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Euryale ferox
Euryale ferox
Euryale ferox
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Euryale ferox
Euryale ferox in Himi, Toyama, Japan
Flower
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Order: Nymphaeales
Family: Nymphaeaceae
Genus: Euryale
Salisb.
Species:
E. ferox
Binomial name
Euryale ferox
Synonyms[2]
  • Anneslea spinosa Andrews
  • Euryale ferox f. ussuriense Regel
  • Euryale indica Planch.

Euryale ferox, commonly known as prickly waterlily,[3] makhānā, or Gorgon plant, is a species of water lily found in southern and eastern Asia, and the only extant member of the genus Euryale. The edible seeds, called fox nuts or gorgon nuts, are dried and eaten predominantly in Asia.

The plant is cultivated for its seeds in lowland ponds in India, China, and Japan. The Indian state of Bihar produces 90% of the world's fox nuts. The Chinese have cultivated the plant for centuries. In India, more than 96,000 hectares of Bihar were set aside for cultivation of Euryale in 1990–1991. In the northern and western parts of India, the seeds are often roasted or fried like popcorn.

Description

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Euryale ferox grows in freshwater ponds. The leaves are large, round and peltate, often more than 1 m (3 ft) across, sometimes to 2.7 m (9 ft) diameter, with a distinctive puckered top. The stalk is at the centre on the underside.[4][5] The leaves are deep green; the leaf veins are purplish. The stems and leaves are covered in sharp prickles. The flowers are 5 cm diameter, with violet outer petals and white inner petals; they often pierce through the leaves. The fruit is a spiny capsule 5–10 cm diameter, containing numerous spongy-textured seeds.[4] It grows in rich soil under water. It does not tolerate shade or cold during the growing season, though when dormant in winter it is not harmed by severe winter cold.[6][7]

Reproduction and genomics

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Eurygale ferox is capable of self-pollination. Pollen is released before the flower opens.[8] The majority of Euryale ferox flowers are cleistogamous, not opening for cross-pollination, though some normally-opening (chasmogamous) flowers do occur.[9]

The chromosome count is n = 29. The genome size is 870.42 Mb.[10] The chloroplast genome is 159930 bp long.[11]

Cultivation

[edit]
Further information: Mithila Makhana
Lightly roasted puffed makhana

The seeds[12] and petioles are used as food.[13] In India, more than 96,000 hectares of Bihar, where the local variety (and the nuts it produces) is called Mithila Makhana, were set aside for cultivation of Euryale in 1990–1991.[14] India is the largest global producer of Makhana (fox nut), with over 90% of cultivation concentrated in the floodplain regions of Bihar, particularly in districts like Darbhanga, Madhubani, and Purnia. Makhana has also emerged as a key agri-export commodity, valued for its nutritional profile and geographical indication.[15][4] In the northern and western parts of India, Euryale ferox seeds are often roasted or fried like popcorn.[16] In other types of cooking, they form a porridge or pudding called kheer.[7] The seeds are used in Cantonese soup,[17] in Ayurveda preparations, and in traditional Chinese medicine.[4]

Evidence from archaeobotany indicates that Euryale ferox was a frequently collected wild food source during the Neolithic period in the Yangtze region, with many finds from the sites of Kuahuqiao, Hemudu, and Tianluoshan.[18] The earliest recorded use of E. ferox is from Gesher Benot Ya'aqov, Israel, among artifacts of the Acheulean culture 750–790,000 years ago.[12]

Fox nuts have traditionally been harvested by diving without breathing equipment to a depth of 2.4 m (7 ft 10 in) in freshwater ponds. This is arduous, with skin hazards from mud and the plant's thorns. In the 21st century, the National Research Centre for Makhana has pioneered the plant's cultivation in fields flooded to a depth of 30 cm (12 in) which makes production and harvesting easier. The area of land devoted to fox nut production has increased to 35,000 ha (86,000 acres) by 2022. The centre has developed a more productive variety, increasing farm income, and is designing a harvesting machine.[19]

