病原体に対する耐性の媒介は,根から抗菌剤のエクスズデーションによるものです
Harsh P Bais1, Balakrishnan Prithiviraj, Ajay K Jha
1Department of Horticulture and Landscape Architecture, and Center for Rhizosphere Biology, Colorado State University, Fort Collins, Colorado 80523-1173, USA.
Nature
|March 11, 2005
まとめ
アラビドプシス・タリアナ (Arabidopsis thaliana) の根は,抗菌化合物を放出することで,細菌の病原体に抵抗します. 特定の Pseudomonas syringae 菌株は,メタボライトの放出を阻害し,病気を引き起こすことで,この植物防御を克服します.
科学分野:
- 植物病理学 植物病理学
- 微生物生態学とは
- バイオケミストリー バイオケミストリー
背景:
- ほとんどの植物と微生物の相互作用は,病気を引き起こさないので,強い自然抵抗性を示す.
- 植物疾患に対する耐性は,複雑で,多要素の特性であることが知られている.
研究 の 目的:
- 植物の病気に対する耐性における根排液の役割を調査する.
- 細菌の病原体が植物の防御を克服できるメカニズムを特定する.
主な方法:
- アラビドプシス・タリアナをモデル植物システムとして利用した.
- 様々な細菌の病原体に対する根排液の抗菌特性について調査した.
- 植物防衛化合物を干渉する能力を含む,Pseudomonas syringaeの毒性のメカニズムを調べた.
主要な成果:
- アラビドプシス・タリアナの根は,様々な細菌病原体に耐性を与える抗菌代謝物質を放出します.
- これらの排泄物に対して耐性があり,その合成/排泄を阻害できる特定のPseudomonas syringae菌株が,アラビドプシスの根を感染させることに成功した.
- このPseudomonas syringae菌株の抗菌エクスズデーションを阻害する能力は,そのタイプIIIの分泌系に依存していることが判明しました.
結論:
- 根系由来の抗微生物代謝物質の排泄は,Arabidopsis thaliana.の組織特異的な疾患耐性のための重要なメカニズムです.
- 病原菌の毒性は,植物防衛化合物の活性抑制を含むことができるが,Pseudomonas syringaeがタイプIIIの分泌系を使用していることが例である.
- これらの植物-病原体相互作用を理解することは,効果的な病気管理戦略の開発に不可欠です.
関連する概念動画
Responses to Drought and Flooding
10.2K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.2K
Defenses Against Pathogens and Herbivores
21.6K
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.
21.6K
Defense Against Bacterial Pathogens
3.0K
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...
3.0K
Development of Antibiotic Resistance
2.0K
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
2.0K
Microbial Interactions: Cooperation
59
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...
59
Microbe-Plant Interactions
140
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...
140


