Name: plant features that limit water loss
Uploaded: 2026-08-26T08:20:34.350Z
Duration: 2 min 35 s
Channel: JoVE

K12 Standards

Virginia  Standards of Learning

HIgh School

Life Science

LS.7

LS.7.b

Adaptations that Reduce Water Loss

Su, bitkilerin fotosentez yapmas&#x131;, metabolize etmesi ve h&#xFC;cresel yap&#x131;y&#x131; s&#xFC;rd&#xFC;rmesi i&#xE7;in kritik &#xF6;neme sahiptir.
 Bu nedenle, a&#x15F;&#x131;r&#x131; su kayb&#x131; bitkiler i&#xE7;in sorunludur.
 Bitkilerin su kayb&#x131;na dayanmas&#x131; ve direnmesi i&#xE7;in hangi uyarlamalar geli&#x15F;ti? &#xC7;o&#x11F;u bitkinin yaprak y&#xFC;zeyini kaplayan ve suyun buharla&#x15F;mas&#x131;n&#x131; &#xF6;nleyen mumsu bir k&#xFC;tik&#xFC;l&#xFC; vard&#x131;r.
K&#xFC;tik&#xFC;l&#xFC;n spesifik bile&#x15F;imi suyunu etkiler.
 Stomata ad&#x131; verilen y&#xFC;zeydeki k&#xFC;&#xE7;&#xFC;k a&#xE7;&#x131;kl&#x131;klar, gaz de&#x11F;i&#x15F;imini ve terlemeyi kolayla&#x15F;t&#x131;r&#x131;r.
 Su kayb&#x131;n&#x131; en aza indirmek i&#xE7;in, bitkiler su ve &#x131;&#x15F;&#x131;k mevcudiyetine tepki olarak geli&#x15F;en yapraklardaki g&#xF6;zeneklerin yo&#x11F;unlu&#x11F;unu ve yerini ayarlar.
&#xC7;o&#x11F;u yaprak d&#xF6;ken a&#x11F;a&#xE7;larda, &#xF6;rne&#x11F;in, g&#xF6;zenekler yapraklar&#x131;n alt taraf&#x131;nda bulunur.
 Ek olarak, g&#xF6;zeneklerin yo&#x11F;unlu&#x11F;u a&#x11F;ac&#x131;n merkezine yak&#x131;n yapraklarda daha y&#xFC;ksek ve &#xE7;evresindekiler &#xFC;zerinde daha d&#xFC;&#x15F;&#xFC;kt&#xFC;r.
 Suyun korunmas&#x131; &#xF6;zellikle &#xE7;&#xF6;lde ya&#x15F;ayan bitkiler i&#xE7;in kritik &#xF6;neme sahiptir.
&#xC7;&#xF6;l &#xE7;al&#x131;s&#x131; - Encelia farinosa -, yapraklar&#x131;n&#x131;n etraf&#x131;ndaki suyu k&#xFC;&#xE7;&#xFC;k yaprak t&#xFC;yleriyle yakalar.
 Trikom denilen bu k&#x131;llar g&#xFC;ne&#x15F;i sapt&#x131;r&#x131;r ve r&#xFC;zgar&#x131;n kurutma etkisini azalt&#x131;r.
 Opuntia gibi di&#x11F;er &#xE7;&#xF6;l bitkileri, kurakl&#x131;&#x11F;a kar&#x15F;&#x131; korumak i&#xE7;in suyu etli g&#xF6;vdelerinde depolar.
Ek olarak, kakt&#xFC;sler, buharla&#x15F;may&#x131; azaltan ve &#x131;s&#x131;y&#x131; da&#x11F;&#x131;tan dikenler ad&#x131; verilen de&#x11F;i&#x15F;tirilmi&#x15F; yapraklara sahiptir.
 Kurak ortamlardaki bitkiler de sadece geceleri karbondioksit alarak buharla&#x15F;may&#x131; azaltabilir.
 G&#xFC;n boyunca g&#xF6;zenekler kapal&#x131; kal&#x131;r.
Bu s&#xFC;rece krassulasean asit metabolizmas&#x131; veya CAM denir.
 Belirli yaprak mimarileri de su kayb&#x131;n&#x131; azaltmaya yard&#x131;mc&#x131; olabilir.
 K&#xFC;&#xE7;&#xFC;k veya ince yapraklar buharla&#x15F;may&#x131; azalt&#x131;r.
&#xC7;imenler, benzer &#x15F;ekilde y&#xFC;zey alan&#x131;n&#x131; ve dolay&#x131;s&#x131;yla buharla&#x15F;may&#x131; azaltan haddelenmi&#x15F; veya katlanm&#x131;&#x15F; yaprak yap&#x131;lar&#x131; edinmi&#x15F;tir.

