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This article is about the papaya. Not to be confused with the South American Mountain papaya or the Eastern North American "pawpaw". For other mugua see Chaenomeles speciosa or Pseudocydonia chinensis. For other uses, see Papaya (disambiguation).

Papaya
Plant and fruit, from Koehler's Medicinal-Plants (1887)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Caricaceae
Genus: Carica
Species:
C. papaya
Binomial name
Carica papaya

The papaya (/pəˈpaɪə/, US: /pəˈpɑːjə/), papaw, (/pəˈpɔː/[3]) or pawpaw (/ˈpɔːpɔː/[3])[4] is the plant species Carica papaya, one of the 21 accepted species in the genus Carica of the family Caricaceae,[5] and also the name of its fruit. It was first domesticated in Mesoamerica, within modern-day southern Mexico and Central America.[6][7] It is grown in several countries in regions with a tropical climate. In 2022, India produced 38% of the world's supply of papayas.

Etymology

The word papaya derives from Arawak via Spanish,[8] and is also the name for the plant. The name papaw or pawpaw is used alternatively for the fruit only in some regions.[6][9]

Description

The papaya is a small, sparsely branched tree, usually with a single stem growing from 5 to 10 m (16 to 33 ft) tall, with spirally arranged leaves confined to the top of the trunk. The lower trunk is conspicuously scarred where leaves and fruit were borne. The leaves are large, 50–70 cm (20–28 in) in diameter, deeply palmately lobed, with seven lobes. All plant parts contain latex in articulated laticifers.[10]

  • Seedlings
    Seedlings
  • Coiled phyllotaxy of papaya leaves
    Coiled phyllotaxy of papaya leaves
  • Leaf
    Leaf

Flowers

Papayas are dioecious. The flowers are five-parted and highly dimorphic; the male flowers have the stamens fused to the petals. There are two different types of papaya flowers. The female flowers have a superior ovary and five contorted petals loosely connected at the base.[11]: 235 

Male and female flowers are borne in the leaf axils; the male flowers are in multiflowered dichasia, and the female ones are in few-flowered dichasia.[citation needed] The pollen grains are elongated and approximately 35 microns in length.[citation needed] The flowers are sweet-scented, open at night, and are wind- or insect-pollinated.[10][12][13]

  • Papaya flower
    Papaya flower
  • Buds
    Buds
  • Female flowers
    Female flowers
  • Male flowers
    Male flowers
  • Close-up of male flowers
    Close-up of male flowers
  • Pollen grains
    Pollen grains

Fruit

The fruit is a large berry about 15–45 cm (6–17+3⁄4 in) long and 10–30 cm (4–11+3⁄4 in) in diameter.[10]: 88  It is ripe when it feels soft (as soft as a ripe avocado or softer) and its skin has attained an amber to orange hue. Along the walls of the large central cavity are attached numerous black seeds.[14]

  • Unripe fruit
    Unripe fruit
  • Mature tree with unripe fruit in Kinshasa
    Mature tree with unripe fruit in Kinshasa
  • Ripe fruit
    Ripe fruit
  • Papayas with yellow flesh
    Papayas with yellow flesh
  • Longitudinal section of fruit showing orange flesh and numerous black seeds
    Longitudinal section of fruit showing orange flesh and numerous black seeds
  • Papaya seeds
    Papaya seeds
Genomic information
NCBI genome ID513
Ploidydiploid
Genome size372 million bp
Number of chromosomes36
Year of completion2014

Chemistry

Papaya skin, pulp, and seeds contain a variety of phytochemicals, including carotenoids and polyphenols,[15] as well as benzyl isothiocyanates and benzyl glucosinates, with skin and pulp levels that increase during ripening.[16] The carotenoids, lutein and beta-carotene, are prominent in the yellow skin, while lycopene is dominant in the red flesh (table).[17] Papaya seeds also contain the cyanogenic substance prunasin.[18] The green fruit contains papain,[6] a cysteine protease enzyme used to tenderize meat (see below).

Distribution and habitat

Native to tropical America, papaya originates from southern Mexico and Central America.[6][7][10] Papaya is also considered native to southern Florida, introduced by predecessors of the Calusa no later than AD 300.[19] Spaniards introduced papaya to the Old World in the 16th century.[6] Papaya cultivation is now nearly pantropical, spanning Hawaii, Central Africa, India, and Australia.[6]

Wild populations of papaya are generally confined to naturally disturbed tropical forests.[7] Papaya is found in abundance on Everglades hammocks following major hurricanes, but is otherwise infrequent.[19] In the rain forests of southern Mexico, papaya thrives and reproduces quickly in canopy gaps while dying off in the mature closed-canopy forests.[7]

