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Rhizome
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An antique spurge plant, Euphorbia antiquorum, sending out white rhizomes

In botany and dendrology, a rhizome (/ˈraɪzoʊm/ RY-zohm)[note 1] is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks.[3] Rhizomes develop from axillary buds and grow horizontally. The rhizome also retains the ability to allow new shoots to grow upwards.[4]

A rhizome is the main stem of the plant that runs typically underground and horizontally to the soil surface.[5][6] Rhizomes have nodes and internodes and auxiliary buds.[7] Roots do not have nodes and internodes and have a root cap terminating their ends.[8] In general, rhizomes have short internodes, send out roots from the bottom of the nodes, and generate new upward-growing shoots from the top of the nodes. A stolon is similar to a rhizome, but stolon sprouts from an existing stem having long internodes and generating new shoots at the ends, they are often also called runners such as in the strawberry plant.[9]

Stolons growing from nodes from a corm of Crocosmia

A stem tuber is a thickened part of a rhizome or stolon that has been enlarged for use as a storage organ.[10] In general, a tuber is high in starch, e.g. the potato, which is a modified stolon. The term "tuber" is often used imprecisely and is sometimes applied to plants with rhizomes.

The plant uses the rhizome to store starches, proteins, and other nutrients. These nutrients become useful for the plant when new shoots must be formed or when the plant dies back for the winter.[4] If a rhizome is separated, each piece may be able to give rise to a new plant. This is a process known as vegetative reproduction and is used by farmers and gardeners to propagate certain plants. This also allows for lateral spread of grasses like bamboo and bunch grasses. Examples of plants that are propagated this way include hops, asparagus, ginger, irises, lily of the valley, cannas, and sympodial orchids.

Stored rhizomes are subject to bacterial and fungal infections, making them unsuitable for replanting and greatly diminishing stocks. However, rhizomes can also be produced artificially from tissue cultures. The ability to easily grow rhizomes from tissue cultures leads to better stocks for replanting and greater yields.[11] The plant hormones ethylene and jasmonic acid have been found to help induce and regulate the growth of rhizomes, specifically in rhubarb. Ethylene that was applied externally was found to affect internal ethylene levels, allowing easy manipulations of ethylene concentrations.[12] Knowledge of how to use these hormones to induce rhizome growth could help farmers and biologists to produce plants grown from rhizomes, and more easily cultivate and grow better plants.

Some plants have rhizomes that grow above ground or that lie at the soil surface, including some Iris species as well as ferns, whose spreading stems are rhizomes. Plants with underground rhizomes include gingers, bamboo, snake plant, the Venus flytrap, Chinese lantern, western poison-oak,[13] hops, and Alstroemeria, and some grasses, such as Johnson grass, Bermuda grass, and purple nut sedge. Rhizomes generally form a single layer, but in giant horsetails, can be multi-tiered.[14]

Turmeric rhizome, whole and ground into a spice

Many rhizomes have culinary value, and some, such as zhe'ergen, are commonly consumed raw.[15] Some rhizomes that are used directly in cooking include ginger,[16] turmeric,[17] galangal,[18] fingerroot, lotus and wasabi.

See also

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Explanatory notes

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References

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Rhizome

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from Grokipedia
In and , a rhizome is a modified subterranean that grows horizontally underground. Also known as a or creeping rootstalk, it sends out and shoots from its nodes. The rhizome itself produces both and stems, although it is not a root itself. The term originates from the rhízōma, meaning "mass of roots" or "fistful of roots". Rhizomes develop from axillary buds and feature distinct nodes and internodes, unlike true . They store starches and proteins, serving as reserves for new growth or during adverse conditions. Rhizomes facilitate vegetative , allowing the to spread and reproduce asexually if segments are separated. Common examples include ginger, , , , lotus, and .

