Name: plant organs and their specialized roles
Uploaded: 2026-08-26T08:38:54.694Z
Duration: 2 min 40 s
Channel: JoVE

K12 Standards

Arizona Science Standards

High School

Life Science

HS+B.L1

HS+B.L1U1.7

basic-plant-anatomy-roots-stems-and-leaves

Basic Plant Anatomy: Roots, Stems, and Leaves

Las plantas son a menudo percibidas
como menos complejas que los animales,

pero al igual que ellos,
las plantas est&#xE1;n hechas de

&#xF3;rganos y sistemas de &#xF3;rganos que
tienen funciones especializadas.

La vasta mayor&#xED;a de las plantas
tienen dos sistemas de &#xF3;rganos:

los sistemas de ra&#xED;z y brote.

Por lo general las ra&#xED;ces
crecen debajo de la tierra.

Sirven de ancla para la planta
y toman agua y nutrientes

del ambiente.

Los dos tipos m&#xE1;s grandes
de sistemas de ra&#xED;ces

son el sistema de ra&#xED;z pivotante y
el de ra&#xED;z fibrosa.

En el sistema de ra&#xED;z pivotante,
una ra&#xED;z primaria emerge de la semilla

en la germinaci&#xF3;n
y crece profundo hacia el suelo

y sirve como ancla para la planta.

Luego ra&#xED;ces laterales m&#xE1;s peque&#xF1;as
se desprenden de la ra&#xED;z primaria.

Sin embargo, en el sistema de
ra&#xED;z fibrosa, la ra&#xED;z primaria

solo soporta
el desarrollo del v&#xE1;stago.

Luego, muchas ra&#xED;ces delgadas
se separan del tallo bajo tierra.

Estas as&#xED; llamadas
ra&#xED;ces adventicias

forman una red superficial
en el suelo

que sostiene a la planta madura.

Los &#xF3;rganos que comprenden
el sistema de brotes

se pueden clasificar en &#xF3;rganos
reproductivos o vegetativos.

Los &#xF3;rganos reproductivos incluyen
flores, frutos, y conos.

Hay una diversidad considerable
en el modo en que las plantas

se reproducen y en consecuencia
en los &#xF3;rganos reproductivos

que poseen.

Sin embargo, los &#xF3;rganos vegetativos
siempre incluyen

tallos y hojas.

El tallo de una planta
brinda estructura,

apoyo para las hojas,
brotes y flores.

El tallo tambi&#xE9;n orienta las hojas
para maximizar la fotos&#xED;ntesis.

Los tallos se componen
de n&#xF3;dulos, puntos

en los cuales las hojas
y las ramas se unen,

e intern&#xF3;dulos, las regiones
del tallo m&#xE1;s all&#xE1; de los n&#xF3;dulos.

Un tallo llamado peciolo
une cada hoja en el n&#xF3;dulo.

la parte terminal de la hoja
se llama filo o l&#xE1;mina.

Las hojas simples tienen
una l&#xE1;mina por cada peciolo,

mientras que las hojas compuestas
tienen m&#xFA;ltiples hojas unidas

a cada peciolo.

Algunas plantas como el pasto
no tienen peciolo.

En cambio, la l&#xE1;mina envuelve
parte del tallo.

Las hojas realizan la mayor&#xED;a
de la fotos&#xED;ntesis.

Las l&#xE1;minas son a menudo finas
y alargadas

para maximizar la superficie
que se expone a la luz del sol.

Atkinson, Jonathan A., Amanda Rasmussen, Richard Traini, Ute Voß, Craig Sturrock, Sacha J. Mooney, Darren M. Wells y Malcolm J. Bennett. "Ramificación en raíces: descubriendo la forma, la función y la regulación". Fisiología Vegetal 166, no. 2 (1 de octubre de 2014): 538–50. [<a href="https://doi.org/10.1104/pp.114.245423" target="_blank">Fuente</a>]