Ecology

See also: List of papaya diseases
Different birds eating papaya

Viruses

Papaya ringspot virus is a well-known virus within plants in Florida.[6] The first signs of the virus are yellowing and vein-clearing of younger leaves and mottling yellow leaves. Infected leaves may obtain blisters, roughen, or narrow, with blades sticking upwards from the middle of the leaves. The petioles and stems may develop dark green greasy streaks and, in time, become shorter. The ringspots are circular, C-shaped markings that are a darker green than the fruit. In the later stages of the virus, the markings may become gray and crusty. Viral infections impact growth and reduce the fruit's quality. One of the biggest effects that viral infections have on papaya is taste. As of 2010, the only way to protect papaya from this virus is genetic modification.[20]

The papaya mosaic virus destroys the plant until only a small tuft of leaves is left. The virus affects both the leaves of the plant and the fruit. Leaves show thin, irregular, dark-green lines around the borders and clear areas around the veins. The more severely affected leaves are irregular and linear in shape. The virus can infect the fruit at any stage of its maturity. Fruits as young as two weeks old have been spotted with dark-green ringspots about 1 inch (25 mm) in diameter. Rings on the fruit are most likely seen on either the stem end or the blossom end. In the early stages of the ringspots, the rings tend to be many closed circles, but as the disease develops, the rings increase in diameter consisting of one large ring. The difference between the ringspot and the mosaic viruses is the ripe fruit in the ringspot has a mottling of colors, and the mosaic does not.[21]

Fungi and oomycetes

The fungus anthracnose attacks papaya, especially mature fruits. The disease starts small with very few signs, such as water-soaked spots on ripening fruits. The spots become sunken, turn brown or black, and may get bigger. In some of the older spots, the fungus may produce pink spores. The fruit ends up being soft and having an off flavor because the fungus grows into the fruit.[22]

The fungus powdery mildew occurs as a superficial white presence on the leaf's surface, which is easily recognized. Tiny, light yellow spots begin on the lower surfaces of the leaf as the disease starts to make its way. The spots enlarge, and white powdery growth appears on the leaves. The infection usually appears at the upper leaf surface as white fungal growth. Powdery mildew is not as severe as other diseases.[23]

The fungus-like oomycete Phytophthora causes damping-off, root rot, stem rot, stem girdling, and fruit rot. Damping-off happens in young plants by wilting and death. The spots on established plants start as white, water-soaked lesions at the fruit and branch scars. These spots enlarge and eventually cause death. The disease's most dangerous feature is the fruit's infection, which may be toxic to consumers.[22] The roots can also be severely and rapidly infected, causing the plant to brown and wilt away, collapsing within days.

Pests

The papaya fruit fly lays its eggs inside of the fruit, possibly up to 100 or more eggs.[6] The eggs usually hatch within 12 days when they begin to feed on seeds and interior parts of the fruit. When the larvae mature, usually 16 days after being hatched, they eat their way out of the fruit, drop to the ground, and pupate in the soil to emerge within one to two weeks later as mature flies. The infected papaya turns yellow and drops to the ground after the papaya fruit fly infestation.[22]

The two-spotted spider mite is a 0.5-mm-long brown or orange-red or a green, greenish-yellow translucent oval pest. They all have needle-like piercing-sucking mouthparts and feed by piercing the plant tissue with their mouthparts, usually on the underside of the plant. The spider mites spin fine threads of webbing on the host plant, and when they remove the sap, the mesophyll tissue collapses, and a small chlorotic spot forms at the feeding sites. The leaves of the papaya fruit turn yellow, gray, or bronze. If the spider mites are not controlled, they can cause the death of the fruit.[22]

The papaya whitefly lays yellow, oval eggs that appear dusted on the undersides of the leaves. They eat papaya leaves, therefore damaging the fruit. There, the eggs developed into flies in three stages called instars. The first instar has well-developed legs and is the only mobile immature life stage. The crawlers insert their mouthparts in the lower surfaces of the leaf when they find it suitable and usually do not move again in this stage. The next instars are flattened, oval, and scale-like. In the final stage, the pupal whiteflies are more convex, with large, conspicuously red eyes.[22]

Papayas are one of the most common hosts for fruit flies like A. suspensa, which lay their eggs in overripe or spoiled papayas. The larvae of these flies then consume the fruit to gain nutrients until they can proceed into the pupal stage. This parasitism has led to extensive economic costs for nations in Central America.[24]

