Related Experiment Video
Updated: May 29, 2026
15:14
Establishing Fungal Entomopathogens as Endophytes: Towards Endophytic Biological Control
Published on: April 11, 2013
Systemically induced resistance and microbial competitive exclusion: implications on biological control.
A Martinuz1, A Schouten, R A Sikora
1Institute of Crop Science and Resource Conservation (INRES), Department of Plant Health, Soil Ecosystem Phytopathology and Nematology Laboratory, University of Bonn, Nussallee 9, 53115 Bonn, Germany. martinuz@catie.ac.cr
Phytopathology
|September 9, 2011
Summary
Fusarium oxysporum (Fo162) and Rhizobium etli (G12) protect tomato plants from root-knot nematodes. However, these beneficial microbes are incompatible when applied together, as G12 reduces Fo162 colonization.
Area of Science:
- Agricultural Science
- Plant Pathology
- Microbiology
Background:
- Root-knot nematodes (Meloidogyne incognita) cause significant damage to tomato crops.
- Mutualistic endophytes Fusarium oxysporum strain Fo162 (Fo162) and Rhizobium etli strain G12 (G12) can induce systemic resistance against M. incognita.
Purpose of the Study:
- To investigate the compatibility of Fo162 and G12 as biocontrol agents against M. incognita in tomato.
- To determine if simultaneous inoculation of spatially separated endophytes affects their efficacy and colonization.
Main Methods:
- Utilized triple-split-root tomato plants for spatially separated inoculation of Fo162 and G12.
- Compared M. incognita infection levels and root colonization by Fo162 under different inoculation scenarios.
Main Results:
- Spatially separated inoculation of Fo162 and G12 did not result in additive reductions in M. incognita infection.
- G12 inoculation on a separate root section significantly reduced Fo162 root colonization by 35-50% compared to controls.
- This suppression suggests G12 may induce plant defense mechanisms that inhibit Fo162.
Conclusions:
- While both Fo162 and G12 can individually suppress M. incognita, they are incompatible biocontrol agents when applied simultaneously to the same tomato plant.
- The suppressive effect of G12 on Fo162 colonization highlights potential interference in their combined application.
Related Concept Videos
01:28Biological Methods for Microbial Control
Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
01:26Microbial Interactions: Competition
Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
01:22Microbial Interactions: Parasitism
Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...
01:21Microbiota Modulation by Antibiotics
Antibiotics have revolutionized modern medicine by saving countless lives from bacterial infections. However, their widespread use has inadvertently harmed the delicate balance of the human gut microbiota. The gut microbiota, a complex community of bacteria, archaea, viruses, and fungi, plays a vital role in regulating metabolism, immune responses, and maintaining intestinal health. Antibiotics, especially broad-spectrum types, disrupt this ecosystem by eradicating both harmful and beneficial...
01:26Microbial Interactions: Cooperation
Microbial cooperation involves beneficial interactions in which different species work together for individual or mutual advantage. These interactions can profoundly influence ecological dynamics and evolutionary processes, and they are essential to many pathogenic and symbiotic relationships.Nematode–Bacteria CooperationA striking example is the relationship between the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes...
01:31Defense Against Bacterial Pathogens
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...