Clonal colony

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A clonal colony of Iris germanica-note the rhizomatous stems by which the plant reproduces. Clonal colony of Iris germanica.jpg
A clonal colony of Iris germanica -note the rhizomatous stems by which the plant reproduces.

A clonal colony or genet is a group of genetically identical individuals, such as plants, fungi, or bacteria, that have grown in a given location, all originating vegetatively, not sexually, from a single ancestor. In plants, an individual in such a population is referred to as a ramet. In fungi, "individuals" typically refers to the visible fruiting bodies or mushrooms that develop from a common mycelium which, although spread over a large area, is otherwise hidden in the soil. Clonal colonies are common in many plant species. Although many plants reproduce sexually through the production of seed, reproduction occurs by underground stolons or rhizomes in some plants. Above ground, these plants most often appear to be distinct individuals, but underground they remain interconnected and are all clones of the same plant. However, it is not always easy to recognize a clonal colony especially if it spreads underground and is also sexually reproducing.

Contents

Methods of establishment

With most woody plants, clonal colonies arise by wide-ranging roots that at intervals send up new shoots, termed suckers. Trees and shrubs with branches that may tend to bend and rest on the ground, or which possess the ability to form aerial roots can form colonies via layering, or aerial rooting, e. g. willow, blackberry, fig, and banyan. Some vines naturally form adventitious roots on their stems that take root in the soil when the stems contact the ground, e.g. ivy and trumpet vine. With other vines, rooting of the stem where nodes come into contact with soil may establish a clonal colony, e.g. Wisteria. Ferns and many herbaceous flowering plants often form clonal colonies via horizontal underground stems termed rhizomes, e.g. ostrich fern Matteuccia struthiopteris and goldenrod. A number of herbaceous flowering plants form clonal colonies via horizontal surface stems termed stolons, or runners; e.g. strawberry and many grasses. Non-woody plants with underground storage organs such as bulbs and corms can also form colonies, e.g. Narcissus and Crocus . A few plant species can form colonies via adventitious plantlets that form on leaves, e.g. Kalanchoe daigremontiana and Tolmiea menziesii . A few plant species can form colonies via asexual seeds, termed apomixis, e.g. dandelion.[ citation needed ]

Record colonies

The only known natural example of King's Lomatia (Lomatia tasmanica) found growing in the wild is a clonal colony in Tasmania estimated to be 43,600 years old. [1]

A group of 47,000 Quaking Aspen (Populus tremuloides) trees (nicknamed "Pando") in the Wasatch Mountains, Utah, United States, has been shown to be a single clone connected by the root system. It is sometimes considered the world's largest organism by mass, covering 106 acres (43 ha), and also as among the world's oldest living organisms, at an estimated 14,000 years old, [2] though a more recent publication suggests the colony may be 80,000 years old. [3] It is however possible that undiscovered clonal colonies of trees rival or exceed its size and/or age.[ citation needed ]

Another possible candidate for oldest organism on earth is an underwater meadow of the marine plant Posidonia oceanica in the Mediterranean Sea, which could be up to 100,000 years of age. [4]

Examples

When woody plants form clonal colonies, they often remain connected through the root system, sharing roots, water and mineral nutrients. A few non-vining, woody plants that form clonal colonies are Bigelow oak (Quercus sinuata var. breviloba), [5] quaking aspen (Populus tremuloides), bayberry (Myrica pensylvanica), black locust (Robinia pseudoacacia), creosote bush (Larrea tridentata), bladdernut, blueberry (Vaccinium), devil's club (Oplopanax horridus), forsythia, hazelnut (Corylus), honey locust (Gleditsia triacanthos), Kentucky coffeetree (Gymnocladus dioicus), kerria (Kerria japonica), pawpaw (Asimina triloba), poplars (Populus), sassafras (Sassafras albidum), sumac (Rhus), sweetgum ( Liquidambar styraciflua ), and sweetshrub (Calycanthus floridus).[ citation needed ]

See also

Related Research Articles

<span class="mw-page-title-main">Root</span> Basal organ of a vascular plant

In vascular plants, the roots are the organs of a plant that are modified to provide anchorage for the plant and take in water and nutrients into the plant body, which allows plants to grow taller and faster. They are most often below the surface of the soil, but roots can also be aerial or aerating, that is, growing up above the ground or especially above water.

