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Positive selection and expression divergence following gene duplication in the sunflower CYCLOIDEA gene family

Positive selection and expression divergence following gene duplication in the sunflower CYCLOIDEA gene family
Positive selection and expression divergence following gene duplication in the sunflower CYCLOIDEA gene family
Members of the CYCLOIDEA (CYC)/TEOSINTE-BRANCHED1 (TB1) group of transcription factors have been implicated in the evolution of zygomorphic (i.e., bilaterally symmetric) flowers in Antirrhinum and Lotus and the loss of branching phenotype during the domestication of maize. The composite inflorescences of sunflower (Helianthus annuus L. Asteraceae) contain both zygomorphic and actinomorphic (i.e., radially symmetric) florets (rays and disks, respectively), and the cultivated sunflower has evolved an unbranched phenotype in response to domestication from its highly branched wild progenitor; hence, genes related to CYC/TB1 are of great interest in this study system. We identified 10 members of the CYC/TB1 gene family in sunflower, which is more than found in any other species investigated to date. Phylogenetic analysis indicates that these genes occur in 3 distinct clades, consistent with previous research in other eudicot species. A combination of dating the duplication events and linkage mapping indicates that only some of the duplications were associated with polyploidization. Cosegregation between CYC-like genes and branching-related quantitative trait loci suggest a minor, if any, role for these genes in conferring differences in branching. However, the expression patterns of one gene suggest a possible role in the development of ray versus disk florets. Molecular evolutionary analyses reveal that residues in the conserved domains were the targets of positive selection following gene duplication. Taken together, these results indicate that gene duplication and functional divergence have played a major role in diversification of the sunflower CYC gene family.
cycloidea, floral development, helianthus, sunflower, teosinte-branched1, transcription factors
1260-1273
Chapman, M.A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Leebens-Mack, J.H.
973901c5-1d98-4ce6-ba32-9c3091bf4830
Burke, J.M.
5110d8b4-546a-4e5d-9fa0-9ae93a818c09
Chapman, M.A.
8bac4a92-bfa7-4c3c-af29-9af852ef6383
Leebens-Mack, J.H.
973901c5-1d98-4ce6-ba32-9c3091bf4830
Burke, J.M.
5110d8b4-546a-4e5d-9fa0-9ae93a818c09

Chapman, M.A., Leebens-Mack, J.H. and Burke, J.M. (2008) Positive selection and expression divergence following gene duplication in the sunflower CYCLOIDEA gene family. Molecular Biology and Evolution, 25 (7), 1260-1273. (doi:10.1093/molbev/msn001). (PMID:18390478)

Record type: Article

Abstract

Members of the CYCLOIDEA (CYC)/TEOSINTE-BRANCHED1 (TB1) group of transcription factors have been implicated in the evolution of zygomorphic (i.e., bilaterally symmetric) flowers in Antirrhinum and Lotus and the loss of branching phenotype during the domestication of maize. The composite inflorescences of sunflower (Helianthus annuus L. Asteraceae) contain both zygomorphic and actinomorphic (i.e., radially symmetric) florets (rays and disks, respectively), and the cultivated sunflower has evolved an unbranched phenotype in response to domestication from its highly branched wild progenitor; hence, genes related to CYC/TB1 are of great interest in this study system. We identified 10 members of the CYC/TB1 gene family in sunflower, which is more than found in any other species investigated to date. Phylogenetic analysis indicates that these genes occur in 3 distinct clades, consistent with previous research in other eudicot species. A combination of dating the duplication events and linkage mapping indicates that only some of the duplications were associated with polyploidization. Cosegregation between CYC-like genes and branching-related quantitative trait loci suggest a minor, if any, role for these genes in conferring differences in branching. However, the expression patterns of one gene suggest a possible role in the development of ray versus disk florets. Molecular evolutionary analyses reveal that residues in the conserved domains were the targets of positive selection following gene duplication. Taken together, these results indicate that gene duplication and functional divergence have played a major role in diversification of the sunflower CYC gene family.

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e-pub ahead of print date: 3 April 2008
Published date: July 2008
Keywords: cycloidea, floral development, helianthus, sunflower, teosinte-branched1, transcription factors
Organisations: Environmental

Identifiers

Local EPrints ID: 350273
URI: https://eprints.soton.ac.uk/id/eprint/350273
PURE UUID: 88bd9182-aba5-4d6e-a045-417068066025
ORCID for M.A. Chapman: ORCID iD orcid.org/0000-0002-7151-723X

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Date deposited: 25 Mar 2013 10:02
Last modified: 05 Nov 2019 01:37

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