Definition and Morphology

Definition

A rhizome is a horizontal, subterranean stem that grows parallel to the ground surface, typically just below the , and produces from its lower surface and shoots from buds at its nodes. This structure distinguishes it from true , which lack nodes and buds, and from aerial stems, which grow above ground. The term "rhizome" derives etymologically from the ῥίζωμα (rhízōma), meaning a "mass of ," reflecting its root-like appearance despite being a stem. It entered English botanical usage in the early , with the earliest recorded instance in 1833. Key characteristics of rhizomes include their nature, allowing long-term persistence; frequent thickening to support structural integrity; and capacity for elongation and branching, which enables lateral spread. These features contribute to their role as foundational organs in many plant species, though detailed growth patterns vary.

Structural Features

Rhizomes possess a stem-like , featuring prominent nodes and internodes that define their segmented structure. Nodes serve as key sites for the emergence of adventitious and lateral shoots, enabling the horizontal extension of the . Internodes, the elongated regions between nodes, vary in length and thickness depending on the , contributing to the overall flexibility and elongation of the rhizome. At each node, rhizomes typically bear small, scale-like leaves called cataphylls, which are membranous or papery structures that enclose and protect the axillary buds and developing shoots. These cataphylls often persist, forming a protective sheath around the rhizome. The vascular system of rhizomes mirrors that of stems, with bundles containing and arranged in parallel or scattered patterns, rather than the central typical of . In monocotyledonous rhizomes, such as those in grasses and gingers, vascular bundles are scattered throughout the ; in dicotyledonous examples, they may form a more organized ring near the periphery. This arrangement supports efficient transport while accommodating the underground environment. Externally, rhizomes commonly exhibit a tough, or reddish-brown covered in scales from dried cataphylls or a corky periderm, providing against soil abrasion and pathogens. Internally, the tissue is dominated by large-celled , which forms the bulk of the cortex and , offering structural support and space for nutrient reserves. Rhizomes display structural variations in their growth architecture, categorized as monopodial or sympodial forms. Monopodial rhizomes grow linearly from a single dominant axis, producing lateral branches sparingly, as seen in some temperate grasses. In contrast, sympodial rhizomes branch repeatedly from multiple apices, creating a clustered or networked system, common in tropical species like gingers and bamboos. These forms influence the overall density and spread of the rhizome system.

Growth and Reproduction

Growth Mechanisms

Rhizomes expand horizontally through the continuous activity of apical meristems positioned at their growing tips, which generate new cells via to elongate the structure and penetrate . These meristems are protected by scale leaves and produce internodes interspersed with nodes, where dormant axillary remain inactive until triggered. Upon activation, these dormant buds at the nodes develop into new apical meristems, forming lateral branches that enable the rhizome system to spread and ramify underground. The nodes, a key structural feature, serve as sites for this bud activation, supporting modular growth patterns. Environmental cues modulate the pace and direction of rhizome growth by influencing function and sensitivity. Optimal conditions, such as well-aerated, nutrient-rich loams with adequate , facilitate meristem division and reduce physical resistance to elongation. Temperatures in the range of 15-25°C are generally optimal for growth in many rhizomatous species by boosting metabolic rates in meristematic cells, whereas extremes inhibit activity; for instance, in ( longistaminata), temperatures of 28-30°C increase rhizome length but delay bud compared to 17-19°C, while at 30-32°C is excessively delayed with shorter rhizomes. Growth rates vary by species but illustrate the efficiency of these mechanisms, with exemplifying rapid extension. In Phyllostachys pubescens, annual rhizome elongation averages 1.27 meters per branch, with maximum extensions reaching 3.67 meters, driven by seasonal flushes of activity in spring and summer. Such rates enable to colonize expansive areas, underscoring the adaptive prowess of rhizome systems in resource acquisition.