<span class="mw-page-title-main">Tuber</span> Storage organ in plants

Tubers are a type of enlarged structure used as storage organs for nutrients in some plants, usually stems, but some definitions refer to roots. Tubers help plants perennate, provide energy and nutrients, and are a means of asexual reproduction.

<i>Populus <span style="font-style:normal;">sect.</span> Populus</i> Section of plants

Populus section Populus, of the Populus (poplar) genus, includes the aspen trees and the white poplar Populus alba. The five typical aspens are all native to cold regions with cool summers, in the north of the Northern Hemisphere, extending south at high altitudes in the mountains. The White Poplar, by contrast, is native to warmer regions, with hot, dry summers. These trees are all medium-sized deciduous trees ranging 15–30 metres (49–98 ft) tall.

<span class="mw-page-title-main">Rhizome</span> Underground stem in which various plants asexually reproduce via budding

In botany and dendrology, a rhizome is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow horizontally. The rhizome also retains the ability to allow new shoots to grow upwards.

<span class="mw-page-title-main">Vegetative reproduction</span> Asexual method of reproduction in plants

Vegetative reproduction is a form of asexual reproduction occurring in plants in which a new plant grows from a fragment or cutting of the parent plant or specialized reproductive structures, which are sometimes called vegetative propagules.

<span class="mw-page-title-main">Corm</span> Underground plant stem

Corm, bulbo-tuber, or bulbotuber is a short, vertical, swollen underground plant stem that serves as a storage organ that some plants use to survive winter or other adverse conditions such as summer drought and heat (perennation).

<span class="mw-page-title-main">Aerial root</span> Root which grows above the ground

Aerial roots are roots above the ground. They are almost always adventitious. They are found in diverse plant species, including epiphytes such as orchids (Orchidaceae), tropical coastal swamp trees such as mangroves, banyan figs, the warm-temperate rainforest rata, and pohutukawa trees of New Zealand. Vines such as common ivy and poison ivy also have aerial roots.

<span class="mw-page-title-main">Stolon</span> Horizontal connections between organisms

In biology, stolons, also known as runners, are horizontal connections between parts of an organism. They may be part of the organism, or of its skeleton. Typically, animal stolons are exoskeletons.

Fragmentation in multicellular or colonial organisms is a form of asexual reproduction or cloning, where an organism is split into fragments upon maturation and the spilted part becomes the new individual.

<span class="mw-page-title-main">Basal shoot</span> Shoot growing from an adventitious bud

Basal shoots, root sprouts, adventitious shoots, and suckers are words for various kinds of shoots that grow from adventitious buds on the base of a tree or shrub, or from adventitious buds on its roots. Shoots that grow from buds on the base of a tree or shrub are called basal shoots; these are distinguished from shoots that grow from adventitious buds on the roots of a tree or shrub, which may be called root sprouts or suckers. A plant that produces root sprouts or runners is described as surculose. Water sprouts produced by adventitious buds may occur on the above-ground stem, branches or both of trees and shrubs. Suckers are shoots arising underground from the roots some distance from the base of a tree or shrub.

<i>Populus tremuloides</i> Species of deciduous tree native to cooler areas of North America

Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name aspen. It is commonly called quaking aspen, trembling aspen, American aspen, mountain or golden aspen, trembling poplar, white poplar, and popple, as well as others. The trees have tall trunks, up to 25 metres tall, with smooth pale bark, scarred with black. The glossy green leaves, dull beneath, become golden to yellow, rarely red, in autumn. The species often propagates through its roots to form large clonal groves originating from a shared root system. These roots are not rhizomes, as new growth develops from adventitious buds on the parent root system.

Plant reproduction is the production of new offspring in plants, which can be accomplished by sexual or asexual reproduction. Sexual reproduction produces offspring by the fusion of gametes, resulting in offspring genetically different from either parent. Asexual reproduction produces new individuals without the fusion of gametes, resulting in clonal plants that are genetically identical to the parent plant and each other, unless mutations occur.

