Name: microbial cooperation in soil and hosts
Uploaded: 2026-03-12T13:57:41.000Z
Duration: 1 min 26 s
Channel: JoVE

협력은 모든 참여 생물이 상호 의존 없이 비상호작용보다 이익을 얻는 종 간 상호작용입니다.예를 들어, 어린 기생선충인 Steinernema carpocapsae는 장내에 Xenorhabdus 선충 균을 보유하고 있습니다.곤충 숙주를 감염시킨 후, 어린 선충은 박테리아를 곤충의 체내로 배출합니다.그곳에서 박테리아는 증식하여 24시간에서 48시간 이내에 숙주를 죽이는 독소와 시체를 다른 미생물과 개미로부터 보호하는 항균제를 방출합니다.박테리아 신호는 선충의 성숙을 촉진하여 성충이 시체 안에서 교미하고 알을 낳을 수 있게 합니다.푸사리움과 같은 곰팡이는 토양에서 균사 네트워크를 형성하여 슈도모나스 푸티다(Pseudomonas putida)와 같은 박테리아의 이동을 지원합니다.푸사리움 균사는 소량의 물과 점액을 분비하여 박테리아가 이동하는 '고속도로' 역할을 하는 얇고 안정적인 막을 형성합니다.이동성 박테리아는 균사에서 나오는 화학 신호를 감지하여 수로를 이용해 새로운 영역으로 이동합니다.그 대가로 박테리아는 영양분 이동을 촉진하여 곰팡이의 국소 영양분 가용성을 높입니다.

미생물 간 상호작용: 협력

Microbial Interactions: Cooperation

미생물 협력은 서로 다른 종들이 개인 또는 상호 이익을 위해 함께 협력하는 유익한 상호작용을 포함합니다. 이러한 상호작용은 생태학적 역학과 진화 과정에 깊은 영향을 미칠 수 있으며, 많은 병원성 및 공생 관계에 필수적입니다.<h3>선충-박테리아 협력</h3>눈에 띄는 예는 그람음성 박테리아인 Xenorhabdus nematophila 와 기생 선충인 Steinernema carpocapsae 간의 관계입니다. X. 네마토필라 를 옮기는 어린 선충은 토양에 서식하며 성숙하려면 곤충 숙주가 필요합니다. 감염 후 선충은 박테리아를 곤충 몸으로 배출하고, 박테리아는 증식하여 타입 III 분비 시스템을 통해 숙주를 죽이는 독소를 방출합니다. 그 결과, 박테리아는 미생물 분해와 개미 청소를 막기 위한 보호 화합물을 생성합니다. 이후에는 선충의 성숙을 촉진하는 신호를 방출합니다. 곤충 시체는 성충 선충과 알로 가득 찬 번식지가 됩니다. 새로운 어린 개체는 X. 선충 을 획득하여 새로운 숙주를 감염시키기 위해 흩어져 이 순환을 지속시킵니다.<h3>곰팡이-박테리아 수송망</h3>토양 생태계에서 곰팡이와 박테리아는 종종 확산과 정착에 협력합니다. 푸사리움 종과 같은 곰팡이는 광범위한 균사망을 형성하여 수분과 점액을 방출하여 균사 주변에 얇은 막을 만듭니다. 주변의 박테리아는 주로 화학주성을 통해 이러한 수로를 감지합니다. 물이 존재함을 감지하면 박테리아는 곰팡이 네트워크 근처에 모입니다. 이 수로는 흔히 '곰팡이 고속도로'라고 불리며, Pseudomonas putida 같은 운동성 박테리아가 제한적인 토양 환경을 탐색하는 데 도움을 줍니다.박테리아는 균사에서 방출되는 화학적 신호를 따라 수막을 이용해 새로운 영양분이 풍부한 부위에 도달합니다. 이러한 협력은 박테리아 확산을 촉진하며, 영양 접근을 개선하거나 미생물 보호를 제공함으로써 균류에게 이익이 될 수 있습니다. 예를 들어, Aspergillus 와 Bacillus spp.와 같은 시스템에서는 전사체 분석을 통해 균류의 하향 조절과 박테리아의 티아민 생합성 상향 조절과 같은 조정된 대사 조정이 나타나 영양소 공유를 시사합니다.이러한 예시들은 다양한 환경에서 미생물 협력의 복잡성과 생태학적 중요성을 보여줍니다.