Vegetative Propagation

Rhizomes enable through a process known as fragmentation, in which portions of the break apart, often due to environmental disturbances like or animal activity. Each viable segment must contain at least one node, the jointed points along the rhizome where adventitious buds are located; these buds can then sprout new shoots and , developing into independent that are genetically identical clones of the parent. This method allows for efficient spread without reliance on seeds, as even small fragments as short as a few centimeters can regenerate if they include a node. The resulting clonal populations from rhizome fragmentation typically exhibit low , as all inherit the exact same as the original plant. This uniformity can increase vulnerability to diseases and pests, since a effective against one clone may devastate the entire population lacking resistant variants. Studies on clonal have shown that such genetic homogeneity heightens susceptibility to epidemics, underscoring the between rapid propagation and long-term resilience. In natural settings, this propagation contributes to the invasive spread of species like johnsongrass (Sorghum halepense), where rhizome segments detached during cultivation or establish new colonies, forming dense stands that outcompete native vegetation. Human-assisted methods further exploit this process in by intentionally dividing mature rhizomes into node-containing pieces, which are then replanted to propagate crops such as ginger (Zingiber officinale) or ornamental bamboos, ensuring uniform yields and true-to-type offspring.

Functions and Adaptations

Nutrient Storage and Survival

Rhizomes function as key storage organs in many perennial plants, where specialized cells in the thickened internodes accumulate essential nutrients and water reserves. These cells, often located around vascular bundles, primarily store starches in the form of grains within amyloplasts, alongside proteins and oils, providing a reservoir for metabolic needs during periods of low photosynthetic activity. in these cells also contributes to maintaining turgor and cellular integrity underground. The capability of rhizomes plays a critical role in plant survival amid adverse environmental conditions, including , , and . During , rhizomes conserve resources by increasing dry matter content and relying on stored non-structural carbohydrates, allowing viability even after substantial loss—such as drying to 40% of initial weight in species like johnsongrass. tolerance is enhanced by the underground position of rhizomes, which insulates them from surface freezing; in canna lilies, rhizomes endure light frosts if mulched, preventing and cellular damage. Similarly, shallow rhizomes in fire-prone habitats, such as those of fireweed, survive relatively intense surface fires due to their burial in mineral soil, protecting storage tissues from lethal heat. Energy mobilization from rhizome reserves is essential for seasonal regrowth, particularly the conversion of stored carbohydrates into usable forms to emerging shoots. In winter, rhizomes of perennials like common reed accumulate and soluble sugars, which are hydrolyzed and translocated in spring to support rapid shoot elongation before full canopy development. This process, observed in species such as Schoenoplectus lacustris (L.) Palla, involves enzymatic breakdown of —accounting for up to 15% of fresh weight—to provide energy when above-ground is limited. This nutrient storage and mechanism confers a significant evolutionary advantage to , promoting by buffering against environmental stressors and enabling repeated cycles of growth without annual reseeding. In perennial herbs, reliance on rhizomes for resource hoarding and clonal persistence extends lifespan, often spanning decades, as seen in clonal where underground storage organs mitigate mortality risks from disturbance. Such adaptations have facilitated the dominance of rhizomatous perennials in unstable habitats, enhancing overall resilience.

Ecological Roles

Rhizomes play crucial roles in shaping plant communities and dynamics through their extensive underground networks, which facilitate interactions with , other organisms, and environmental disturbances. These horizontal structures, often extending far from the parent , contribute to community stability and resilience while also influencing composition in various habitats. In , rhizomes form dense mats that bind particles, preventing and enhancing in vulnerable areas such as slopes and shorelines. For instance, like maidencane (Panicum hemitomon) develop robust rhizome systems that trap sediment and reduce water-induced loss in environments. Similarly, rhizomatous grasses such as Kentucky bluegrass () effectively fill disturbed spots and maintain integrity through lateral spread. Laterally extending rhizomes are particularly adept at mitigating surface compared to vertical systems. Rhizomes enable rapid invasion dynamics, allowing plants to colonize and dominate disturbed habitats, especially in wetlands. The invasive common reed (Phragmites australis) exemplifies this, spreading aggressively via long rhizomes and stolons that fragment and establish new clones in areas altered by human activity or natural disruption. These rhizomes facilitate quick expansion into ditches, riparian zones, and degraded wetlands, forming monotypic stands that alter hydrologic patterns. Regarding biodiversity impacts, rhizomatous species can outcompete native , leading to reduced in invaded areas. Non-native displaces indigenous , suppresses understory growth, and diminishes overall plant and animal diversity by forming impenetrable thickets. Conversely, rhizomes support microbial habitats in the , fostering diverse bacterial and fungal communities that enhance nutrient cycling and . These microbial associations, enriched by root exudates from rhizomatous tissues, can promote functions like and . Rhizomes aid recovery from disturbances, particularly fires, by enabling resprouting from protected underground tissues. Many graminoids and shrubs with rhizomes rapidly regenerate post-fire, restoring cover and preventing secondary . For example, rhizomatous grasses resprout from surviving meristems, contributing to quicker rebound in fire-prone ecosystems compared to non-resprouting .

