Back to Search
Start Over
Plastid Genome Degradation in the Endangered, Mycoheterotrophic, North American Orchid Hexalectris warnockii
- Source :
- Genome Biology and Evolution
- Publication Year :
- 2018
- Publisher :
- Oxford University Press (OUP), 2018.
-
Abstract
- Heterotrophic plants provide evolutionarily independent, natural experiments in the genomic consequences of radically altered nutritional regimes. Here, we have sequenced and annotated the plastid genome of the endangered mycoheterotrophic orchid Hexalectris warnockii. This orchid bears a plastid genome that is ∼80% the total length of the leafy, photosynthetic Phalaenopsis, and contains just over half the number of putatively functional genes of the latter. The plastid genome of H. warnockii bears pseudogenes and has experienced losses of genes encoding proteins directly (e.g., psa/psb, rbcL) and indirectly involved in photosynthesis (atp genes), suggesting it has progressed beyond the initial stages of plastome degradation, based on previous models of plastid genome evolution. Several dispersed and tandem repeats were detected, that are potentially useful as conservation genetic markers. In addition, a 29-kb inversion and a significant contraction of the inverted repeat boundaries are observed in this plastome. The Hexalectris warnockii plastid genome adds to a growing body of data useful in refining evolutionary models in parasites, and provides a resource for conservation studies in these endangered orchids.
- Subjects :
- 0301 basic medicine
Genome evolution
Inverted repeat
Pseudogene
Genome, Plastid
pseudogene
Biology
Genes, Plant
heterotroph
Genome
Evolution, Molecular
03 medical and health sciences
chloroplast
Tandem repeat
evolution
Genetics
orchid
Plastid
Orchidaceae
Gene
Ecology, Evolution, Behavior and Systematics
Plant Proteins
Endangered Species
Heterotrophic Processes
plastome
Genome Report
030104 developmental biology
Chloroplast DNA
Evolutionary biology
North America
Pseudogenes
Subjects
Details
- ISSN :
- 17596653
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Genome Biology and Evolution
- Accession number :
- edsair.doi.dedup.....5a96edab127fa477bf51e911272d883f