anatomía básica de las plantas: raíces, tallos y hojas

Los &#xF3;rganos primarios de las plantas vasculares son las ra&#xED;ces, los tallos y las hojas, pero estas estructuras pueden ser muy variables y adaptarse a las necesidades y el entorno espec&#xED;ficos de diferentes especies de plantas. Ra&#xED;ces Si bien las ra&#xED;ces se encuentran con mayor frecuencia bajo tierra, este no es el caso en todos los casos. Las ra&#xED;ces a&#xE9;reas son cualquier ra&#xED;z que emerge sobre el suelo. Las plantas ep&#xED;fitas, como las orqu&#xED;deas, pueden vivir toda su vida sin tocar el suelo. Otros tipos de ra&#xED;ces a&#xE9;reas, como las de la higuera estranguladora o el baniano, germinan en la superficie pero crecen hacia abajo y eventualmente penetran el suelo y parecen &#x22;estrangular&#x22; a su planta hu&#xE9;sped. Algunas plantas tienen ra&#xED;ces que est&#xE1;n adaptadas para brindar apoyo adicional. Las ra&#xED;ces de contrafuerte son una de esas modificaciones. Las ra&#xED;ces de refuerzo, que a menudo se encuentran en &#xE1;rboles que crecen en &#xE1;reas tropicales donde el suelo es pobre en nutrientes y hay mucha agua disponible cerca de la superficie debido a las lluvias, brindan soporte estructural a &#xE1;rboles grandes con ra&#xED;ces poco profundas. Las ra&#xED;ces de refuerzo o ra&#xED;ces de apoyo son otro tipo de ra&#xED;z modificada que sostiene plantas altas y de ra&#xED;ces poco profundas, como el ma&#xED;z. Crecen como ra&#xED;ces adventicias (aquellas que no se desarrollan a partir de la ra&#xED;z primaria) desde nodos cerca de la parte inferior del tallo y llegan al suelo en &#xE1;ngulo para proporcionar soporte estructural. Tallos Los tallos de las plantas tienen varias funciones. Estos incluyen proporcionar estructura y sostener las hojas, los capullos y las flores. Adem&#xE1;s, el tallo ayudar&#xE1; a orientar las hojas para maximizar la fotos&#xED;ntesis. Los tallos se componen de nudos, puntos en los que se unen las hojas y ramas, y entrenudos, las regiones del tallo entre los nudos. El pec&#xED;olo es un tallo que ancla cada hoja en el nudo. Hojas Las hojas realizan la mayor parte de la fotos&#xED;ntesis. Si bien las hojas pueden tener una amplia variedad de formas y tama&#xF1;os, las l&#xE1;minas suelen ser delgadas y aplanadas para maximizar la superficie expuesta a la luz solar. La parte terminal de la hoja se llama l&#xE1;mina. Las hojas simples tienen una l&#xE1;mina por pec&#xED;olo, aunque las hojas compuestas tienen m&#xFA;ltiples l&#xE1;minas adheridas a cada pec&#xED;olo. Algunas plantas, como las gram&#xED;neas, carecen de pec&#xED;olo. En cambio, la hoja envuelve directamente parte del tallo. Ra&#xED;ces, hojas y tallos como recipientes de almacenamiento Las ra&#xED;ces se pueden modificar para almacenar alimentos. Las ra&#xED;ces pivotantes, como las de las zanahorias y las remolachas, se agrandan para almacenar almidones. Los tallos y las hojas tambi&#xE9;n se pueden modificar para almacenar almidones; los tub&#xE9;rculos como las patatas son en realidad tallos modificados, aunque crezcan bajo tierra. Adem&#xE1;s, las cebollas son una hoja modificada que almacena almid&#xF3;n.

Anatomía básica de las plantas: raíces, tallos y hojas

The primary organs of vascular plants are roots, stems, and leaves, but these structures can be highly variable, adapted for the specific needs and ...

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Education

Educación

JoVE Core

Biology

Biología

Plant Biology

Biología Vegetal

Plant Structure, Growth and Function

Estructura, crecimiento y nutrición de las plantas

KEY TERMS AND CONCEPTS

TÉRMINOS Y CONCEPTOS CLAVE

plant organs and their specialized roles

Plants are built from roots, stems, and leaves, but each organ can change to fit a plant’s environment. These structures may look very different from one species to another. They still carry out the main jobs needed for growth and survival.

