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Abstract Detail


Gerelle, Wesley [1], Lam, Vivienne K.Y. [1], Wulff, Adrien [2], Leebens-Mack, James H. [3], dePamphilis, Claude D. [4], Wong, Gane Ka-Shu [5], Graham, Sean W. [1].

Genome evolution in Parasitaxus usta, a podocarp conifer with a unique form of heterotrophy.

Parasitaxus usta (Podocarpaceae) is a parasitic and possibly mycoheterotrophic conifer endemic to New Caledonia. Mycoheterotrophs derive some or all of their carbon requirements from another plant via fungal associates (here in host conifer tissue). Its plastid genome is quite highly reduced and lacks most photosynthesis genes, apart from several genes involved in the CF1 complex of ATP synthase. Most retained plastid-encoded genes (including ribosomal-protein genes, plastid-encoded RNA polymerase genes, matK, clpP, accD) appear to be evolving under purifying selection. We use a transcriptome produced as part of the 1KP (One Thousand Plants) project to explore genome-wide patterns of gene retention, including nuclear-encoded subunits of plastid protein complexes such as ATP synthase. We also examine how these genes are evolving based on analysis of dN/dS ratios, and document patterns of Gene Ontology (GO) term enrichment or depletion relative to photosynthetic relatives.

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1 - University Of British Columbia, Botany, 3529 - 6270 University Boulevard, Vancouver, BC, V6T 1Z4, Canada
2 - Université de la Nouvelle-Calédonie, Laboratoire Insulaire du Vivant et de l'Environnement, Nouméa, 98851, New Caledonia
3 - University Of Georgia, Plant Biology, 2502 Miller Plant Sciences, Athens, GA, 30602, USA
4 - Pennsylvania State University, Department Of Biology, 101 Life Sciences Building, University Park, PA, 16802, USA
5 - University of Alberta, Biological Sciences; Medicine (Gastroenterology), CW405 Biological Sciences, Edmonton, AB, T6G 2E9, Canada

Gene ontology

Presentation Type: Oral Paper:Papers for Topics
Session: 73
Location: Salon 9/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 4:00 PM
Number: 73009
Abstract ID:1151
Candidate for Awards:None


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