Taxonomy

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The species was described by Richard Anthony Salisbury in 1805. It is a member of the water lily family Nymphaeaceae.[2] It is the type species of its genus.[20] In 1811, Henry Cranke Andrews described Anneslea spinosa, now treated as a synonym of E. ferox.[21] In 1853, Jules Émile Planchon described Euryale indica, now also treated as a synonym.[22] The placement in a separate family Euryalaceae J.Agardh, which was proposed by Jacob Georg Agardh in 1858,[23][24] has been rejected.[24][25] Unlike other water lilies, the pollen grains of Euryale have three nuclei.[26]

The genus is named after a mythical Greek monster, the Gorgon Euryale.[14] The specific epithet ferox means fierce or ferocious in Latin.[27] मखाना ("Makhanā") is the Hindi name for the plant.[28]

Distribution

[edit]

Euryale ferox is a perennial plant native to a range from northern India to Taiwan and through China, Korea, and Japan to far eastern Russia.[29]

In 2022, E. ferox was recorded as naturalised in Serbia, probably dispersed from plants grown in botanical gardens by migrating birds.[30]

Conservation status

[edit]

The species is classified on the Red List of endangered plants in Japan and given the designation "vulnerable", as it is threatened both by water pollution and by land reclamation there.[9][31] It is similarly rated as vulnerable (VU) in South Korea.[32] It is classified as a species of Least Concern (LC) in the IUCN Red List of Threatened Species due to its extensive use and cultivation in China.[1] However, a global population decline has been reported.[9]

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See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Euryale ferox

View on Grokipedia
from Grokipedia
Euryale ferox is a aquatic in the family , recognized as the sole extant in its monotypic genus, characterized by large, spiny, floating leaves and vibrant purple flowers, with edible seeds widely known as fox nuts or makhana. Native to eastern , including regions from northern and to , Korea, and eastern , this plant thrives in still or slow-flowing lowland ponds and lakes, often cultivated for over 3,000 years in parts of , , and . The plant features robust stems and leaves up to 1-1.5 meters in diameter, covered in sharp prickles on both surfaces, forming expansive floating mats that can spread up to 3-5 meters wide; its hermaphroditic flowers, with inner white and outer deep violet petals, bloom during the day above the water surface in spring and summer, requiring full sun and water depths of 7-20 cm. Fruits are soft, pulpy, and orange-sized, containing 8-15 starchy, pea-sized seeds that are harvested, roasted, or popped for consumption, providing a nutrient-rich food source high in starch (around 400 kcal per 100g) and used in traditional dishes like Indian kheer. In traditional medicine, various parts of E. ferox serve as astringents and tonics; seeds address kidney issues and diarrhea, leaves aid childbirth, and the plant overall exhibits deobstruent properties, while its cultivation demands rich, submerged soils and is typically treated as an annual in temperate climates due to limited cold hardiness (down to -5°C).

Taxonomy and Nomenclature

Classification

Euryale ferox belongs to the kingdom Plantae, phylum Tracheophyta, class Magnoliopsida, order Nymphaeales, and family Nymphaeaceae, positioning it among the basal angiosperms known as water lilies. The genus Euryale is monotypic, with E. ferox as its sole extant species, distinguishing it from more speciose genera in the Nymphaeaceae such as Nymphaea and Nuphar. The species was first described by Richard Anthony Salisbury in 1805 in the Annals of Botany, based on specimens from Asian wetlands, establishing its taxonomic foundation within the . Subsequent classifications, including those in modern databases, have confirmed its placement without significant revisions, affirming its status as an accepted name in the genus . This positioning highlights its aquatic habit and floral characteristics typical of the family, such as floating leaves and emergent flowers.

Etymology and Synonyms

The genus name Euryale derives from Euryale, one of the three Gorgons in Greek mythology, chosen by the botanist Richard Anthony Salisbury in 1805. The specific epithet ferox is Latin for "fierce" or "savage," alluding to the sharp prickles on the leaves, stems, and fruits that give the plant a formidable appearance. Several synonyms have been proposed for Euryale ferox over time, reflecting early taxonomic confusion due to variable descriptions of specimens from across its range. These include Anneslea spinosa Andrews (1811), based on a prickly aquatic plant from India initially placed in a separate genus; Euryale indica Planchon (1853), described from Indian material but later recognized as conspecific; and the variety Euryale ferox f. ussuriense Regel (1861), which represented eastern Asian forms now considered part of the typical variation. The plant is known by various common names reflecting its regional uses and appearance, such as prickly waterlily and gorgon plant in English, makhana in Hindi and other Indian languages, fox nut globally for its edible seeds, and qian shi (芡實) in Chinese.

