Phytopathogen effectors subverting host immunity: different foes, similar battleground
1College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
Cell Host & Microbe
|October 23, 2012
Summary
Plant pathogens like bacteria, fungi, and oomycetes target common plant immune pathways. Effectors from diverse pathogens converge on similar host processes, revealing a shared battleground for plant disease resistance.
Area of Science:
- Plant pathology
- Molecular biology
- Immunology
Background:
- Phytopathogenic bacteria, fungi, and oomycetes utilize distinct invasion strategies.
- Pathogens secrete effector proteins to facilitate host colonization and parasitic lifestyles.
Purpose of the Study:
- To compare host immune pathways targeted by effectors from diverse plant pathogen groups.
- To identify common strategies employed by pathogens to overcome plant defenses.
Main Methods:
- Comparative analysis of effector protein functions across different plant-pathogen systems.
- Review of literature on host immune responses and pathogen effector manipulation.
Main Results:
- Despite diverse pathogen types and invasion routes, effectors target conserved host immune pathways.
- Targeted pathways include pattern recognition receptor signaling, phytohormone regulation, secretory pathways, and programmed cell death.
- These conserved pathways represent a common 'battleground' for plant pathogens.
Conclusions:
- Plant immune systems are targeted by a wide array of pathogen effectors through convergent strategies.
- Understanding these common targets is crucial for developing broad-spectrum disease resistance in plants.
Related Concept Videos
02:26Defenses Against Pathogens and Herbivores
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
01:09Microbe-Plant Interactions
Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
01:25Colonisation of Pathogens
Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
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...
01:31Defense 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...
01:16Transduction
Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome are...