression traits in response to chilling vs. drought. We demonstrated that both trait responses are more similar across tribes in cold as compared to drought, suggesting that chilling responses evolved before, and drought responses after, tribe diversification. Moreover, we found significantly more overlap between drought and chilling responsive genes within a species than between drought responsive genes across species, providing evidence that chilling tolerance genes acted as precursors for the novel acquisition of increased drought tolerance multiple times independently, partially through the cooption of chilling responsive genes. John Wiley and Sons Inc. 2022-12-07 2023-02 /pmc/articles/PMC10107940/ /pubmed/36420966 http://dx.doi.org/10.1111/mec.16794 Text en © 2022 The Authors. Molecular Ecology published by John Wiley & Sons Ltd. https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle ORIGINAL ARTICLES
Das, Aayudh
Dedon, Natalie
Enders, Daniel J.
Fjellheim, Siri
Preston, Jill C.
Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title_full Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title_fullStr Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title_full_unstemmed Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title_short Testing the chilling‐ before drought‐tolerance hypothesis in Pooideae grasses
title_sort testing the chilling‐ before drought‐tolerance hypothesis in pooideae grasses
topic ORIGINAL ARTICLES
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10107940/
https://www.ncbi.nlm.nih.gov/pubmed/36420966
http://dx.doi.org/10.1111/mec.16794
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