Name: fern life cycles and vascular tissue
Uploaded: 2026-08-26T08:20:02.772Z
Duration: 3 min 24 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.7

Seedless Vascular Plants

Il existe trois grands groupes de plantessur Terre - les plantes non vasculaires,plantes vasculaires sans graines et plantes &#xE0; graines. 
Les plantes vasculaires sans p&#xE9;pins ont &#xE9;t&#xE9; les premi&#xE8;resd&#x27;&#xE9;voluer vers des syst&#xE8;mes vasculaires sp&#xE9;cialis&#xE9;s- une adaptation qui les a aid&#xE9;s &#xE0; devenirles premi&#xE8;res grandes plantes sur Terre. 
Aujourd&#x27;hui, les plantes vasculaires sans p&#xE9;pins sont repr&#xE9;sent&#xE9;espar les lycophytes et les monilophytes. 
Les lycophytes comprennent les sphaignes, les mousses et les couettes. 
Notamment, aucun des glycophytes n&#x27;est une vraie mousse,qui sont des plantes non vasculaires. 
Les monilophytes comprennent les foug&#xE8;res, les queues de cheval et les foug&#xE8;reset leurs proches. 
Comme toutes les plantes, les plantes vasculaires sans p&#xE9;pinsafficher une alternance de g&#xE9;n&#xE9;rations dans leur viecomme le montre l&#x27;exemple suivant : une plante de foug&#xE8;re. 
Cela signifie qu&#x27;ils passent une partie de leur viecycle comme un haplo&#xEF;de gametophyte, et l&#x27;autre partiecomme un sporophyte diplo&#xEF;de. 
Comme les plantes non vasculaires, les plantes vasculaires sans p&#xE9;pinsse reproduisent &#xE0; l&#x27;aide de spores, plut&#xF4;t que de graines. 
Les spores sont haplo&#xEF;des, et sont dispers&#xE9;es par des structuresappel&#xE9; sori, group&#xE9; sur le dessous des feuilles. 
Les sori eux-m&#xEA;mes contiennent de nombreux sporanges. 
&#xC0; maturit&#xE9;, ces sporangesouvert, dispersant les spores haplo&#xEF;des. 
Les spores se d&#xE9;veloppent ensuite via mitose pour formerle gam&#xE9;tophyte haplo&#xEF;de. 
Au stade du gam&#xE9;tophyte - qui est g&#xE9;n&#xE9;ralement tr&#xE8;s petitet trouv&#xE9; sur ou juste en dessous de la surface du sol -Les gam&#xE8;tes haplo&#xEF;des sont form&#xE9;s par mitose. 
Un seul gam&#xE9;tophyte est bisexuel et d&#xE9;veloppedeux structures diff&#xE9;rentes - la noridie et l&#x27;arch&#xE9;ologie -qui produisent des gam&#xE8;tes respectivement sous forme masculine et f&#xE9;minine. 
Comme les plantes non vasculaires, le gam&#xE8;te m&#xE2;le du spermeest flagell&#xE9;e et n&#xE9;cessite de l&#x27;eaupour se rendre &#xE0; la gam&#xE8;te femelle - suivant un attractif chimiquepour trouver l&#x27;&#x153;uf. 
Parce que les gam&#xE8;tes dans un seul gam&#xE9;tophyteseront g&#xE9;n&#xE9;tiquement identiques en raison de leur origine haplo&#xEF;de,Les croisements se produisent g&#xE9;n&#xE9;ralement entre diff&#xE9;rents gam&#xE9;tophytes. 
Les foug&#xE8;res peuvent emp&#xEA;cher toute auto-f&#xE9;condationen faisant m&#xFB;rir leurs anth&#xE9;ridies et leurs arch&#xE9;ogonies&#xE0; des moments diff&#xE9;rents. 
Enfin, l&#x27;&#x153;uf f&#xE9;cond&#xE9; fera cro&#xEE;tre un nouveau sporophyte diplo&#xEF;dedu zygote diplo&#xEF;de du gam&#xE9;tophyte,l&#x27;ach&#xE8;vement du cycle de vie. 
Comme les plantes &#xE0; graines, les plantes vasculaires sans grainesont un cycle de vie domin&#xE9; par les sporophytes. 
Cependant, contrairement aux autres grandes lign&#xE9;es de plantes,leurs gam&#xE9;tophytes plus petits peuvent vivre de mani&#xE8;re ind&#xE9;pendante -ce qui signifie qu&#x27;ils ne fournissent pas de nourriture au sporophyte,ou l&#x27;exiger du sporophyte. 
La caract&#xE9;ristique principale des plantes vasculaires sans p&#xE9;pins est sans douteest leur r&#xE9;seau sp&#xE9;cialis&#xE9; de tissus vasculaires, &#xE0; l&#x27;instar de celui de lades plantes &#xE0; graines. 
Cette adaptation leur a permis de transporter de l&#x27;eau, des nutriments,et d&#x27;autres mati&#xE8;res organiques, et pour atteindre des tailles plus importantes -ce qui les distinguait de leurs parents non vasculaires.

