Related Experiment Video
Updated: May 28, 2026
11:48
A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
Published on: October 28, 2021
Multilocus phylogenetics show high intraspecific variability within Fusarium avenaceum
Tomasz Kulik1, Agnieszka Pszczółkowska, Maciej Lojko
1Department of Diagnostics and Plant Pathophysiology, University of Warmia and Mazury, Plac Łódzki 5, 10-957, Olsztyn, Poland; E-Mails: agnieszka.pszczolkowska@uwm.edu.pl (A.P.); macieklojko@wp.pl (M. Ł.).
International Journal of Molecular Sciences
|October 22, 2011
Summary
Fusarium avenaceum exhibits high genetic variation and frequent recombination, lacking distinct host or geographic lineages. This suggests widespread genotype distribution and no host specialization in this common plant pathogen.
Area of Science:
- Plant pathology
- Mycology
- Population genetics
Background:
- Fusarium avenaceum is a widespread soil saprophyte and pathogen affecting cereal crops globally.
- It is a significant contributor to crown rot and head blight, impacting grain yield and quality.
- This species is notable for contaminating grain with enniatins, often at high prevalence.
Purpose of the Study:
- To investigate the intraspecific genetic variability within Fusarium avenaceum.
- To determine if host (wheat) or geographic origin influences the genetic structure of F. avenaceum populations.
- To understand the evolutionary dynamics, including recombination and specialization, of F. avenaceum.
Main Methods:
- Phylogenetic analyses using multilocus sequence (MLS) data from 63 F. avenaceum isolates.
- Utilized partial sequences of elongation factor-1 alpha, enniatin synthase, rDNA intergenic spacer, arylamine N-acetyltransferase, and RNA polymerase II.
- Maximum parsimony analyses were performed on both MLS and individual data sets.
Main Results:
- High levels of genetic variation were observed within the studied F. avenaceum isolates.
- No significant linkage disequilibrium was detected.
- Phylogenetic analyses revealed a lack of clear structure related to host (wheat) or geographic origin, indicating widespread genotype distribution.
Conclusions:
- Fusarium avenaceum lacks host specialization and clear geographic lineage structure.
- Frequent recombination appears to be a significant factor in the population genetics of this species.
- The observed genetic patterns suggest that geographic isolation and host-specific pressures have minimal impact on F. avenaceum evolution.
Related Concept Videos
02:54Evolutionary Relationships through Genome Comparisons
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...
01:28Fungal Phylum Microsporidia
Microsporidia are a group of obligate intracellular fungi that were initially classified as protists but were later reclassified based on phylogenetic, molecular, and structural evidence linking them to the Chytridiomycota. These unicellular, non-motile organisms are highly specialized parasites that infect a wide range of animal hosts, including humans. They have evolved extensive genomic and metabolic reductions, making them highly dependent on their hosts for survival.Morphology and Genomic...
01:28Fungal Phylum Ascomycota
Phylum Ascomycota, a major division within the subkingdom Dikarya, comprises a diverse range of fungal species, including both unicellular yeasts and filamentous molds such as Aspergillus and Penicillium. These fungi thrive in a variety of habitats, from aquatic ecosystems to terrestrial environments, playing crucial ecological and economic roles.Morphology and ReproductionThe defining characteristic of Ascomycetes, commonly referred to as sac fungi, is the ascus—a sac-like structure that...
01:29Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
01:26Fungal Phylum Basidiomycota
Basidiomycota is a diverse phylum of fungi that includes ecologically significant decomposers such as white rot fungi, symbionts like mycorrhizal fungi, plant pathogens such as rusts and smuts, and edible species like Agaricus bisporus (the common button mushroom). These fungi play crucial roles in nutrient cycling, symbiotic relationships, and even human health. Their defining feature is the basidium, a microscopic club-shaped structure responsible for producing basidiospores.Fruiting Bodies...
01:27Diversity of Protists IV
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...