Examples and Diversity

In Monocotyledons

Rhizomes are particularly prevalent among monocotyledons, a group comprising approximately 60,000 that represent about one-quarter of all flowering . Many monocots are geophytic, utilizing rhizomes as underground storage organs for nutrients and water, which enable during adverse conditions and subsequent regrowth. This adaptation is especially common in families such as (grasses), (irises), and (gingers), where rhizomes support horizontal growth and resource allocation belowground. In the family, rhizomes are key to the vegetative spread of many grasses, allowing for extensive clonal colonies through lateral extension from nodes. For instance, bamboos in the subfamily Bambusoideae develop robust rhizome networks that can extend several meters annually, producing new culms and facilitating rapid habitat colonization. Similarly, in the palm genus Calamus (), sympodial rhizome systems produce irregularly branched underground structures from which erect climbing stems arise, allowing the rattans to colonize forest canopies. In , the rhizome of officinale (ginger) forms a compact, branched structure with thickened nodes that store and essential oils, exemplifying the family's typical sympodial growth pattern. Irises in , such as those in the genus Iris, arise from fleshy, creeping rhizomes that bear scale-like leaves and adventitious roots, promoting clump formation and seasonal renewal. A notable adaptation occurs in Orchidaceae, where sympodial rhizomes drive horizontal expansion, particularly in epiphytic species that attach to tree bark and produce new pseudobulbs or shoots sequentially. This growth habit allows orchids to optimize light capture and resource uptake in arboreal environments, contrasting with the more subterranean forms in terrestrial monocots. Rhizomes across these monocot groups also enable vegetative propagation, as segments with buds can develop into independent plants.

In Dicotyledons and Other Groups

In dicotyledons, rhizomes are less prevalent than in monocots but play key roles in vegetative propagation and resource storage in certain families. For instance, the sacred lotus () in the family develops thick, horizontal rhizomes that function as modified , enabling the plant to spread across aquatic environments and store nutrients for perennial growth. These rhizomes support the emergence of leaves and flowers from the water surface while facilitating clonal reproduction through fragmentation. Among ferns and allies, rhizomes are a dominant growth form, providing for spore-producing fronds and enabling rapid colonization. The bracken fern (Pteridium aquilinum) exemplifies this with its extensive, deep-reaching, woody rhizomes that creep horizontally up to 20 feet long and 10 feet deep, forming dense colonies and resisting environmental stresses like fire. These rhizomes bear scaly surfaces and produce adventitious , sustaining frond development and spore dispersal across disturbed habitats. In Pteridium, the rhizomes also mobilize , enhancing nutrient availability for the fern's prothallia and gametophytes. Rhizomes occur rarely in gymnosperms, where subterranean stems in some cycads provide limited horizontal growth akin to rhizomatous extension, though most rely on thickened or coralloid roots for anchorage and . These adaptations underscore rhizomes' versatility in non-monocot groups for survival in diverse ecological niches.

