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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
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Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...
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The genomes of eukaryotes are punctuated by long stretches of sequence which do not code for proteins or RNAs. Although some of these regions do contain crucial regulatory sequences, the vast majority of this DNA serves no known function. Typically, these regions of the genome are the ones in which the fastest change, in evolutionary terms, is observed, because there is typically little to no selection pressure acting on these regions to preserve their sequences.
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Related Experiment Video

Updated: May 5, 2026

A PCR-based Genotyping Method to Distinguish Between Wild-type and Ornamental Varieties of Imperata cylindrica
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Chloroplast DNA variation in the grass tribe Festuceae.

H Lehväslaiho1, A Saura, J Lokki

  • 1Department of Genetics, University of Helsinki, Arkadiankatu 7, SF-00100, Helsinki 10, Finland.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|November 19, 2013
PubMed
Summary

Chloroplast DNA analysis revealed that Lolium multiflorum is closely related to Festuca pratensis and Festuca arundinacea. This finding clarifies grass evolutionary relationships, showing Lolium multiflorum is more affiliated with these Festuca species than F. rubra is.

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Area of Science:

  • Plant genetics
  • Molecular biology
  • Bioinformatics

Background:

  • Understanding the evolutionary relationships between grass species is crucial for agriculture and ecology.
  • Chloroplast DNA (cpDNA) analysis is a powerful tool for phylogenetic studies.
  • Previous classifications sometimes grouped related species inaccurately.

Purpose of the Study:

  • To investigate the phylogenetic relationships among six grass species: Hordeum sativum, Dactylis glomerata, Festuca arundinacea, F. pratensis, F. rubra, and Lolium multiflorum.
  • To evaluate the effectiveness of chloroplast DNA restriction fragment analysis for taxonomic purposes.
  • To clarify the specific affiliations within the Festuca and Lolium genera.

Main Methods:

  • Six grass species were analyzed using chloroplast DNA (cpDNA) restriction fragment length polymorphism (RFLP).
  • DNA fragments were generated using restriction endonucleases and labeled with sulfur-35 ((35)S) nucleotides.
  • The cpDNA analysis method was compared against other commonly used techniques.

Main Results:

  • The analysis demonstrated a close genetic affiliation between Lolium multiflorum and Festuca pratensis.
  • Lolium multiflorum also showed a strong relationship with Festuca arundinacea.
  • Festuca rubra was found to be less closely related to these species than Lolium multiflorum was.

Conclusions:

  • Lolium multiflorum shares a closer evolutionary history with Festuca pratensis and F. arundinacea than previously recognized.
  • cpDNA restriction fragment analysis provides a reliable method for resolving grass phylogenetic relationships.
  • The findings necessitate a potential revision of current grass taxonomy and classification systems.