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Molecular phylogenetics of Euploca (Boraginaceae): homoplasy in many characters, including the C photosynthetic pathway

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Date
18/01/2022
Author
Frohlich, Michael W.
Sage, Rowan F.
Craven, Lyn A.
Schuster, Sebastian
Gigot, Guillaume
Hilger, Hartmut H. ORCID
Akhani, Hossein ORCID
Mahdavi, Parastoo
Luebert, Federico ORCID
Weigend, Maximilian ORCID
Thulin, Mats ORCID
Doyle, Jeff J.
Doyle, Jane L.
Vogan, Patrick
Forrest, Alan ORCID
Fulcher, Timothy K.
Devey, Dion S.
Chase, Mark W.
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Botanical Journal of the Linnean Society
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Abstract
We present a phylogenetic analysis using plastid (matK, rbcL) and nuclear (nrITS) DNA for diverse Euploca spp. (formerly Heliotropium section Orthostachys) from the worldwide distribution of a genus and including species encompassing the wide physiological and morphological diversity of the genus. Our results indicate that some remarkably complex features arose multiple times in parallel in Euploca, including attributes of its subsections under section Orthostachys, notably plants that, above ground, consist almost entirely of inflorescences. To elucidate in greater detail the distribution of C4 species in Euploca and Heliotropium s.s., we made > 800 δ 13C determinations, including some from the traditional genus Tournefortia. We greatly increase the number of proven C4 species in Euploca, but found none outside Euploca. Of the tested Euploca spp., c. 28% are C3 or intermediate in carbon fixation pathway. Our phylogenetic results indicate four parallel/convergent acquisitions of C4 photosynthesis or fewer origins with subsequent loss in some species.
DOI
https://doi.org/10.1093/botlinnean/boab082
Link
https://hdl.handle.net/20.500.12594/13110
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©Research Scotland Consortium
c/o RGBE 20a Inverleith Row
EH3 5LR
Edinburgh, Scotland, UK

Tel: 0131 248 2850
Email: info@ResearchScotland.ac.uk
Items in Research Scotland are protected by copyright with all rights reserved unless otherwise indicated.
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