Microbial cooperation involves beneficial interactions in which different species work together for individual or mutual advantage. These interactions can ...

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Education

교육

JoVE Core

Microbiology

미생물학

Unit

단위

Microbial Ecology

미생물 생태학

KEY TERMS AND CONCEPTS

주요 용어 및 개념

microbial cooperation in soil and hosts

Microbial cooperation describes helpful interactions between different species. In these partnerships, microbes work together for one or mutual benefit. These interactions can shape ecosystems and evolution. They also play major roles in symbiosis and disease.

One clear example involves the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes carry the bacteria in the soil and need an insect host to mature. When the nematode infects an insect, it releases the bacteria into the insect's body. The bacteria multiply and use a type III secretion system to release toxins that kill the host.

After the insect dies, the bacteria make protective compounds that help stop microbial breakdown and ant scavenging. They also send signals that trigger nematode maturation. The insect cadaver then becomes a place for adult nematodes and eggs. New juveniles pick up X. nematophila and spread to find new hosts, which continues the cycle.

Fungi and bacteria also cooperate during movement through soil. Fungi such as Fusarium species form long hyphal networks that release water and mucilage. This creates thin water films around the hyphae. Nearby bacteria detect these channels through chemotaxis, which is movement in response to chemicals, and gather around the fungal networks.

These water pathways are often called fungal highways. They help motile bacteria such as Pseudomonas putida move through soil that would otherwise be difficult to cross. The bacteria follow chemical cues from the hyphae and use the water films to reach new nutrient-rich areas. This cooperation can also help fungi by improving access to nutrients or by offering microbial protection.

In some systems, such as Aspergillus and Bacillus species, transcriptomic analysis shows coordinated metabolic changes. In these cases, the fungus downregulates activity, while the bacteria increase thiamine biosynthesis. These patterns suggest nutrient sharing. Together, these examples show how microbial cooperation supports dispersal, survival, and growth in different environments.

Microbial Cooperation in Soil and Hosts

introduction to microbial ecology

Microbial Communities in Soil and Extremes

Microbial ecology looks at how microorganisms live, interact, and adapt in different ecosystems. It also shows how these tiny organisms help shape nutrient cycling, energy flow, and environmental balance. An ecosystem includes living parts and non-living parts, and microbes respond to both. Microorganisms can form populations, which are groups of the same species living together at the same time. When populations from different species live and interact in the same place, they form a microbial...

ecological niche

Microbial Niches in Ecosystems

Microbial niches describe how microorganisms survive, grow, and interact in an ecosystem. A niche includes how a microbe gets resources, reproduces, and relates to other species in its environment. This idea helps explain microbial community dynamics, biogeography, and ecosystem function. A microorganism’s fundamental niche is the full range of conditions where it could survive, grow, and reproduce. These conditions include both biotic factors, such as living interactions, and abiotic factors,...

methods to assess microbial populations

Measuring Microbes in Samples

Measuring microbes in a sample helps scientists study health, ecology, and industry. Microbial counts can show how many cells are present, how diverse they are, and what they may be doing. To do this, researchers use both culture-based and molecular methods. A viable plate count is a classic culture method for estimating living microbes. The sample is first diluted step by step, then spread on nutrient agar plates. Each viable cell can grow into a visible colony, so the colonies can be counted.

methods to assess microbial communities

Measuring Microbial Diversity and Activity

Microbial communities include bacteria, archaea, and eukaryotic microorganisms. They live in many ecosystems and affect important environmental and biological processes. Scientists study these communities by looking at how many species are present, how many individuals each species has, and how evenly the species are spread out. Species richness is the number of different species in a sample. Species abundance is the relative amount of each species. Species evenness describes how uniformly the...

the winogradsky column

Microbial Layers Inside a Winogradsky Column

A Winogradsky column shows how microbial layers form in a simple, sealed ecosystem. It is a clear model for studying microbial ecology and how different metabolisms interact in sediment over time. The setup uses a transparent glass cylinder. Half of it is filled with sediment mixed with cellulose, such as shredded paper, calcium carbonate, and gypsum. The cellulose provides a carbon source. Calcium carbonate buffers pH, and gypsum supplies sulfate. The rest of the cylinder is filled with pond...

