ArticleJournal of molecular evolution2005
The chloroplast trnT-trnF region in the seed plant lineage Gnetales.
Article in Journal of molecular evolution, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Survey ofPhysiology and molecular biology of plants : an international journal of functional plant biology · 2024Article
- Article
- Molecular identification of Mango, Mangifera indica L.var. totupura.Bioinformation · 2011Article
- GISSD: Group I Intron Sequence and Structure Database.Nucleic acids research · 2008Article
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2 authors.
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Abstract
The trnT-trnF region is located in the large single-copy region of the chloroplast genome. It consists of the trnL intron, a group I intron, and the trnT-trnL and trnL-trnF intergenic spacers. We analyzed the evolution of the region in the three genera of the gymnosperm lineage Gnetales (Gnetum, Welwitschia, and Ephedra), with especially dense sampling in Gnetum for which we sequenced 41 accessions, representing most of the 25-35 species. The trnL intron has a conserved secondary structure and contains elements that are homologous across land plants, while the spacers are so variable in length and composition that homology cannot be found even among the three genera. Palindromic sequences that form hairpin structures were detected in the trnL-trnF spacer, but neither spacer contained promoter elements for the tRNA genes. The absence of promoters, presence of hairpin structures in the trnL-trnF spacer, and high sequence variation in both spacers together suggest that trnT and trnF are independently transcribed. Our model for the expression and processing of the genes tRNA(Thr)(UGU), tRNA(Leu)(UAA), and tRNA(Phe) (GAA) therefore attributes the seemingly neutral evolution of the two spacers to their escape from functional constraints.
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