Comparisons with Similar Structures

Distinction from Roots and Bulbs

Rhizomes differ fundamentally from in their structure and orientation, as they are modified stems rather than organs specialized for anchorage and absorption. While roots typically grow downward in response to geotropism and lack nodes, buds, or leaves, rhizomes exhibit horizontal growth and possess distinct nodes from which adventitious roots, shoots, and scale leaves emerge. This stem-like organization allows rhizomes to function in both vegetative and storage, contrasting with the simpler, non-segmented of roots that prioritize nutrient uptake from . In comparison to bulbs, rhizomes are elongated and horizontally oriented , whereas bulbs are compact, vertical storage structures composed primarily of modified, fleshy leaves surrounding a central . Bulbs, such as those of onions or tulips, feature a short axis with overlapping leaf scales that store nutrients, but lack the extended, node-bearing form characteristic of rhizomes like those in irises or ginger. This distinction in morphology prevents confusion, as bulbs produce new growth from the apex in a more upright manner, while rhizomes propagate laterally along their length. Common misidentifications arise due to the underground habit of both rhizomes and roots, exemplified by ginger (Zingiber officinale), which is frequently called "ginger root" in culinary contexts but is botanically a rhizome—an with knobby nodes and scale leaf scars. Similarly, some rhizomes may superficially resemble bulbs in their storage role, but their irregular, branching shape and horizontal extension clarify the difference. To diagnose a rhizome accurately, examine for the presence of nodes marked by bud scars or scale leaves, which are absent in true roots, and note the orientation of vascular bundles, which in rhizomes align as in stems (scattered or ringed with external to ) rather than the central typical of roots. These features, including the emergence of leaves or shoots from nodes, confirm the stem nature of rhizomes over root or structures.

Relation to Stolons and Tubers

Rhizomes and stolons are both horizontal, modified stems that facilitate vegetative propagation in , often serving as runners that extend the plant's reach and produce new shoots from nodes. However, stolons typically grow above ground or at the surface, are thinner and more slender, and are generally annual structures that root at their tips to form independent plantlets, whereas rhizomes are thicker, , and predominantly subterranean, allowing for longer-term persistence and branching below the . In contrast to tubers, which are short, swollen tips of underground stems or roots specialized for nutrient storage and featuring buds (eyes) primarily at the apex—such as in the potato (Solanum tuberosum)—rhizomes are elongated horizontal stems with multiple nodes along their length that can produce adventitious roots and shoots at various points, enabling more distributed growth and regeneration. These structures exist along a continuum of strategies in clonal , where stolons represent more ephemeral, above-ground dispersal mechanisms, rhizomes emphasize persistent underground expansion, and tubers focus on compact storage for seasonal , with transitional forms blurring the boundaries based on environmental pressures. Evolutionarily, rhizomes, stolons, and tubers share origins in the modification of shoot apical meristems within ancestral vascular , adapting horizontal stem growth for clonal to enhance in diverse habitats, as seen in the diversification of these organs across angiosperm lineages.

Human Uses and Significance

Horticultural Applications

Rhizomes are widely utilized in for propagating plants, particularly through division techniques that leverage their modular growth structure. Gardeners typically divide established rhizomes in early spring before new shoots emerge, cutting them into sections each containing at least one or growing point to ensure viability. These divisions are then planted at level, with the top of the rhizome exposed to prevent rot, allowing the plant to establish quickly in prepared beds. This method is especially effective for species like irises and peonies, promoting vigorous regrowth and clonal expansion without relying on seeds. In ornamental , rhizomatous perennials serve as versatile ground covers and border plants, enhancing aesthetics with their spreading habit and foliage interest. (Hosta spp.), for instance, form dense mats through rhizome extension, providing shade-tolerant coverage in woodland gardens and suppressing weeds effectively. Similarly, ferns such as ostrich fern (Matteuccia struthiopteris) utilize rhizomes to create naturalistic drifts, valued for their textural contrast in mixed borders. These applications capitalize on the rhizome's ability to store nutrients during , enabling reliable emergence each season. Managing the aggressive spread of certain rhizomatous plants presents a key challenge in garden settings, requiring containment strategies to prevent overgrowth. Mint ( spp.), notorious for its invasive rhizomes that can extend up to 2 feet per season, often necessitates planting in sunken barriers or containers to restrict lateral growth. or mowing above ground does little to curb underground expansion, so physical barriers like corrugated metal edging, buried 12-18 inches deep, are recommended for control. Optimal care for rhizomatous ornamentals emphasizes well-drained to avoid waterlogging, which can lead to rhizome decay, supplemented by organic to retain moisture and suppress weeds. Regular division every 3-5 years rejuvenates clumps by alleviating overcrowding, improving bloom quality and preventing central die-out in species like bearded iris (Iris germanica). Fertilization with balanced, slow-release formulas in spring supports nutrient uptake from the rhizome reserves, fostering healthy establishment.