<i>Populus tremula</i> Species of plant

Populus tremula is a species of poplar native to cool temperate regions of the Old World.

This page provides a glossary of plant morphology. Botanists and other biologists who study plant morphology use a number of different terms to classify and identify plant organs and parts that can be observed using no more than a handheld magnifying lens. This page provides help in understanding the numerous other pages describing plants by their various taxa. The accompanying page—Plant morphology—provides an overview of the science of the external form of plants. There is also an alphabetical list: Glossary of botanical terms. In contrast, this page deals with botanical terms in a systematic manner, with some illustrations, and organized by plant anatomy and function in plant physiology.

Important structures in plant development are buds, shoots, roots, leaves, and flowers; plants produce these tissues and structures throughout their life from meristems located at the tips of organs, or between mature tissues. Thus, a living plant always has embryonic tissues. By contrast, an animal embryo will very early produce all of the body parts that it will ever have in its life. When the animal is born, it has all its body parts and from that point will only grow larger and more mature. However, both plants and animals pass through a phylotypic stage that evolved independently and that causes a developmental constraint limiting morphological diversification.

<span class="mw-page-title-main">Plant stem</span> Structural axis of a vascular plant

A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports water and dissolved substances between the roots and the shoots in the xylem and phloem, photosynthesis takes place here, stores nutrients, and produces new living tissue. The stem can also be called halm or haulm or culms.

<i>Populus grandidentata</i> Species of deciduous tree native to North America

Populus grandidentata, commonly called large-tooth aspen, big-tooth aspen, American aspen, Canadian poplar, or white poplar, is a deciduous tree native to eastern North America.

<span class="mw-page-title-main">Pando (tree)</span> Largest known organism

Pando, the world's largest tree, is a quaking aspen tree located in Central Utah in the Fishlake National Forest. A male clonal organism, Pando has an estimated 47,000 stems (ramets) that appear as individual trees, but are connected by a root system that spans 106 acres. Pando is the largest tree by weight and landmass and, is the largest known aspen clone. Pando was identified as a single living organism because each of its stems possesses identical genetic markers. The massive interconnected root system coordinates energy production, defense and regeneration across its expanse. Pando spans 0.63 miles by 0.43 miles of the southwestern edge of the Fishlake Basin in the Fremont River Ranger District of the Fishlake National Forest and lies 0.43 miles to the west of Fish Lake, the largest natural mountain freshwater lake in Utah.

<span class="mw-page-title-main">Aspen</span> Common name for certain tree species

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References

  1. "Tasmanian bush could be oldest living organism". Discovery Channel. Archived from the original on 2006-07-23. Retrieved 2008-05-07.
  2. Mock, K. E.; Rowe, C. A.; Hooten, M. B.; Dewoody, J.; Hipkins, V. D. (November 2008). "Clonal dynamics in western North American aspen ( Populus tremuloides )". Molecular Ecology. 17 (22): 4827–4844. Bibcode:2008MolEc..17.4827M. doi:10.1111/j.1365-294X.2008.03963.x. PMID   19140975. S2CID   1425039.
  3. Shih, Han-Yu; Sciumè, Giuseppe; Poholek, Amanda C.; Vahedi, Golnaz; Hirahara, Kiyoshi; Villarino, Alejandro V.; Bonelli, Michael; Bosselut, Remy; Kanno, Yuka; Muljo, Stefan A.; O'Shea, John J. (September 2014). "Transcriptional and epigenetic networks of helper T and innate lymphoid cells". Immunological Reviews. 261 (1): 23–49. doi:10.1111/imr.12208. ISSN   0105-2896. PMC   4321863 . PMID   25123275.
  4. "Ibiza's Monster Marine Plant". Ibiza Spotlight. Retrieved 2008-05-07.
  5. Lance, Ron (2004). Woody Plants of the Southeastern United States: A Winter Guide. University of Georgia Press. ISBN   978-0-8203-2524-8.

Further reading