Chayote
Chayote (Sechium edule), also known as mirliton or vegetable pear, is a perennial herbaceous climbing vine in the Cucurbitaceae family, characterized by its tuberous roots, slender stems with tendrils, heart-shaped leaves, and monoecious flowers that produce pear-shaped, fleshy fruits with a single large seed.[1] Native to Mesoamerica, particularly southern Mexico and Guatemala, it has been cultivated for thousands of years, with possible domestication by Otomanguean peoples around the 12th century BCE and evidence of cultivation by the Maya dating to the 8th century CE.[1] The plant thrives in tropical and subtropical climates, growing up to 15 meters (50 feet) long on supports, and is propagated vegetatively by planting the whole fruit, which sprouts from the seed embedded within. Introduced to Europe in the 18th century and subsequently to Africa, Asia, and other regions through Spanish and Portuguese colonization, chayote is now widely grown as a food crop in countries like Mexico, Costa Rica, India, and parts of the United States, including Florida and California.[2] Cultivation requires well-drained, fertile soil with a pH of 6.0–7.0 and full sun, yielding fruits 4–6 months after planting, with each vine potentially producing 50–100 fruits per season under optimal conditions.[2] The fruit, which varies in color from pale green to dark green or even white, is harvested when firm and is versatile in preparation, often eaten raw in salads, boiled, stir-fried, or stuffed in various cuisines.[3] Nutritionally, chayote is low in calories at 19 kcal per 100 grams of raw fruit and provides significant amounts of dietary fiber (1.7 g), vitamin C (7.7 mg, or 9% of the daily value), folate (93 µg, or 23% DV), and potassium (125 mg, or 3% DV), along with smaller quantities of protein (0.82 g), carbohydrates (4.51 g), and minerals like calcium and magnesium.[4] All parts of the plant are edible, including tender shoots used in teas or soups and starchy tubers harvested as a root vegetable, contributing to its value in traditional diets and potential health benefits such as antioxidant and anti-inflammatory effects from its bioactive compounds.[1]History and Origin
Domestication in Mesoamerica
The chayote (Sechium edule), a perennial vine in the Cucurbitaceae family, originated in southern Mexico and Guatemala, regions that exhibit the highest genetic diversity among its wild and cultivated forms, establishing these areas as primary centers of domestication. This concentration of variation, analyzed through isozyme and molecular markers, supports the hypothesis that indigenous peoples in Mesoamerica selectively bred the plant from wild ancestors over millennia. Early cultivation likely began among Otomanguean-speaking groups in southern Mexico as far back as the 12th century BCE, predating the rise of major civilizations in the region. Archaeological records provide concrete evidence of chayote's integration into Mesoamerican societies, with remains indicating cultivation in Copan, Honduras, between 700 and 900 CE, reflecting its adoption in Mayan agricultural systems. Further support comes from Mayan contexts dating to the 8th century CE, where the plant appears in settlement records as a managed crop. Linguistic evidence reinforces pre-Columbian origins, as the name "chayote" derives from the Nahuatl term chayotli, used by Aztec and related Nahua peoples to denote the fruit, underscoring its deep-rooted domestication as a key vegetable long before European contact. In ancient Mesoamerican agriculture, chayote functioned as a staple crop for Aztec, Mayan, and other indigenous groups, valued for its versatile yields of edible fruits and nutrient-rich tubers that contributed significantly to daily sustenance. These parts were harvested year-round, providing a reliable food source in diverse agroecosystems, from highland terraces to lowland plots, and facilitated local exchange networks among communities.Global Spread and Introduction
