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The effect of polyploidy and hybridization on the evolution of floral colour in Nicotiana (Solanaceae)

The effect of polyploidy and hybridization on the evolution of floral colour in Nicotiana (Solanaceae)

McCarthy, Elizabeth W., Arnold, Sarah E.J. ORCID: 0000-0001-7345-0529, Chittka, Lars, Le Comber, Steven C., Verity, Robert, Dodsworth, Steven, Knapp, Sandra, Kelly, Laura J., Chase, Mark W., Baldwin, Ian T., Kovařík, Aleš, Mhiri, Corinne, Taylor, Lin and Leitch, Andrew R. (2015) The effect of polyploidy and hybridization on the evolution of floral colour in Nicotiana (Solanaceae). Annals of Botany, 115 (7). pp. 1117-1131. ISSN 0305-7364 (Print), 1095-8290 (Online) (doi:https://doi.org/10.1093/aob/mcv048)

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Abstract

Background and Aims: We investigate whether changes in floral colour accompany polyploid and homoploid hybridisation, important processes in angiosperm evolution.
Potentially, changes in floral colour can facilitate speciation through pollinator shifts.

Methods: We examined spectral reflectance of corolla tissue from 60 Nicotiana (Solanaceae) accessions (41 taxa) based on spectral shape (corresponding to pigmentation) as well as bee and hummingbird colour perception to assess patterns of floral colour evolution. We compared polyploid and homoploid hybrid spectra to those of their progenitors to evaluate whether hybridisation has resulted in floral
colour shifts.

Key Results: Floral colour categories in Nicotiana seem to have arisen multiple times independently during the evolution of the genus. Polyploid and homoploid hybrids
can display a floral colour: 1) intermediate between progenitors, 2) like one or other progenitor, or 3) a transgressive or divergent colour not present in either progenitor.

Conclusions: Floral colour evolution in Nicotiana is weakly constrained by phylogeny, but colour shifts occur and are sometimes associated with allopolyploid or homoploid speciation. Transgressive floral colour in N. tabacum has arisen by inheritance of anthocyanin pigmentation from its paternal progenitor while having a plastid phenotype like its maternal progenitor. Potentially, floral colour evolution has been driven by, or resulted in, pollinator shifts.

Item Type: Article
Additional Information: [1] Acknowledgement (funding): This work was supported by the Natural Environment Research Council (NE/C511964/1 to A.R.L. and M.W.C.); the Czech Science Foundation [P501/13/10057S to A.K.]; and the Overseas Research Students Awards Scheme to E.W.M. [2] Copyright: (c) The Author 2015. Published by Oxford University Press on behalf of the Annals of Botany Company. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Uncontrolled Keywords: evolution, floral colour, hybridisation, Nicotiana, pollinator shifts, polyploidy, spectral reflectance, transgressive traits
Subjects: Q Science > QH Natural history
Q Science > QK Botany
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Natural Resources Institute
Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department
Related URLs:
Last Modified: 14 May 2019 10:57
Selected for GREAT 2016: GREAT a
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: GREAT 1
URI: http://gala.gre.ac.uk/id/eprint/13251

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