Roots are usually underground, but that is not always true. Aerial roots grow aboveground. Epiphytic plants, such as orchids, can live without ever touching soil. In strangler figs and banyans, aerial roots begin aboveground, grow downward, and later reach the soil. Some roots are also specialized for support. Buttress roots help large tropical trees stand upright in shallow soil. Brace roots, also called prop roots, support tall plants like corn. These roots are adventitious roots, which means they do not arise from the primary root. Instead, they grow from nodes near the lower stem and angle into the ground.

Stems provide structure and hold up leaves, buds, and flowers. They also help position leaves so they can capture more light for photosynthesis. A stem has nodes, where leaves and branches attach, and internodes, which are the stem regions between nodes. The petiole is the stalk that connects a leaf to the node.

Leaves carry out most photosynthesis. Many leaves are thin and flat, which increases the surface area exposed to sunlight. The blade, also called the lamina, is the wide part of the leaf. Simple leaves have one blade per petiole, while compound leaves have several blades attached to one petiole. Some plants, such as grasses, do not have petioles. In these plants, the blade attaches directly to part of the stem.

Roots, stems, and leaves can also store food. Taproots, such as carrots and beets, are enlarged to store starches. Stems and leaves can store starch too. Potatoes are tubers, which are modified stems even though they grow underground. Onions are modified leaves that store starch.

Plant Organs and Their Specialized Roles

introduction to plant diversity

Plant Adaptations for Life on Land

Plant adaptations for life on land explain how Kingdom Plantae moved from water to land about 410 million years ago. This shift happened when green algae began colonizing a new environment that had not been widely occupied. Land offered more light and carbon dioxide for growth, but it also created major challenges for early plants. One key adaptation was the cuticle, a waxy outer layer that helps prevent water loss. It traps moisture inside the plant. But it also limited direct gas exchange...

non-vascular seedless plants

Nonvascular Plants and Their Life Cycle

Nonvascular plants include some of the earliest plants on Earth. Today, this group includes liverworts, mosses, and hornworts. These plants are also called bryophytes. They have no true roots, leaves, or stems because they lack extensive vascular tissue. Bryophytes reproduce with spores instead of seeds. Their life cycle is dominated by the haploid gametophyte stage, which produces eggs and sperm. The sporophyte stage makes haploid spores that can grow by mitosis into new gametophytes. In many...

seedless vascular plants

Fern Life Cycles and Vascular Tissue

Seedless vascular plants include ferns, horsetails, whisk ferns, and lycophytes. Ferns are the most common example. Whisk ferns and their relatives, along with horsetails, are monilophytes. Lycophytes include club mosses, spikemosses, and quillworts, and none of these are true mosses. Seedless vascular plants differ from nonvascular plants because they have vascular tissue. This tissue includes xylem and phloem, which move water and nutrients through the plant. Most seedless vascular plants...

introduction to seed plants

Seed Plants: Cones, Flowers, and Fruits

Seed plants are land plants that make seeds, use pollen, and have reduced gametophytes. This group includes gymnosperms and angiosperms. Gymnosperms include cycads, Ginkgo biloba, gnetophytes, and conifers. Gymnosperms usually form cones. Pollen cones contain the male gametophytes. Ovulate cones contain the female gametophytes and produce exposed seeds after fertilization. Angiosperms are the most diverse and widespread land plants. They form flowers and fruit, and both structures support...

basic plant anatomy: roots, stems, and leaves

Plants are built from roots, stems, and leaves, but each organ can change to fit a plant’s environment. These structures may look very different from one species to another. They still carry out the main jobs needed for growth and survival. Roots are usually underground, but that is not always true. Aerial roots grow aboveground. Epiphytic plants, such as orchids, can live without ever touching soil. In strangler figs and banyans, aerial roots begin aboveground, grow downward, and later reach...

plant cells and tissues

Plant Growth and Support Tissues

Plant growth and support tissues help plants grow, protect themselves, and move materials through the body. Plant tissues are groups of similar cells that do related jobs. These tissues combine to form organs such as flowers, fruit, stems, and leaves. Two major kinds of plant tissue are meristematic tissue and permanent tissue. Meristematic tissue is the main growth tissue in plants. It can keep dividing and renewing itself, and every plant cell begins in a meristem. Meristematic tissue is...