Following its domestication in Mesoamerica, chayote (Sechium edule) was introduced to the Old World by Spanish explorers during the 16th century as part of the Columbian Exchange.[5] The plant reached the Philippines via the Manila galleon trade route between Acapulco and Manila, which began in 1565 and facilitated the transport of American crops to Asia; by the late 16th century, chayote had established in the region and subsequently spread to other parts of Asia and Africa through colonial networks.[5][1] In the 18th century, chayote was introduced to Europe, where it was initially cultivated as an ornamental plant in countries such as France and England, often in greenhouses or botanical gardens due to its attractive vines and fruits.[1] During this period, it also expanded across the wider Americas through European colonial activities, including migrations from the Caribbean to regions like Louisiana and Texas.[5] By the 20th century, commercialization took hold in California, where cultivation had begun in the previous century but grew into significant production on large farms until competition from imports in the 1980s.[5] Similarly, in Australia, chayote became established in subtropical coastal areas during the early 20th century, supporting limited commercial growth.[5] The rapid global dissemination of chayote was enabled by its ease of vegetative propagation using whole fruits, which remain viable for months during transport and readily sprout in suitable conditions.[2] Additionally, its adaptability to subtropical and tropical climates, tolerating a wide range of altitudes and soils, allowed it to thrive in diverse new environments without requiring extensive modification.[5][2]Nomenclature and Taxonomy
Etymology and Common Names
The term "chayote" originates from the Nahuatl word chayotli, which refers to a spiny, edible squash, reflecting the plant's prickly exterior in its native Mesoamerican context.[6] This indigenous name entered Spanish as chayote through early colonial interactions in Mexico, where the plant was a staple crop among Aztec and other Mesoamerican peoples.[7] The first scientific description of the plant appeared in Patrick Browne's 1756 Civil and Natural History of Jamaica, where he documented its cultivation in the Caribbean and proposed the genus name Sechium, though he referred to it locally as "chocho" rather than "chayote."[8] As chayote spread globally via European colonization, its nomenclature evolved, incorporating indigenous terms alongside adaptations in colonial languages. In the French Caribbean, it is commonly called "christophine," a name possibly honoring Saint Christopher and tied to French colonial trade routes.[9] In Jamaica and parts of South America, "chocho" persists as a vernacular name derived from local dialects influenced by Spanish and African linguistic exchanges during the colonial era.[10] The Philippines knows it as "sayote," a phonetic adaptation introduced by Spanish colonizers in the 16th century, blending Nahuatl roots with Tagalog pronunciation.[11] These names represent just a fraction of numerous variations documented worldwide, including "mirliton" in Louisiana Creole, "choko" in Australia and New Zealand, and "vegetable pear" in English-speaking regions, each illustrating how colonial expansion and cultural exchanges reshaped indigenous terminology to fit new linguistic and culinary contexts.[12] This proliferation underscores the plant's adaptability and the role of trade networks in disseminating both the crop and its multifaceted identities.Botanical Classification and Varieties
Chayote, scientifically known as Sechium edule (Jacq.) Sw., belongs to the Cucurbitaceae family, a diverse group that includes cucumbers, squash, and melons. The genus Sechium was historically regarded as monotypic, with S. edule as its sole species, reflecting its long cultivation history without known wild progenitors until recent decades.[9] Taxonomic revisions since the 1970s have expanded the genus to include up to 11 species, based on morphological and anatomical analyses that distinguish wild forms from the cultivated S. edule.[13] These updates highlight Sechium's Neotropical origins and its close relation to other cucurbit genera like Sicyos.[14] The cultivated chayote exhibits significant varietal diversity, with at least 25 recognized landraces in Central America alone, though global cultivation has led to numerous local selections exceeding 100 cultivars when accounting for regional adaptations.[9] Key distinctions include spiny-skinned varieties, such as S. edule var. nigrum spinosum, which feature prickly exteriors for natural pest deterrence, and smooth-skinned types like the widely grown "Virens levis," prized for easier handling and milder flavor.[14] These variations arise from selective breeding focused on fruit color (ranging from pale green to dark or yellowish-white), size, and shape, primarily in tropical and subtropical regions.