Morphology and Growth

Vegetative Structures

Euryale ferox is characterized by a short, rhizomatous stem that anchors the plant in sediment at the bottom of water bodies, typically in depths of 0.3 to 1.5 meters, though it can grow in waters up to 5 meters deep. This rhizome supports annual vegetative growth, producing a rosette of leaves that emerge and expand rapidly during the growing season. The plant's overall growth form is that of a robust aquatic perennial, with the rhizome enabling persistence across seasons while facilitating new shoot development each year. The leaves are large, round, and peltate, with a central petiole attachment on the underside, reaching diameters of up to 2.7 meters in exceptional cases, though typically 1.3 meters or less. The adaxial surface is green to olive-green, while the abaxial surface is dark purple, with prominent purplish veins radiating from the center. Petioles can extend up to 2-3 meters in length to reach the surface from deeper sediments. Both petioles and leaves are covered in dense, sharp prickles, particularly on the undersides and along veins, which serve as a physical defense against herbivores and facilitate the plant's to aquatic environments by deterring grazing. Physiological adaptations enhance the plant's survival in still or slow-moving waters. The broad, floating leaves provide through air-filled channels in the veins, allowing them to support the plant's weight and resist wave action. uptake occurs primarily through roots extending from the into the , supplemented by absorption from the surrounding , enabling efficient resource acquisition in low-oxygen, profundal zones. These features contribute to the plant's dominance in stagnant aquatic habitats.

Reproductive Structures

The flowers of Euryale ferox are solitary and epigynous, measuring approximately 5 cm in , with outer petals that are violet or purple, gradually transitioning to white inner petals that are oblong-lanceolate and progressively smaller toward the center. These flowers emerge above the water surface on stout, prickly peduncles, facilitating their reproductive function in an aquatic environment. The majority of flowers are cleistogamous, remaining closed and promoting . After , the inferior, multicarpellary develops into spiny, berry-like capsules that are spongy in texture and measure 5–10 cm in length. Each typically contains 8 to 15 seeds, though numbers can vary up to 30 or more depending on environmental conditions. These fruits are densely prickled on the exterior, aiding in protection during maturation while submerged. The seeds within the capsules are hard-coated, spherical structures, 4–6 mm in diameter, turning black upon maturity. The seeds are hard-coated and spherical; upon release from the spongy fruit, they can float on water for dispersal. The capsules dehisce by bursting irregularly, typically in late summer, to liberate the seeds into the surrounding aquatic habitat.

Habitat and Distribution

Environmental Preferences

_Euryale ferox thrives in stagnant or slow-moving freshwater environments, such as and lakes, where water depths typically range from 0.3 to 5 meters. This species prefers nutrient-rich, muddy substrates, including heavy clay soils high in (around 36 g/kg) that provide anchorage and essential nutrients for root development. Optimal growth occurs in temperatures between 20°C and 35°C, supporting active vegetative expansion and reproduction during the warm season. While intolerant to or during active growth, E. ferox exhibits winter in temperate regions, with rhizomes surviving low temperatures when dormant and resuming growth in spring. The plant requires full sun exposure for , showing poor performance in shaded conditions due to its reliance on high light intensity for expansion above the surface. Water quality is critical, with a preference for neutral to slightly alkaline levels of 6.5 to 7.9 and low water flow to avoid uprooting the anchored roots. These conditions are commonly found in native Asian wetlands, facilitating its natural distribution.