microenvironments

Microbial Niches in Tiny Habitats

Microorganisms live in tiny habitats called microenvironments. These spaces have their own physical and chemical conditions. Oxygen level, pH, temperature, light, and nutrient supply can all differ from the surrounding area. These local conditions strongly affect microbial growth, metabolism, and which species can live there. Microenvironments often have sharp gradients over very small distances. In soil, oxygen may be available at the particle surface but drop off just a few millimeters below.

microbial mats

Microbial Mats and Oxygen Gradients

Microbial mats are layered communities of microbes that grow in response to changes in light, oxygen, and nutrients. These ecosystems are highly organized, and different microorganisms live at different depths. Biofilms are the early stage of this growth and are only a few millimeters thick. Mature microbial mats can grow to centimeter scale and show clear vertical structure. This layered arrangement lets microbes fill separate niches within a very small space. In cyanobacterial mats from hot...

microbial interactions: mutualism

Mutualistic Partnerships in Nature

Mutualistic partnerships in nature show how two or more organisms can benefit from living together. These symbiotic relationships can be obligate, meaning the partners depend on each other, or facultative, meaning the association is helpful but not required. Mutualism helps support many ecosystem functions across land and water. One common example is the partnership between plant roots and mycorrhizal fungi, such as Rhizophagus species. The fungal hyphae grow into the root hairs and epidermis,...

microbial interactions: cooperation

Microbial cooperation describes helpful interactions between different species. In these partnerships, microbes work together for one or mutual benefit. These interactions can shape ecosystems and evolution. They also play major roles in symbiosis and disease. One clear example involves the Gram-negative bacterium Xenorhabdus nematophila and the parasitic nematode Steinernema carpocapsae. Juvenile nematodes carry the bacteria in the soil and need an insect host to mature. When the nematode...

microbial interactions: predation

How Microbes Hunt and Defend

Microbial predation is a form of interaction in which one microorganism kills and eats another to gain nutrients and energy. It includes both bacterial predators and protozoan predators. This process helps shape microbial communities and affects how nutrients move through the environment. Some bacterial predators attack from the outside, while others enter the prey cell. Epibiotic predators, such as Vampirococcus, attach to the surface of a prey cell and release hydrolytic enzymes. These...

microbial interactions: competition

Microbial Competition and Niche Partitioning

Microbial competition shapes how bacteria and other microbes share space and resources. In shared environments, they compete for nutrients, space, or light. The strength of this competition depends on the environment, including nutrient levels, space limits, and how many microbial species are present. These interactions help determine the structure, function, and resilience of microbial communities. Microbial competition is usually grouped into exploitative competition and interference...

microbial interactions: parasitism

Microbial Parasites and Host Dependence

Microbial parasites depend on a host for nutrients and shelter, and this dependence often harms the host. In parasitism, only the parasite benefits. This is different from mutualism, where both organisms gain from the relationship. Microbial parasites are classified by where they live in or on the host. Ectoparasites stay on the host’s surface, such as the skin or outer tissues, and take in nutrients from outside. Endoparasites live inside the host’s body and invade tissues or organs.

microbe-plant interactions

How Plant Microbes Affect Growth

Plant microbes can help, harm, or simply live alongside their hosts. These microbe-plant interactions shape plant growth, health, and ecosystem function. The plant microbiome includes bacteria, fungi, archaea, protists, and viruses, and these organisms may live on the plant surface, inside plant tissues, or in symbiosis throughout the plant. Some of the most important beneficial partnerships involve mycorrhizal fungi. These fungi form close connections with roots and are grouped as arbuscular...

microbes and the carbon cycle

How Microbes Move Carbon Through Earth

Microbes move carbon through Earth’s major reservoirs and help drive the carbon cycle. Carbon shifts among the biosphere, lithosphere, atmosphere, and hydrosphere, where it supports life and helps regulate climate. It commonly cycles as carbon dioxide (CO2), the oxidized form of carbon, but methane (CH4) and organic compounds also matter. Photosynthetic microbes take in atmospheric CO2 and turn it into organic carbon. Cyanobacteria are especially important because they carry out oxygenic...