meristems and plant growth

Plant Growth from Root and Shoot Tips

Plants grow throughout their lives, and that pattern is called indeterminate growth. This trait sets plants apart from most animals. Some plant parts stop growing, such as leaves and flowers, but roots and stems can keep growing for a long time. Meristems make this ongoing growth possible. A meristem is a plant tissue that contains undifferentiated cells called meristematic cells. When these cells divide, some daughter cells stay in the meristem. That keeps a supply of cells that can keep...

primary and secondary growth in roots and shoots

primary-and-secondary-growth-in-roots-and-shoots

Root and Shoot Growth: Length vs. Width

Root and shoot growth in vascular plants happens in two main ways: primary growth and secondary growth. Primary growth makes roots and shoots longer. Secondary growth makes them thicker. Many woody plants show both kinds of growth, and the two can happen at the same time. Primary growth happens in newer parts of the plant. Secondary growth happens in regions that have already finished primary growth. In roots and shoots, the process starts in apical meristems, which are areas of actively...

morphogenesis

Plant Flowering and Organ Identity

Plant flowering and organ identity shape a plant’s form and structure. These changes depend on growth and cell differentiation, which work together during plant morphogenesis. Precursor cells become specialized cell types, and those cells are organized into tissues and organ systems that support the whole plant. Plant growth and cell differentiation are controlled by hormones. Plant hormones regulate gene expression, often in response to environmental stimuli. Temperature and day length are...

light acquisition

How Plants Maximize Sunlight Capture

Plants need light energy to make glucose, so leaf shape and plant structure help determine how well they capture sunlight. Many modern plants have evolved leaves that are specialized for light capture. Leaf size can vary from just a few millimeters wide to tens of meters wide, depending on the environment. Competition for sunlight has pushed evolution toward larger leaves and taller plants. These changes help plants avoid being shaded by nearby competitors. They also depend on root systems...

water and mineral acquisition

How Roots Absorb Water and Minerals

Roots absorb water and minerals from the soil using specialized tissues. Their branching patterns help them reach more soil, and root hairs on the outer cells increase surface area for contact with the ground. Water enters roots passively because the water concentration in the soil is higher than in root tissue. Minerals move in a different way. They are taken up actively by root cells, which requires energy and transport proteins. Soil particles carry a negative charge, so positive ions...

short-distance transport of resources

Plant Cell Membranes and Water Balance

Plant cell membranes control how water, ions, and other solutes move over short distances. This transport can happen across just 2 to 3 cells, and it begins at the plasma membrane. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse through the membrane on their own. Ions and larger molecules need transport proteins because of their charge or size. Membrane transport also happens inside plant cells. The central vacuole stores resources and helps manage the cell’s...

xylem and transpiration-driven transport of resources

xylem-and-transpiration-driven-transport-of-resources

How Xylem Moves Water in Plants

Xylem moves water and dissolved minerals from the roots to the rest of the plant. The cells that carry xylem sap are dead when mature, so the flow is passive. Xylem transport depends on special tracheary elements, which connect directly with the extracellular space in the apoplast. There are two main tracheary elements: tracheids and vessel elements. Tracheids are long cells with lignified walls and small pits. These pits let xylem sap move from one cell to the next where the walls overlap.

regulation of transpiration by stomata

How Guard Cells Open Plant Stomata

How guard cells open and close plant stomata controls gas exchange in leaves. A stoma is a tiny opening in the leaf epidermis. The word comes from the Greek word for “mouth.” These openings let plants take in carbon dioxide for photosynthesis and release oxygen into the air. Each stoma is surrounded by two guard cells. When these cells take up water, they create an opening. Ion transport controls how much water stays in the guard cells. A trigger causes pumps to move hydrogen ions out of the...

adaptations that reduce water loss

Plant Features That Limit Water Loss

Plant features that limit water loss help plants survive in dry or hot environments. Water is needed for photosynthesis and other cell processes, so plants have evolved several ways to slow evaporation from their leaves. One major barrier is the cuticle, a waxy layer on the leaf epidermis. The epidermis is the outer cell layer, and it makes cutin and other plant waxes that form this hydrophobic coating. The cuticle helps stop water from escaping and also keeps out unwanted solutes. Its...

