Name: how plant microbes affect growth
Uploaded: 2026-03-12T13:57:28.000Z
Duration: 1 min 9 s
Channel: JoVE

미생물-식물 상호작용은 양방향 화학 신호에 의존하며, 유익하거나 중립적이거나 해로울 수 있습니다.내생 미생물은 식물 조직 내에 서식하며 종종 숙주와 공생 관계를 형성합니다.예를 들어, 콩과 식물인 콩류는 뿌리에 결절을 형성하는 질소 고정 박테리아인 리조비아를 서식합니다.이들은 상호 이익이 되는 상호작용을 하는데, 고정을 통해 식물에 사용 가능한 질소를 공급하는 대가로 당분을 공급합니다.하지만 토마토 식물과 같은 콩과 식물은 뿌리근과 중립적인 상호작용을 보입니다. 서로의 생존이나 기능에 큰 영향을 주지 않으면서도 공존합니다.반면, 일부 미생물은 해롭습니다. Agrobacterium tumefaciens와 같은 세균성 병원체는 상처를 통해 침투하여 관관혹 종양을 일으킵니다.백곰팡이균과 같은 괴로영양은 독소나 효소를 이용해 식물 세포를 죽입니다.

미생물-식물 상호작용

Microbe-Plant Interactions

미생물-식물 상호작용은 복잡한 화학 신호에 의해 형성된 동적 연관 스펙트럼을 나타냅니다. 이러한 상호작용은 중립적일 수도 있고, 유익할 수도 있으며, 해로울 수도 있으며, 식물의 생리학, 성장, 생태계 기능에 깊은 영향을 미칩니다. 박테리아, 곰팡이, 고세균, 원생생물, 바이러스로 구성된 식물 미생물군은 표면 정착, 내부 정착, 또는 전신적 공생을 통해 이러한 효과를 매개하는 데 중요한 역할을 합니다.특히 균근균류와의 상호공연은 식물 건강의 기초입니다. 이 균류들은 아부슐라 균근 또는 외근근으로 분류되며, 식물 뿌리와 광범위한 네트워크를 형성하여 토양에서 유래한 영양분과 물을 식물에 고정된 탄수화물로 교환합니다. 이 공생은 특히 인과 미세영양소 같은 영양소 흡수를 촉진하고, 비생물적 스트레스로부터 보호합니다. 식물 표면에 서식하는 스핑고모나스(Sphingomonas)와 같은 착생 미생물은 자외선(UV) 흡수 색소를 생성하여 광보호 기능을 제공하며, 간접적으로 병원체 정착을 억제할 수 있습니다.내생 미생물은 식물 조직 내에 해를 끼치지 않고 숙주 회복력을 향상시키는 경우가 많습니다. Rhizobium 속과 같은 공생 질소 고정 박테리아는 콩과 식물에 뿌리 결절과 같은 특수 구조를 형성하여 대기 중 질소(N₂)를 암모니아(NH₃)로 전환하여 식물의 질소 동화를 촉진하고 토양 비옥도를 향상시킵니다.반면, 병원성 미생물은 식물 기능을 방해하고 상당한 농업 손실을 초래할 수 있습니다. 푸치니아 레콘디타 (밀잎녹병)와 같은 생영양 균류는 즉각적인 죽음을 일으키지 않고 살아있는 세포에서 영양분을 추출합니다. Sclerotinia sclerotiorum (흰곰팡이)을 포함한 괴사영양 곰팡이는 잔해를 먹기 전에 효소 분해와 독소 생성을 통해 숙주 세포를 죽입니다.Agrobacterium tumefaciens와 같은 박테리아 병원체는 수평 유전자 전달을 통해 식물 게놈 발현을 조작하여 종양 유사 혹을 유도합니다. 후기 역병의 원인인 Phytophthora infestans와 담배 모자이크 바이러스(TMV)와 같은 원생생물은 식물을 표적으로 하는 다양한 병원성 전략을 더욱 잘 보여줍니다.이러한 상호작용을 이해하는 것은 작물 생산성, 질병 저항성, 지속 가능한 농업 관행 향상에 대한 통찰을 제공합니다.

Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, ...

https://cloudfront.jove.com/files/ftp_upload/40737/40737_article_thumb_40737.jpg

Education

교육

JoVE Core

Microbiology

미생물학

Unit

단위

Microbial Ecology

미생물 생태학

KEY TERMS AND CONCEPTS

주요 용어 및 개념

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 mycorrhizae or ectomycorrhizae. In exchange for plant-made carbohydrates, they help plants take up water, phosphorus, and other micronutrients. They can also improve tolerance to abiotic stress.

Other helpful microbes live on the plant surface or inside plant tissue. Epiphytic microbes, such as Sphingomonas, live on plant surfaces and can produce pigments that absorb ultraviolet light. This can protect plants from UV damage and may also make it harder for pathogens to colonize. Endophytic microorganisms live inside plant tissues without causing harm, and they often increase host resilience.

Nitrogen-fixing bacteria also support plant nutrition. Rhizobium species form root nodules in legumes and convert atmospheric nitrogen (N2) into ammonia (NH3). This gives the plant a usable form of nitrogen and can improve soil fertility.

Not all plant microbes are helpful. Biotrophic fungi, such as Puccinia recondita, take nutrients from living cells without killing them right away. Necrotrophic fungi, including Sclerotinia sclerotiorum, kill host cells with enzymes and toxins before feeding on the dead tissue. Bacterial pathogens like Agrobacterium tumefaciens can change plant gene expression by horizontal gene transfer and cause tumor-like galls. Protists such as Phytophthora infestans and viruses like Tobacco mosaic virus also damage plants. Studying these interactions helps explain crop loss and supports better disease resistance and sustainable agriculture.

How Plant Microbes Affect Growth

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 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...

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

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

Learn how helpful and harmful microbes interact with plants, from mycorrhizal fungi and Rhizobium to rust fungi, blight, and plant viruses.

How Plant Microbes Affect Growth | 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

How Plant Microbes Affect Growth

Description

Transcript