Geographic Range

_Euryale ferox is native to eastern , with its range extending from northern , including regions such as and , through and to Korea, , and the far eastern parts of , particularly the River valley up to approximately 53°N latitude. This distribution spans temperate to subtropical freshwater habitats across these areas, where the plant thrives in still or slow-moving waters. Introduced populations have been documented outside this native range, notably in , where the species was first recorded as naturalized in in 2022, likely dispersed from ornamental plants in botanical gardens via migrating birds. This establishment raises concerns about potential further spread in through the ornamental trade and waterfowl-mediated . Additional non-native occurrences include a population in , Russia, beyond the core native extent. In 2024, the species was detected in Loeb Lake, , USA, marking its first known occurrence in . Fossil records indicate a historically wider distribution during the period, with seeds documented from the in and other parts of , suggesting the genus once occupied broader Eurasian lake and swamp environments before contracting to its current range. The species' spread is limited by its low cold hardiness during the active growing season, intolerance to frost, and specificity for shallow, nutrient-rich standing waters, which restrict establishment in regions with harsh winters or unsuitable aquatic habitats. Seed dormancy, requiring specific chilling conditions for , further constrains natural expansion.

Reproduction and Genetics

Pollination and Seed Dispersal

Euryale ferox exhibits a mixed reproductive strategy, predominantly relying on cleistogamous flowers that self-pollinate within unopened buds, ensuring high rates of without external pollinators. These cleistogamous flowers undergo precocious shortly after emergence, typically from early July in natural habitats, which facilitates efficient production under aquatic conditions. While the majority of reproduction occurs via this selfing mechanism, a smaller proportion of chasmogamous flowers—up to about 22.5% in later growth stages—open briefly on the water surface, potentially allowing for . In chasmogamous flowers, is primarily self-facilitated, with occurring prior to or at ; cross-pollination by insects is rare due to the absence of documented floral visitors, brief one-day opening, and the plant's isolated floating leaves. This short emergence period minimizes entomophilous interactions, reinforcing reliance on self-mediated pollen transfer for the open flowers. Seed dispersal in Euryale ferox involves both hydrochory and zoochory, adapting to its aquatic habitat. The seeds, enclosed in a that dehisces underwater, are initially buoyant due to a mucilaginous , allowing them to float on the water surface for several days and be carried by currents before sinking. This hydrochorous phase enables passive spread across water bodies via waves and flows. Additionally, zoochory occurs through by birds, which consume the floating seeds and excrete them elsewhere, as evidenced by reduced dispersal linked to declining bird populations in shrinking wetlands. Germination of E. ferox requires warm conditions, optimally at 25 ± 2°C, to initiate after the phase. The exhibit physiological , broken by cold stratification at approximately 4°C for 1-6 months. Once stratified, the germinate submerged in shallow, still , in both light and dark conditions.

Genomic Characteristics

Euryale ferox exhibits a diploid complement with 2n = 58 , corresponding to a base haploid set of n = 29, which is characteristic of its minimal within the family. This configuration contrasts with the higher levels observed in related genera like , where numbers can reach up to 2n = 224 due to extensive polyploidization events. The small size, with a mean DNA content of approximately 0.03 pg per , contributes to the species' compact nuclear genome. The nuclear of E. ferox is estimated at 1C = 0.89 pg, equivalent to approximately 870.42 Mb, making it one of the smallest in the . Recent assemblies have reported sizes ranging from 721.2 Mb to 768.2 Mb, reflecting advancements in sequencing but also highlighting potential underestimation in earlier measurements due to repetitive elements. These genomic features suggest an evolutionary history involving genome downsizing, with evidence of a paleo-hexaploidization event around 17 million years ago that shaped subgenome structures without dominance, linking E. ferox phylogenetically to other like Victoria cruziana and Nymphaea colorata through shared adaptations in leaf development. The chloroplast genome of E. ferox is fully sequenced at 159,930 bp, comprising a large single-copy region of 89,678 bp, a small single-copy region of 22,202 bp, and two inverted repeats of 25,025 bp each. It encodes 127 genes, including 84 protein-coding genes, 35 tRNA genes, and 8 rRNA genes, with a GC content of 39.1%. Among these, key photosynthesis-related genes such as those for photosystems I and II (e.g., psa and psb gene families) and the large subunit of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) are present, supporting the plant's aquatic photosynthetic efficiency. This conserved organelle structure aligns with other Nymphaeaceae, underscoring the family's early-diverging angiosperm traits.