[14] Wild relatives underscore Sechium's Mesoamerican center of diversity, with species like S. hintonii—endemic to central and southern Mexico and once thought extinct—and S. chinantlense from Oaxaca providing genetic insights into chayote's ancestry.[15] Genetic studies using markers such as RAPD, ISSR, and isozymes across accessions from Mexico, Costa Rica, and India confirm high diversity in southern Mexico, supporting a single domestication event around the 12th century BCE by indigenous groups like the Otomangueans.[14] Recent 2021 omics research, including a high-quality genome assembly of 606.42 Mb across 14 chromosomes, further validates this single origin by revealing low genetic variation in cultivated lines compared to wild relatives, with 28,237 predicted genes aiding breeding efforts.[14]Botanical Description
Plant Morphology
Chayote (Sechium edule) is a perennial herbaceous climbing vine belonging to the Cucurbitaceae family, characterized by its vigorous growth habit and need for structural support such as trellises or fences.[9] The plant typically reaches lengths of 10 to 15 meters, with slender, scandent stems that are flexuous, slightly compressed, and longitudinally furrowed, giving them a rough, wrinkled appearance.[16] These stems bear nodes from which branched tendrils—often divided into three to five parts—emerge to facilitate climbing, while alternate leaves and vegetative branches arise from the same points.[17] The leaves are large, alternate, and palmately lobed, ranging from heart-shaped to suborbicular with three to eight angular lobes and minutely denticulate or slightly serrated margins; they measure approximately 10 to 20 cm in length and width.[1] The root system consists of a single thick primary root that produces adventitious tuberous roots, which serve as storage organs rich in starch and enable the plant's perennial nature.[16] In tropical and subtropical regions, chayote exhibits true perennial growth, with continuous above-ground development year-round under optimal conditions.[1] However, in temperate areas, the plant is highly sensitive to frost, leading to annual above-ground dieback during cold periods, though the tuberous roots allow regrowth in spring if protected from severe freezes.[2] The vine produces small, white flowers in a monoecious arrangement, though these are secondary to its vegetative dominance.[9]Fruit and Reproductive Structures
The fruit of chayote (Sechium edule) is an indehiscent pepo, typically pear-shaped and furrowed, with dimensions ranging from 7 to 20 cm in length and 5 to 8 cm in width, and weighing 0.25 to 1 kg depending on the variety.[9] The outer skin, or epicarp, varies in color from pale green to dark green or even white in certain cultivars, and its texture can be smooth or adorned with soft, blunt spines.[1] Beneath the skin lies crisp, white flesh forming the mesocarp and endocarp, which encases a single large, flattened seed measuring 3 to 5 cm long.[9] This seed is endocarpic and recalcitrant, characterized by a soft, smooth testa and two cotyledons, and it often exhibits vivipary, germinating within the fruit soon after maturity due to sensitivity to desiccation and loss of viability when extracted.[18][19] Chayote reproduces both sexually and vegetatively, though vegetative propagation predominates in cultivation owing to challenges with seed handling.[14] The plant is monoecious, bearing clusters of male flowers with five stamens on racemes and solitary female flowers, both featuring small, white, rotate corollas and nectar-producing hypanthia that attract generalist insect pollinators such as bees.[1][20] Following insect-mediated pollination, the inferior ovary of the female flower develops into the single-seeded fruit, which is self-compatible but often cross-pollinated in natural settings.[20] Sexual reproduction yields fruits with low seed viability outside the maternal tissue, as the viviparous nature leads to precocious germination without a dormancy period or need for stratification, limiting traditional seed-based breeding.[14][19] Vegetative reproduction occurs primarily by planting the entire sprouted fruit, which leverages the viviparous seedling to establish new vines rapidly.