Buckley, Thomas N., Grace P. John, Christine Scoffoni ve Lawren Sack. "Yaprakların içindeki buharlaşma yerleri." Bitki Fizyolojisi 173, hayır. 3 (2017): 1763-1782. [<a href="https://www.ncbi.nlm.nih.gov/pubmed/28153921" target="_blank">Kaynak</a>]

Borland ve ark. "İklime dayanıklı tarımsal ormancılık: iklim değişikliğine fizyolojik tepkiler ve bir azaltma stratejisi olarak crassulacean asit metabolizmasının (CAM) mühendisliği." Bitki, Hücre ve Çevre 38, hayır. 9 (2015): 1833-1849. [<a href="https://www.ncbi.nlm.nih.gov/pubmed/25366937" target="_blank">Kaynak</a>]

Yang X ve ark. Daha sıcak ve daha kuru bir dünyada sürdürülebilir gıda ve biyoenerji üretimini geliştirmek için crassulacean asit metabolizması (CAM) üzerine araştırmalar için bir yol haritası. Yeni Phytol. 2015 Ağustos; 207(3):491-504. [<a href="https://www.ncbi.nlm.nih.gov/pubmed/26153373" target="_blank">Kaynak</a>]

Jalakas, Pirko, Ebe Merilo, Hannes Kollist ve Mikael Brosché. "Stoma Yoğunluğunun ABA Aracılı Düzenlenmesi OST1'den Bağımsızdır." Plant Direct 2, no. 9 (1 Eylül 2018). [<a href="https://doi.org/10.1002/pld3.82" target="_blank">Kaynak</a>]

su kaybını azaltan uyarlamalar

Bitki yapraklar&#x131;ndan buharla&#x15F;ma terlemeyi tetiklese de su kayb&#x131;na da neden olur. Su, fotosentetik reaksiyonlar ve di&#x11F;er h&#xFC;cresel s&#xFC;re&#xE7;ler i&#xE7;in kritik &#xF6;nem ta&#x15F;&#x131;d&#x131;&#x11F;&#x131;ndan, farkl&#x131; ortamlarda bitkiler &#xFC;zerindeki evrimsel bask&#x131;lar, su kayb&#x131;n&#x131; azaltan adaptasyonlar&#x131;n elde edilmesini sa&#x11F;lam&#x131;&#x15F;t&#x131;r.

Kara bitkilerinde, epidermis ad&#x131; verilen bitki yapra&#x11F;&#x131;n&#x131;n en &#xFC;stteki h&#xFC;cre tabakas&#x131;, k&#xFC;tik&#xFC;l ad&#x131; verilen mumsu bir maddeyle kapl&#x131;d&#x131;r. Bu hidrofobik katman, epidermal h&#xFC;creler taraf&#x131;ndan sentezlenen polimer k&#xFC;tin ve di&#x11F;er bitkilerden t&#xFC;retilmi&#x15F; mumlardan olu&#x15F;ur. Bu maddeler istenmeyen su kayb&#x131;n&#x131; ve gereksiz &#xE7;&#xF6;z&#xFC;nen maddelerin giri&#x15F;ini engeller. K&#xFC;tik&#xFC;l&#xFC;n &#xF6;zg&#xFC;l bile&#x15F;imi ve kal&#x131;nl&#x131;&#x11F;&#x131; bitki t&#xFC;r&#xFC;ne ve ortama g&#xF6;re de&#x11F;i&#x15F;ir. Di&#x11F;er yaprak adaptasyonlar&#x131; da, &#xF6;ncelikle y&#xFC;zey alan&#x131;n&#x131; azaltarak buharla&#x15F;may&#x131; en aza indirebilir. &#xD6;rne&#x11F;in baz&#x131; otlar&#x131;n su kayb&#x131;n&#x131; azaltan k&#x131;vr&#x131;ml&#x131; yap&#x131;s&#x131; vard&#x131;r. Alternatif olarak, di&#x11F;er &#xE7;im t&#xFC;rleri, buharla&#x15F;maya kar&#x15F;&#x131; korumak i&#xE7;in ayas&#x131;n&#x131;n yuvarlanmas&#x131;na maruz kal&#x131;r. &#xC7;&#xF6;lde ya&#x15F;ayan baz&#x131; bitkiler, su buhar&#x131;n&#x131; hapseden ve dolay&#x131;s&#x131;yla buharla&#x15F;may&#x131; azaltan mikroskobik t&#xFC;ylerle kapl&#x131; yapraklara sahiptir.