Ecology and Life Cycle

Ecological Interactions

Euryale ferox forms dense mats of floating leaves in shallow aquatic environments, providing essential and cover for various aquatic . These expansive leaf surfaces create sheltered microhabitats that support species, such as air-breathing catfishes commonly integrated in systems, by offering protection from predators and extreme conditions. In ecosystems, the plant's foliage also benefits amphibians and by stabilizing water surfaces and reducing wave action, fostering in native habitats. In introduced regions like , however, it can form invasive mats that displace native species (as of 2025). The plant exhibits defensive adaptations against herbivory, primarily through physical barriers. Sharp prickles covering , petioles, and stems act as a mechanical deterrent, discouraging by herbivores such as waterfowl and in its native range. Additionally, Euryale ferox produces secondary metabolites, including phenolics with properties. These traits enhance the plant's survival in competitive aquatic settings. In the , Euryale ferox maintains symbiotic associations with soil microbial communities, including that influence nutrient cycling and health. Fertilization practices in cultivation reveal shifts in these microbial populations, suggesting potential interactions with beneficial taxa that support growth in nutrient-limited sediments. Furthermore, the contributes to services through nutrient uptake, absorbing excess and from , which mitigates in ponds and shallow lakes. This capacity is evident in ecological ponds where E. ferox reduces total levels, promoting clearer and balanced aquatic dynamics.

Phenology and Development

Euryale ferox exhibits a distinct seasonal growth cycle as a native to shallow freshwater habitats in . New shoots emerge from overwintering rhizomes in spring, typically as temperatures rise above 15–20°C, initiating vegetative growth with the development of submerged and then floating leaves. These leaves expand rapidly, often reaching diameters of up to 1.5 m within weeks, allowing the plant to quickly occupy available surface area. Vegetative growth continues through , supported by nutrient uptake from the via erect, unbranched rhizomes. Flowering occurs primarily in summer, from June to August in its native range, with the majority of blooms being cleistogamous and appearing from early onward. Chasmogamous flowers, which open briefly, emerge later in the season, between mid-August and early September in some populations. The flowering period is influenced by environmental triggers such as increasing day length (photoperiod) and warm temperatures around 29–31°C, which promote bud initiation and . Self-pollination in both flower types aids rapid reproductive development, ensuring set even in isolated stands. Following , fruits develop submerged on coiled peduncles, with seeds reaching physiological maturity approximately 40 days after , typically by autumn. Each fruit contains 8–30 seeds, which are initially buoyant due to a mucilaginous before sinking to the . As temperatures decline in late autumn, above-ground structures senesce, and the plant enters , with rhizomes persisting in the anaerobic to withstand freezing conditions. This overwintering strategy enables survival through winter, supporting regrowth the following spring. Euryale ferox typically achieves full maturity, including maximum leaf size and reproductive capacity, within its first growing season, though as a perennial, individuals can persist for several years under favorable conditions. Rapid development in the initial year is key to its competitive success in seasonal wetlands, where short growing periods limit establishment time.

Cultivation and Production

Cultivation Methods

Euryale ferox is primarily propagated through , though division of its short s can also be used in controlled settings. Mature are soaked in for 24-48 hours to soften the coat, then sown by broadcasting at rates of 50-125 kg per in prepared ponds or fields during late winter or early spring. division involves carefully separating fragile from mature plants, replanting them in shallow to establish new growth, though this method is less common due to the plant's delicate structure. Cultivation requires stagnant or slow-flowing water bodies such as or shallow fields with depths of 1-2 , adapting the plant's natural preference for deep, still waters. The substrate should consist of fertile, clayey or loamy mud rich in ; freshly excavated may need initial amendment to support growth. Water levels are initially kept low (around 4-10 cm) during establishment, gradually increased to 90-120 cm as mature to prevent suffocation while maintaining constant submersion. is ideally maintained between 5.5 and 7.5, adjusted with lime if necessary to ensure optimal availability. Organic fertilization, such as farmyard manure at 3 tons per combined with , enhances without chemical inputs. Pest and weed relies on manual and traditional techniques to avoid chemical in aquatic environments. Weeds, including competing aquatic macrophytes, are removed by hand one to two times during the , often with the aid of integrated practices like stocking ponds with that naturally control vegetation. Insect pests such as grasshoppers and water bugs are deterred through physical barriers or organic applications like neem , eschewing herbicides to preserve . Harvesting occurs from late summer to winter once fruits mature and spines soften, typically involving manual collection from pond bottoms. Workers wade or dive to gather seed pods using long poles or tools, collecting them in nets or baskets; in shallower fields, s may be partially drained to facilitate access. Post-maturity seeds are selected for blunt spines, ensuring ripeness before extraction.