Economic and Medicinal Value

Rhizomes serve as vital economic resources in , particularly through major food crops like (Curcuma longa) and ginger (Zingiber officinale), where they are harvested for use as spices and natural dyes. rhizomes, rich in , are primarily valued for their vibrant yellow pigment and flavoring properties in culinary applications worldwide. dominates global production, accounting for approximately 80% of the world's supply and consuming the majority domestically, with output reaching 1.334 million metric tons in 2021-22 and exports of 0.153 million metric tons. The global turmeric market was valued at USD 4.9 billion in 2025, projected to grow to USD 8.4 billion by 2035 due to rising demand in food, pharmaceuticals, and . Similarly, ginger rhizomes are a staple in global , with total world production exceeding 4.9 million metric tons annually, led by at 2.225 million metric tons and at 0.768 million metric tons in recent years. The international ginger trade reached USD 1.34 billion in 2023, reflecting a 19.9% increase from the previous year, driven by their use in beverages, , and processed foods. Medicinally, rhizomes from plants like ginger and licorice (Glycyrrhiza glabra) have established therapeutic value, supported by clinical evidence and traditional uses. Ginger rhizomes are widely recognized for their effects, with systematic reviews of randomized controlled trials confirming significant relief from pregnancy-induced, postoperative, and chemotherapy-related nausea and vomiting compared to . Active compounds such as gingerols enhance gastrointestinal and block serotonin receptors, contributing to these benefits. Licorice rhizomes, often harvested as root-rhizome hybrids, are utilized for their expectorant properties in treating respiratory conditions like coughs and , owing to , which soothes mucous membranes and exhibits effects. Global production of licorice occurs in countries including , , and , with derivatives generating substantial revenue—up to USD 40 million annually in foreign exchange for Iran alone—through applications in pharmaceuticals, , and flavoring. In the ornamental sector, iris rhizomes (Iris spp.) contribute to the industry, valued for their aesthetic appeal in and cut-flower production. Species like Iris germanica are commercially propagated for gardens and floral arrangements, supporting a segment of the global ornamental market, which exceeded USD 27 billion in 2021 and is expected to reach USD 45 billion by 2029. Rhizome division enables efficient multiplication, making irises a high-value in nurseries, particularly in and , where they enhance in horticultural exports. Sustainability challenges in rhizome harvesting include overexploitation of wild populations for medicinal purposes, which threatens species like licorice through degradation and reduced regeneration rates. For cultivated staples like ginger and , intensive farming raises concerns over nutrient depletion and use, though large-scale production mitigates wild overharvesting; global efforts focus on to balance economic demands with long-term viability.

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  70. https://extension.illinois.edu/flowers/bulbs
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  72. https://ucanr.edu/blog/napa-master-gardener-column/article/spring-flowering-bulbs-corms-tubers-and-rhizomes
  73. https://extension.psu.edu/the-cool-season-turfgrasses-basic-structures-growth-and-development
  74. https://extension.umn.edu/how/planting-bulbs-tubers-and-rhizomes
  75. https://pubmed.ncbi.nlm.nih.gov/31505049/
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