Jones, Victor A.S. et Liam Dolan. 2012. « L’évolution des poils racinaires et des rhizoïdes ». Annales de botanique 110 (2) : 205-12. [<a href="https://doi.org/10.1093/aob/mcs136 » target="_blank">Source</a>]

Pittermann, Jarmila, Craig Brodersen et James E. Watkins. 2013. « La résilience physiologique des sporophytes et des gamétophytes des fougères : les progrès dans les relations avec l’eau offrent de nouvelles perspectives sur une ancienne lignée. » Frontières en science végétale 4. [<a href="https://doi.org/10.3389/fpls.2013.00285 » target="_blank">Source</a>]

Sigel, Erin M., Eric Schuettpelz, Kathleen M. Pryer et Joshua P. Der. 2018. « Chevauchement des modèles d’expression génique entre les phases gamétophyte et sporophyte dans la fougère Polypodium amorphum (Polypodiales). » Frontières en science végétale 9 (septembre). [<a href="https://doi.org/10.3389/fpls.2018.01450 » target="_blank">Source</a>]

plantes sans graine vascularisées

Les plantes vasculaires sans graines &#xE9;taient les premi&#xE8;res plantes hautes sur Terre 
 
 Aujourd&#x2019;hui, les plantes vasculaires sans graines sont repr&#xE9;sent&#xE9;es par les monilophytes et les lycophytes. Les foug&#xE8;res, les plantes vasculaires sans graines les plus courantes, sont des monilophytes. Les psilotes (et leurs parents) et les pr&#xEA;les sont &#xE9;galement des monilophytes. Les lycophytes comprennent les lycopodes, les s&#xE9;laginelles et les iso&#xE8;tes &#x2014; dont aucun n&#x2019;est une vraie mousse.
 
 Contrairement aux plantes non vasculaires, les plantes vasculaires, y compris les plantes vasculaires sans graines, ont un vaste r&#xE9;seau de tissus vasculaires compos&#xE9;s de xyl&#xE8;me et de phlo&#xE8;me. La plupart des plantes vasculaires sans graines ont &#xE9;galement de vraies racines et des feuilles. En outre, les cycles de vie des plantes vasculaires sans graines sont domin&#xE9;s par les sporophytes diplo&#xEF;des producteurs de spores, plut&#xF4;t que par les gam&#xE9;tophytes.
 
 Cependant, comme les plantes non vasculaires, les plantes vasculaires sans graines se reproduisent avec des spores plut&#xF4;t que des graines. Les plantes vasculaires sans graines sont &#xE9;galement g&#xE9;n&#xE9;ralement plus reproductrices dans des environnements humides parce que leurs spermatozo&#xEF;des ont besoin d&#x2019;un film d&#x2019;eau pour atteindre les ovules.
 
 Le cycle de vie des plantes vasculaires sans graines
 
 Comme les animaux, les plantes vasculaires sans graines (et d&#x2019;autres plantes) alternent entre la m&#xE9;iose et la f&#xE9;condation pendant la reproduction. La m&#xE9;iose est un processus de division cellulaire qui produit des cellules haplo&#xEF;des &#x2014; qui contiennent un ensemble complet de chromosomes &#x2014; &#xE0; partir d&#x2019;une cellule diplo&#xEF;de &#x2014; qui contient deux ensembles complets de chromosomes. La f&#xE9;condation, en revanche, produit une cellule diplo&#xEF;de appel&#xE9;e zygote par la fusion de cellules haplo&#xEF;des appel&#xE9;es gam&#xE8;tes : les spermatozo&#xEF;des et les ovules.
 
 Chez la plupart des animaux, seul le stade diplo&#xEF;de est multicellulaire, et les gam&#xE8;tes sont les seules cellules haplo&#xEF;des. Les plantes, cependant, alternent entre les stades haplo&#xEF;des et diplo&#xEF;des qui sont tous deux multicellulaires ; c&#x2019;est ce qu&#x2019;on appelle l&#x2019;alternance des g&#xE9;n&#xE9;rations. L&#x2019;alternance des g&#xE9;n&#xE9;rations est une caract&#xE9;ristique de toutes les plantes qui se reproduisent sexuellement, mais la taille relative et la pro&#xE9;minence des stades haplo&#xEF;de et diplo&#xEF;de diff&#xE8;rent d&#x2019;une plante &#xE0; l&#x2019;autre.
 
 Chez les plantes vasculaires sans graines (ainsi que les plantes avec graines), le stade diplo&#xEF;de du cycle de vie &#x2014; le sporophyte &#x2014; est dominant. Par exemple, ce que la plupart des gens reconnaissent comme une foug&#xE8;re est le grand sporophyte de foug&#xE8;re ind&#xE9;pendante. Les sporophytes produisent des cellules haplo&#xEF;des appel&#xE9;es spores par la m&#xE9;iose.
 