Commercial Production

India is the dominant global producer of Euryale ferox seeds, accounting for approximately 90% of worldwide output, with the state of serving as the primary hub and contributing 85-90% of India's production. Cultivation in India covers around 35,000 s as of , reflecting significant expansion from earlier decades. While and also cultivate the plant, their production shares remain minor compared to India's scale. Typical seed yields range from 1 to 2 tons per hectare under conventional methods, though improved varieties can achieve higher outputs. Production of E. ferox has surged since the , fueled by growing recognition as a nutrient-rich and increasing domestic and international demand. The cultivated area in expanded from about 13,000 hectares in the early to 35,000 hectares by 2022, with overall production doubling in recent years. The (GI) tag granted to in 2022 has enhanced its market value and authenticity, further driving cultivation growth. In September 2025, the National Makhana Board was launched in to enhance production, processing, and marketing, as announced in the Union Budget 2025-26. Nonetheless, challenges including climate variability—such as erratic rainfall and temperature shifts—affect yield consistency and require adaptive strategies for sustained expansion. Trade in E. ferox primarily involves popped , known as makhana, which are processed for direct consumption. Major markets are concentrated in , with exporting to countries like the , , and the . Export values have risen steadily, reaching about $30.5 million in fiscal year 2024-25, a 27% increase from the previous year, amid growing Western interest in superfoods.

Human Uses

Culinary Applications

The seeds of Euryale ferox, commonly known as fox nuts or makhana, undergo specific processing to prepare them for culinary use, primarily involving , , or to create lightweight, crunchy snacks. The traditional method heats graded seeds in a pan at 230–335°C for approximately 6 minutes with continuous stirring, causing them to expand into the puffed form recognized as makhana. at milder temperatures, such as 130°C for 10 minutes in a , yields a similar textured product suitable for snacking. These processed seeds are versatile and incorporated into porridges, soups, and sweets, providing a gluten-free base. Nutritionally, the popped seeds offer a high content of 79.8–84.87%, protein levels between 8.7% and 11.03%, and minimal fat at 0.33–0.5%, positioning them as a low-fat, gluten-free dietary staple. slightly enhances protein and concentrations while maintaining the low-fat profile. In regional cuisines, makhana features prominently in Indian kheer, a creamy simmered with , , and spices. Chinese preparations often include the seeds in herbal soups, such as those combined with and for tonifying effects. In , they appear as roasted nuts in dishes on a smaller scale. Dried E. ferox seeds retain viability for years when stored at low moisture content (around 6%) under cool conditions like −18°C, preserving their for culinary applications. Consumption of these nutrient-dense seeds supports overall through their balanced macronutrient composition.