phloem and sugar transport

How Phloem Moves Sugars in Plants

Phloem moves sugars and other materials through plants. In angiosperms, sugar production is mostly limited to photosynthetic cells in the leaves. These leaves act as sugar sources because they make more sugar than they use. Roots, shoots, flowers, and fruits are usually sugar sinks because they need more sugar than they can make. This movement is called translocation. It carries sugar, hormones, amino acids, and some signaling molecules from source tissues to sink tissues. The transport...

the soil ecosystem

Soil Layers and How Soil Forms

Soil supplies plants with water and inorganic minerals. It is the natural medium for land plants, and its quality depends on both chemical makeup and living organisms in the soil. Healthy soil contains enough air, water, minerals, and organic matter to support plant growth. Soil is made of three major components. Inorganic mineral matter makes up about 40 to 45 percent of soil volume. Organic matter, also called humus, makes up about 5 percent. Water and air fill about 50 percent of the volume.

key elements for plant nutrition

Plant Nutrients: Macro and Micro Needs

Plants need both organic and inorganic nutrients to survive, grow, reproduce, and keep normal cell function. Researchers use hydroponics to study these essential nutrients. In hydroponic culture, plants grow without soil in water-based nutrient solutions. At least 17 nutrients are known to be essential for plants. Plants get these elements from the atmosphere, the soil around their roots, and water. Nine of them are macronutrients, which plants need in larger amounts. These macronutrients are...

the roles of bacteria and fungi in plant nutrition

the-roles-of-bacteria-and-fungi-in-plant-nutrition

How Soil Microbes Help Plants Get Nutrients

Soil microbes help plants get nutrients, water, and protection. Plants can make their own food by photosynthesis, but they still depend on organisms in the soil to get the nutrients they need to work properly. Bacteria and fungi form symbiotic relationships with plants, which helps both partners survive in many environments. The bacteria living in and around plant roots are called the rhizosphere. This community is very diverse. Some bacteria can cause disease, but most help plant health. In...

epiphytes, parasites, and carnivores

Plant Nutritional Adaptations in Nature

Plant nutritional adaptations help some species survive by using fungi, bacteria, or other plants and animals. Many plants also rely on mutualistic partners in the soil. Root-colonizing fungi, such as mycorrhizae, increase root surface area and improve nutrient absorption. Nitrogen-fixing bacteria, such as rhizobia, convert atmospheric nitrogen (N2) into ammonia (NH3), which plants can use to build essential molecules like chlorophyll. These relationships benefit both sides. The plant gets...

the apoplast and symplast

Plant Water Transport Pathways

Plant water transport pathways help roots absorb water and dissolved minerals from the soil. These pathways move materials through plant tissues that support growth and nutrient uptake. The main tissue regions involved are the apoplast and the symplast. The apoplast includes everything outside the plasma membrane of living cells. It contains cell walls, extracellular spaces, xylem, phloem, and tracheids. The symplast is the cytosol of all living plant cells, along with the plasmodesmata that...

key terms and concepts

Explore how roots, stems, and leaves are adapted for support, photosynthesis, and storage, with examples like corn, potatoes, carrots, and onions.

Plant Organs and Their Specialized Roles | JoVE K12

JoVE Core series brings biology to life through over 300 concise and easy-to-understand animated video lessons that explain key concepts in biology, plus more than 150 scientist-in-action videos that show actual research experiments conducted in today’s laboratories.

biology

JoVE Core Biología da vida a la biología a través de una serie con más de 300 lecciones de vídeo animadas, concisas y fáciles de entender, que explican conceptos clave de la biología, incluyendo también más de 150 vídeos de científicos en acción, que muestran experimentos reales realizados en laboratorios actuales de investigación.

Florida Department of Education

SC.912.L.14

SC.912.L.14.7

SC.912.L.14.10

new-york-state-science-learning-standards

New York State Science Learning Standards

Structure and Function

HS-LS1-2.

Georgia Standards of Excellence

9-12

Botany

SBO1.

basic-plant-structures-major-organs-tissues-cells-relation-to-their

Basic plant structures (major organs, tissues, and cells) in relation to their functions.

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Plant Organs and Their Specialized Roles

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