 Une spore peut germer et se d&#xE9;velopper en gam&#xE9;tophyte &#x2014; le stade haplo&#xEF;de du cycle de vie &#x2014; par la mitose. Les gam&#xE9;tophytes produisent des ovules et des spermatozo&#xEF;des par mitose (contrairement aux animaux, qui produisent des gam&#xE8;tes par m&#xE9;iose). La plupart des plantes vasculaires sans graines produisent un type de spore qui donne naissance &#xE0; un gam&#xE9;tophyte bisexuel. Les gam&#xE9;tophytes sont plus petits et moins complexes structurellement que les sporophytes, mais ils peuvent faire la photosynth&#xE8;se et ne d&#xE9;pendent pas du sporophyte pour se nourrir ou se prot&#xE9;ger.
 
 Les ovules et les spermatozo&#xEF;des fusionnent par f&#xE9;condation, formant un zygote diplo&#xEF;de. Le zygote se divise par mitose pour g&#xE9;n&#xE9;rer le sporophyte de foug&#xE8;re &#xE0; frondes familier, poursuivant le cycle.

Plantes sans graine vascularisées

Seedless Vascular Plants Were the First Tall Plants on Earth

Today, seedless vascular plants are represented by monilophytes and lycophytes. ...

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Education

Enseignement

JoVE Core

Biology

Biologie

Plant Biology

Biologie végétale

Plant Structure, Growth and Function

Structure, croissance et nutrition des plantes

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

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 also have true roots and leaves. These features helped them become the first tall plants on Earth.

Their life cycle is dominated by the diploid sporophyte, not the gametophyte. The sporophyte is the familiar fern plant that people usually notice. Seedless vascular plants still reproduce with spores, not seeds. They also do better in moist places because sperm need a thin film of water to reach the eggs.

Like animals and other plants, these plants alternate between meiosis and fertilization. Meiosis makes haploid cells, which have one set of chromosomes, from a diploid cell, which has two sets. Fertilization joins haploid gametes, such as sperm and eggs, to form a diploid zygote. In plants, both the haploid and diploid stages can be multicellular, which is called alternation of generations.

In seedless vascular plants, the diploid stage is the larger and more noticeable one. The sporophyte makes haploid spores by meiosis. A spore can grow into a gametophyte by mitosis. The gametophyte is smaller and less complex, but it can still photosynthesize and does not depend on the sporophyte for food or protection.

Most seedless vascular plants make one kind of spore. That spore develops into a bisexual gametophyte, which produces both egg and sperm cells by mitosis. When fertilization happens, a diploid zygote forms. The zygote then divides by mitosis and grows into the familiar fronded fern sporophyte, continuing the cycle.

Fern Life Cycles and Vascular Tissue

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

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

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

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...

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

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morphogenesis

Plant Flowering and Organ Identity

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light acquisition

How Plants Maximize Sunlight Capture

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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

Learn how seedless vascular plants use xylem, phloem, spores, and alternation of generations, with ferns as the best-known example.

Fern Life Cycles and Vascular Tissue | 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

La collection JoVE Core Biologie donne vie à la biologie à travers plus de 300 leçons vidéos animées concises et faciles à comprendre qui expliquent les concept clés de la biologie, mais aussi plus de 150 vidéos de scientifiques à l'action effectuant des expériences de recherche dans des laboratoires modernes.

SC.912.L.14.8

SC.912.L.14.10

SC.912.L.14.53.

Georgia Standards of Excellence

9-12

Botany

SBO1.

change-in-plant-straucture-through-geological-time

Change in plant straucture through geological time

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SC.912.L.14.1

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Cytoplasm

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Exocytosis

Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy.

While endocytosis takes particles ...

Relate structure to function for the components of plant and animal cells. Explain the role of cell membranes as a highly selective barrier (passive and active transport).

SC.912.L.14.2

Cell Structure

Background
Cells represent the most basic biological units of all organisms, whether it be simple, single-celled organisms like bacteria, or large, ...

Compare and contrast the general structures of plant and animal cells. Compare and contrast the general structures of prokaryotic and eukaryotic cells.

SC.912.L.14.3

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern ...

Introduction to Light Microscopy

The light microscope is an instrument used by researchers in many different fields to magnify specimens to as much as a thousand times their original ...

Overview of Electron Microscopy

The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can ...

phase-contrast-and-differential-interference-contrast-microscopy

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular ...

Compare and contrast structure and function of various types of microscopes.

SC.912.L.14.4

A. Cells have characteristic structures and functions that make them distinctive.

B. Processes in a cell can be classified broadly as growth, maintenance, reproduction, and homeostasis.

C. Life can be organized in a functional and structural hierarchy ranging from cells to the biosphere.

D. Most multicellular organisms are composed of organ systems whose structures reflect their particular function.

Fern Life Cycles and Vascular Tissue

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