Su, &#xF6;ncelikle stoma ad&#x131; verilen bitki yapraklar&#x131;ndaki k&#xFC;&#xE7;&#xFC;k deliklerden buharla&#x15F;&#x131;r. Baz&#x131; bitkilerin stomalar&#x131;, onlar&#x131; a&#x15F;&#x131;r&#x131; &#x131;s&#x131;yla ili&#x15F;kili buharla&#x15F;madan koruyarak, yaln&#x131;zca yaprak y&#xFC;zeyinin alt k&#x131;sm&#x131;nda bulunur. Di&#x11F;er bitkiler, yapraklar&#x131;ndaki &#xE7;ukurlarda bulunan stomalar&#x131;n yak&#x131;n&#x131;nda su buhar&#x131;n&#x131; hapsederek, stoma a&#xE7;&#x131;kl&#x131;&#x11F;&#x131;n&#x131; &#xE7;evreleyen bek&#xE7;i h&#xFC;creler ba&#x11F;&#x131;l nemi alg&#x131;layabildi&#x11F;inden, buharla&#x15F;mal&#x131; su kayb&#x131;n&#x131; azalt&#x131;r. Baz&#x131; &#xE7;&#xF6;l bitkileri stomalar&#x131;n&#x131; yaln&#x131;zca buharla&#x15F;man&#x131;n daha az oldu&#x11F;u geceleri a&#xE7;ar. Bu stratejiye Krassulasean Asit Metabolizmas&#x131; (KAM) ad&#x131; verilir ve onu kullanan bitkiler geceleri karbondioksiti yakalay&#x131;p sabitler ve g&#xFC;n boyunca &#x131;&#x15F;&#x131;&#x11F;a ba&#x11F;l&#x131; fotosentetik reaksiyonlar y&#xFC;r&#xFC;t&#xFC;r. Baz&#x131; bilim insanlar&#x131;, k&#xFC;resel s&#x131;cakl&#x131;klar&#x131;n artmas&#x131;yla ili&#x15F;kili buharla&#x15F;may&#x131; azaltma &#xE7;abas&#x131; olarak KAM kullanarak karbon fiksasyonunu fotosentezden ay&#x131;rmak i&#xE7;in biyom&#xFC;hendislik tesisleri &#xF6;nermektedirler.

Su Kaybını Azaltan Uyarlamalar

Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and ...

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Education

JoVE Core

Biology

Biyoloji

Plant Biology

Bitki Biyolojisi

Plant Structure, Growth and Function

Bitki Yapısı, Büyümesi ve Beslenmesi

KEY TERMS AND CONCEPTS

TEMEL TERİMLER VE KAVRAMLAR

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 thickness and makeup vary with plant species and growing conditions.

Some plants also reduce water loss by changing leaf shape. Certain grasses have folded leaves, and others roll their leaf blades to limit evaporation. Desert plants may have microscopic hairs on their leaves that trap water vapor and slow water loss.

Most water leaves a plant through stomata, which are tiny openings in the leaf. In some plants, stomata are found only on the lower leaf surface, where they are less exposed to heat. Other plants place stomata in pits, where trapped water vapor raises humidity around the guard cells and lowers evaporation.

A few desert plants use Crassulacean Acid Metabolism, or CAM. These plants open their stomata at night, when evaporation is lower, and capture carbon dioxide then. During the day, they carry out the light-dependent reactions of photosynthesis. Scientists have also suggested using CAM in bioengineering to help plants cope with warming global temperatures.

Plant Features That Limit Water Loss

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

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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...

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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...

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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

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light acquisition

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water and mineral acquisition

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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 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 leaf cuticle, stomata, leaf shape, hairs, and CAM photosynthesis adaptations that help plants reduce water loss in dry environments.

Plant Features That Limit Water Loss | JoVE K12

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JoVE Core serisi, biyolojinin ana konseptlerini açıklayan 300 adet kısa ve kolay anlaşılabilir olan video dersleriyle ve günümüz laboratuvarlarında yürütülen gerçek araştırmaları gösteren 150'den fazla \"bilim insanları iş başında\" videolarıyla biyolojiye hayat vermektedir.

Florida Department of Education

High School

SC.912.L.14

SC.912.L.14.7

Georgia Standards of Excellence

9-12

Botany

SBO1.

Transport

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Responses to Gravity and Touch

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Plant Features That Limit Water Loss

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