[9] Fruit development proceeds from pollination through a sigmoid growth pattern, comprising an initial lag phase of slow expansion and high transpiration (0-9 days after anthesis), a rapid exponential growth phase with endosperm and cotyledon accumulation (9-18 days after anthesis), and a final maturation phase marked by reduced growth, increased soluble sugars, and partial seed development (18-21 days after anthesis or longer in some varieties).[18] Harvest typically occurs 30 to 60 days after pollination, when fruits reach full size and the skin toughens, though full physiological maturity may extend to 1-2 months in subtropical conditions.[2][21] These fruits are borne singly on the vigorous climbing vines that support the plant's perennial growth.[1] Additionally, after the first year, the plant forms tuberous roots as secondary storage organs, storing carbohydrates and aiding survival during adverse periods.[1]Cultivation
Environmental Requirements
Chayote (Sechium edule), a perennial vine native to tropical and subtropical regions, thrives in warm climates with optimal daytime temperatures ranging from 19°C to 30°C (66°F to 86°F) and nighttime temperatures above 15°C (59°F).[2][22] The plant is highly frost-sensitive, with exposure below 12°C (54°F) damaging unripe fruits and potentially killing the vine, limiting its cultivation to frost-free areas or protected environments in temperate zones.[2] It requires high relative humidity of 80% to 85% for vigorous growth and prefers evenly distributed annual rainfall of 1500 to 2000 mm (60 to 80 inches), though it tolerates 600 to 2600 mm (24 to 100 inches) with supplemental irrigation during dry periods to maintain soil moisture without waterlogging.[9][2] Well-drained, fertile loamy soils, such as sandy loams enriched with organic matter, are ideal for chayote, supporting root development and nutrient uptake while preventing root rot.[23][22] The crop performs best at a soil pH of 5.5 to 7.0 but can tolerate a broader range of 4.3 to 8.0, including slightly acidic to alkaline conditions; however, it shows reduced productivity in heavy clay or calcareous soils high in calcium and magnesium.[2][23] While chayote demonstrates resilience to poorer soils in its native Mesoamerican ranges, it cannot endure waterlogged conditions, necessitating raised beds or mounds in areas with heavy rainfall or poor drainage.[9] Cultivation succeeds from sea level up to elevations of approximately 1800 meters (6000 feet) in suitable tropical highlands.[2][22] Chayote requires full sun exposure for optimal fruit production and color, though it tolerates partial shade, which may result in darker green fruits.[22][23] As a vigorous climbing perennial vine, it benefits from trellises or supports at least 1.8 meters (6 feet) tall, with plants spaced 2 to 3 meters (7 to 11 feet) apart to allow for sprawling growth and adequate air circulation.[22] A day length of about 12 hours is necessary to induce flowering and fruit set.[2][22]Propagation and Growing Practices
Chayote is primarily propagated vegetatively by planting whole, sprouted fruits directly into the soil, with the crown (broader) end oriented upward to facilitate emergence of the shoot.[24] This method ensures true-to-type reproduction since the plant is typically seedless, and sprouting the fruit indoors for 2-4 weeks prior to planting improves establishment by promoting root development.[25] Fruits are planted in early spring in temperate regions or at the start of the rainy season in tropical areas, spaced 3-4 meters apart along trellises to support the vigorous climbing vines, which can reach 10-15 meters in length.[2] Alternative propagation techniques include using stem cuttings from young basal shoots, treated with rooting hormones like indole-3-butyric acid for better establishment, or planting pieces of the edible root tubers in suitable conditions.[26] These methods are less common in home gardens but useful in commercial settings for maintaining specific varieties or rapid scaling. In commercial agriculture, chayote is often grown using organic practices, such as applying manure-based fertilizers and mulching to enhance soil fertility, and intercropping with shade-tolerant crops like beans or under fruit trees to optimize land use and reduce erosion.[2] Optimal yields range from 20-50 fruits per vine after the first year, with commercial plantations achieving 10-20 tons per hectare under well-managed conditions requiring full sun, well-drained soils with pH 6.0-7.0, and consistent irrigation.[5][9] Plants typically begin fruiting 3-5 months after planting, with vines producing continuously for several months in suitable climates. Harvesting occurs when fruits are immature (4-6 inches long, about 35 days after pollination) for tender texture in fresh dishes, or allowed to mature fully for longer storage potential.[9][2] Post-harvest, fruits should be handled carefully to avoid mechanical damage and stored at 7-10°C with 85-90% humidity to prevent chilling injury, which manifests as pitting and browning below 10°C; wrapping in perforated plastic or waxed paper helps maintain quality for up to 4 weeks.[9][2]Pests, Diseases, and Management