Medicinal and Nutritional Value

_Euryale ferox seeds are a nutrient-dense food, containing high levels of carbohydrates (55-80%), proteins, , and essential minerals such as magnesium (6-60 mg/100 g) and (35.6-260 mg/100 g). They also provide vitamins, including vitamins, and are rich in antioxidants like polyphenols, with seed coats exhibiting up to 379.53 mg equivalents per gram dry weight. These components contribute to supporting due to the low caloric and high content, which promotes , and aid digestion through that regulates glucose absorption and prevents . The plant's bioactive compounds include and phenolic extracts that demonstrate significant pharmacological potential. from the seeds upregulate 4 (GLUT-4) via the PI3K/Akt pathway, aiding blood sugar control in diabetic models, while phenolic compounds enhance antioxidant enzyme activities such as (SOD), (CAT), and (GSH-Px), providing anti-inflammatory effects. Additionally, novel pentacyclic triterpenes and contribute to these protective mechanisms against . In , Euryale ferox has been utilized for centuries in to address kidney weakness, chronic , and spleen hypofunction, often prepared as a cooling tonic to balance bodily fluids. In (TCM), the seeds serve as an , reinforcing kidney function and essence, while tonifying the spleen to arrest and treating conditions like excessive (leucorrhea). Modern research validates these uses, with a 2022 review highlighting the seeds' antidiabetic properties through improved glycemic control in streptozotocin-induced diabetic rats and strong activity via scavenging (SC50: 6.8-12.9 μM). Fermented extracts have shown potential in reducing in fibroblasts by protecting against H2O2-induced damage. Additionally, the fraction of the seeds exhibits antimelanogenic effects by inhibiting cellular and synthesis (: 25.2 μg/mL).

Conservation Status

Threats and Status

Euryale ferox is classified as Least Concern on the global , based on a 2011 assessment that found no major threats across its wide distribution and stable populations in many areas. However, regional assessments indicate higher vulnerability; the species is rated Vulnerable in according to the national Red List of Threatened Plants, due to limited distribution and habitat pressures. Similarly, in , it is categorized as Vulnerable under the 2014 Korean Red List, with an estimated population of around 5,500 individuals facing ongoing declines. Primary threats to E. ferox include habitat loss from wetland drainage, land reclamation for development, and urbanization, which reduce suitable shallow-water environments across its native range from to . Water pollution, particularly in regions like and , exacerbates habitat degradation by altering and promoting competition from invasive hydrophytes. Overharvesting of seeds for food and medicinal uses has also contributed to population declines in wild habitats, especially in parts of where demand outpaces natural regeneration. Population trends show declines in native wild ranges due to these anthropogenic pressures, with significant shrinkage reported in eastern , northern , , and parts of . In contrast, populations remain stable or increasing in cultivated areas, particularly in , , where intensive farming supports commercial production without relying on wild stocks. Regionally, E. ferox receives protection in parts of India through Geographical Indication (GI) status granted to "Mithila Makhana" in 2022, which safeguards traditional cultivation practices in the Mithila region of Bihar and promotes sustainable harvesting.

Protection Measures

Euryale ferox benefits from inclusion in broader wetland conservation frameworks, particularly in regions where it naturally occurs. In India, the species is protected within Ramsar-designated wetlands such as Kabartal Wetland in Bihar, a key habitat for makhana (E. ferox) harvesting that spans 2,620 hectares and supports sustainable resource use through regulated activities. Additionally, the Geographical Indication (GI) tag awarded to Mithila Makhana in April 2022 by the Indian government safeguards the traditional cultivation and harvesting practices in Bihar's Mithila region, promoting sustainable production and preventing overexploitation of wild populations. Restoration initiatives target habitats critical for E. ferox survival. In , , organizations like have undertaken conservation efforts at Kabartal Wetland, including hydrological management to maintain water levels essential for the species' growth and to counteract and encroachment. In , a vegetation restoration project at Shengjin Lake, launched in 2017, reclaimed paddy fields for E. ferox habitat by planting the species, enhancing aquatic cover and supporting in the River floodplain. Research and monitoring efforts focus on genetic resources to support long-term viability. Genomic studies, including a chromosome-level assembly published in , have identified adaptations in E. ferox to aquatic environments, informing breeding programs for resilient varieties tolerant to stressors like fluctuating water levels. Ex-situ conservation occurs in botanic gardens, where controlled cultivation trials, such as those assessing seed production and biochemical traits under conditions, help preserve and propagate stock for reintroduction. Community-based approaches emphasize sustainable practices to reduce pressure on wild stocks. In , farmer cooperatives and producer groups, supported by the National Makhana Board established in 2025, promote eco-friendly cultivation techniques, including organic pond management and collective harvesting, which enhance livelihoods while conserving ecosystems. These initiatives involve over 200,000 farming families in adopting low-input methods that align with goals.

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