microbes and methanogenesis

How Microbes Produce Methane

Methane production in anaerobic ecosystems depends on methanogenic archaea and the microbes that work with them. This process happens where oxygen is absent, such as wetlands, sediments, and animal gastrointestinal tracts. In these anoxic habitats, aerobic respiration cannot run, so microbes use other pathways to break down organic matter. Anaerobic decomposition starts when cellulolytic bacteria, or cellulose-digesting bacteria, hydrolyze dead organic material into simple sugars. Other...

microbes and the nitrogen cycle

Microbial Steps in the Nitrogen Cycle

Microbes drive the nitrogen cycle by changing nitrogen into forms that plants and other organisms can use. This biogeochemical cycle keeps nitrogenous compounds balanced in ecosystems. It also supports plant growth and microbial growth. Nitrogen fixation begins the cycle by converting inert atmospheric nitrogen gas, N2, into ammonia, NH3. This step depends on nitrogenase enzymes. Free-living diazotrophs do this on their own. Aerobic bacteria such as Azotobacter spp. and anaerobic bacteria such...

microbes and the sulfur cycle

Sulfur Cycling Through Microbial Reactions

Sulfur cycling depends on microbial reactions that move sulfur through rocks, water, soil, and the air. In Earth systems, sulfur shifts among inorganic forms such as sulfate, elemental sulfur, and sulfide. These changes happen through both abiotic processes and biological activity in oxic and anoxic environments. Sulfate is the most oxidized form of sulfur. It is stored mainly in rocks, marine sediments, and ocean water, where it acts as a long-term reservoir in the global sulfur cycle. In...

microbes and other elemental cycles

Microbes Driving Iron and Manganese Cycles

Microbes drive iron and manganese cycling in aquatic environments by changing these metals between reduced and oxidized forms. These reactions are especially important along redox gradients, where oxygen levels shift across stratified water layers. The microbes use these metals for energy, growth, and structural needs. In oxygen-rich surface waters, iron is usually present as insoluble ferric iron, Fe(III). Some bacteria release siderophores, which are small organic molecules that bind ferric...

marine microbial ecology

Microbial Life in the Ocean

Marine microbial life is shaped by salinity, low nutrients, and changing oxygen levels. These physical and chemical limits influence which microbes can survive and how they function. They also affect how ocean microbes help drive nutrient and carbon cycling. Small cell size is common in these environments because it gives microbes a larger surface-to-volume ratio. That helps them take up nutrients more efficiently when nutrients are scarce. In estuaries, where salinity changes often,...

deep sea microbial ecology

Deep Sea Microbes and Extreme Conditions

Deep sea microbes live in one of Earth’s harshest environments. The deep ocean is far below the sunlit photic zone, which usually reaches the upper 100 to 200 meters of open water. Below that layer, the bathypelagic and abyssal zones stretch from about 1,000 to 6,000 meters, and hadal trenches go even deeper. This region is dark, cold, and highly pressurized. Temperatures are usually around 2 to 3°C, although hydrothermal vents can be slightly warmer. Pressure rises by about 1 atmosphere for...

freshwater microbial ecology

Microbes in Streams, Lakes, and Rivers

Freshwater microbes live in streams, rivers, lakes, ponds, and marshes, but their communities change with water movement, light, depth, and nutrients. These systems are often grouped into lotic waters, which flow, and lentic waters, which are still or slow-moving. The physical setting shapes where microbes grow and how they get energy. In lentic systems, phytoplankton are the main producers. They make autochthonous organic carbon, which means carbon made within the water body. In lotic...

soil microbial ecology

How Soil Microbes Cycle Nutrients

Soil microbes drive nutrient cycling, organic matter turnover, and ecosystem stability. A gram of soil can contain thousands of bacterial and archaeal taxa, but their shared job is what helps sustain land ecosystems. Their activity changes the way carbon, nitrogen, and other nutrients move through soil. Soil is a patchwork of minerals, organic matter, water, and air. Microbes live in tiny microhabitats shaped by pore size, moisture, oxygen, and nutrients. Sandy soils drain fast and tend to...

key terms and concepts

Explore how microbes cooperate in soil and inside hosts, from nematode-bacteria partnerships that kill insects to fungal highways that help bacteria move.

Microbial Cooperation in Soil and Hosts | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

Microbial Cooperation in Soil and Hosts

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