Chayote cultivation faces significant challenges from various insect pests and fungal diseases, particularly in tropical and subtropical regions where high humidity promotes pathogen proliferation. Major pests include aphids (Aphis spp.), which suck sap from leaves and stems, causing distortion and dark blemishes on fruits, thereby reducing plant vigor and yield.[2] Cucumber beetles (Diabrotica spp.) and related scarab beetles (Phyllophaga spp.) feed on seedlings and fruits, transmitting bacterial wilt and creating entry points for secondary infections.[2] Squash vine borers (Melittia cucurbitae) and similar lepidopteran borers, such as the melonworm (Diaphania hyalinata), bore into stems and unripe fruits, leading to wilting and fruit drop, with the climbing vine habit of chayote exacerbating spread along trellises.[26][2] Fungal diseases are among the most destructive, with powdery mildew (Podosphaera xanthii) forming white powdery growth on leaves and stems, impairing photosynthesis and favoring humid conditions.[27] Anthracnose, caused by Colletotrichum spp. (such as Colletotrichum orbiculare), produces sunken lesions on leaves, stems, and fruits, persisting through rainy seasons and causing substantial defoliation.[2][28] Ascochyta phaseolorum causes a related fruit spot disease with whitish sunken spots. Root rot from Fusarium oxysporum attacks the root system, leading to stunted growth and plant collapse, especially in waterlogged soils during high rainfall.[2] These biotic stresses can result in yield losses of 35–40% in humid areas without intervention, with higher impacts up to 50% reported in severely affected tropical regions.[2][29] Effective management relies on integrated pest management (IPM) approaches, combining cultural, biological, and chemical strategies to minimize environmental impact. Crop rotation with non-host plants, such as cereals or legumes, disrupts pest and pathogen life cycles, reducing soil-borne issues like Fusarium root rot.[2] Planting resistant varieties, where available through breeding programs, helps combat aphids and borers, while manual removal of infested plant parts limits borer and disease spread.[1] Organic fungicides, including copper-based compounds, provide control for powdery mildew and anthracnose, applied preventatively during humid periods.[2] Recent research in 2025 has highlighted biocontrol agents like low-molecular-weight chitosan, which inhibits Phytophthora spp. and induces systemic resistance in chayote, offering a sustainable alternative to synthetic pesticides for managing root rot diseases.[30] In introduced regions like Florida, vigilant monitoring addresses potential quarantine concerns from invasive pests such as nematodes, ensuring compliance with local regulations to prevent broader outbreaks.[2]Nutritional Profile and Health Benefits
Nutritional Composition
Chayote fruit, raw, consists primarily of water, making up approximately 94% of its composition per 100 grams, which contributes to its low caloric density of 19 kcal. The macronutrient profile includes 0.82 grams of protein, 0.13 grams of total fat, and 4.51 grams of carbohydrates, of which 1.7 grams are dietary fiber and 1.66 grams are sugars. Among micronutrients, it provides notable amounts of vitamin C at 7.7 milligrams, folate at 93 micrograms, and potassium at 125 milligrams per 100 grams, alongside smaller quantities of other vitamins and minerals such as vitamin B6 (0.076 mg) and manganese (0.189 mg).| Nutrient | Amount per 100 g (raw fruit) | % Daily Value* |
|---|---|---|
| Water | 94.07 g | — |
| Energy | 19 kcal | 1% |
| Protein | 0.82 g | 2% |
| Total Fat | 0.13 g | 0% |
| Carbohydrates | 4.51 g | 2% |
| Dietary Fiber | 1.7 g | 6% |
| Vitamin C | 7.7 mg | 9% |
| Folate (B9) | 93 µg | 23% |
| Potassium | 125 mg | 3% |