Cultivation

Historical accounts from 18th-century travelers and botanists suggested that papaya seeds were transported from the Caribbean to Malacca and then to India. From Malacca or the Philippines, papaya spread throughout Asia and into the South Pacific region. Credit for introducing papaya to Hawaii is often given to Francisco de Paula Marín, a Spanish explorer and horticulturist, who brought it from the Marquesas Islands in the early 1800s. Since then, papaya cultivation has expanded to all tropical countries and many subtropical regions worldwide. Today, papaya is grown extensively across the globe, owing to its adaptability to various climates and its popularity as a tropical fruit.[25]

Papaya plants grow in three sexes: male, female, and hermaphrodite. The male produces only pollen, never fruit. The female produces small, inedible fruits unless pollinated. The hermaphrodite can self-pollinate since its flowers contain both male stamens and female ovaries. Almost all commercial papaya orchards contain only hermaphrodites.[13]

Originally from southern Mexico (particularly Chiapas and Veracruz), Central America, northern South America, and southern Florida[6][19] the papaya is now cultivated in most tropical countries. In cultivation, it grows rapidly, fruiting within three years. It is, however, highly frost-sensitive, limiting its production to tropical climates. Temperatures below −2 °C (29 °F) are greatly harmful, if not fatal. In Florida, California, and Texas, growth is generally limited to the southern parts of those states. It prefers sandy, well-drained soil, as standing water can kill the plant within 24 hours.[26]

Cultivars

Two kinds of papayas are commonly grown. One has sweet, red, or orange flesh, and the other has yellow flesh; in Australia, these are called "red papaya" and "yellow papaw," respectively.[27] Either kind, picked green, is called a "green papaya."[citation needed]

The large-fruited, red-fleshed 'Maradol,' 'Sunrise,' and 'Caribbean Red' papayas often sold in U.S. markets are commonly grown in Mexico and Belize.[6][28]

In 2011, Philippine researchers reported that by hybridizing papaya with Vasconcellea quercifolia, they had developed papaya resistant to papaya ringspot virus (PRV),[29] part of a long line of attempts to transfer resistance from Vasconcellea species into papaya.[30]

Genetically engineered cultivars

Carica papaya was the first transgenic fruit tree to have its genome sequenced.[31] In response to the papaya ringspot virus outbreak in Hawaii in 1998, genetically altered papaya were approved and brought to market (including 'SunUp' and 'Rainbow' varieties.) Varieties resistant to PRV have some DNA of this virus incorporated into the plant's DNA.[32][33] As of 2010, 80% of Hawaiian papaya plants were genetically modified. The modifications were made by University of Hawaii scientists, who made the modified seeds available to farmers without charge.[34][35]

In transgenic papaya, resistance is produced by inserting the viral coat protein gene into the plant's genome. Doing so seems to cause a similar protective reaction in the plant to cross-protection, which involves using an attenuated virus to protect against a more dangerous strain. Conventional varieties of transgenic papaya has reduced resistance against heterologous (not closely related to the coat gene source) strains, forcing different localities to develop their own transgenic varieties. As of 2016, one transgenic line appears able to deal with three different heterologous strains in addition to its source.[36][30]

Papaya production – 2022
Country (millions of tonnes)
 India 5.3
 Dominican Republic 1.3
 Brazil 1.1
 Mexico 1.1
 Indonesia 1.1
World 13.8
Source: FAOSTAT of the United Nations[37]

Production

Worldwide papaya production map

In 2022, global production of papayas was 13.8 million tonnes, led by India with 38% of the world total (table). Global papaya production grew significantly over the early 21st century, mainly as a result of increased production in India and demand by the United States.[38] The United States is the largest importer of papayas worldwide.[12]

In South Africa, papaya orchards yield up to 100 tonnes of fruit per hectare.[39]

Toxicity

Papaya releases a latex fluid when not ripe, possibly causing irritation and an allergic reaction in some people. Because the enzyme papain acts as an allergen in sensitive individuals,[40] meat that has been tenderized with it may induce an allergic reaction.[6]

Culinary use

The ripe fruit of the papaya is usually eaten raw, without skin or seeds.[6] The black seeds are edible and have a sharp, spicy taste.[6] The unripe green fruit is usually cooked due to its latex content.

Both green papaya fruit and its latex are rich in papain,[6] a cysteine protease used for tenderizing meat and other proteins, as practiced currently by indigenous Americans, people of the Caribbean region, Pacific Islands, and the Philippines.[6] It is included as a component in some powdered meat tenderizers.[6] Papaya is not suitable for foods which set due to gelatin (such as jelly or aspic) because the enzymatic properties of papain prevent gelatin from setting.[41]

  • Papaya juice
    Papaya juice
  • Papaya jam from Senegal
    Papaya jam from Senegal

Nutrition

Papayas, raw
Nutritional value per 100 g (3.5 oz)
Energy179 kJ (43 kcal)
10.82 g
Sugars7.82 g
Dietary fiber1.7 g
0.26 g
0.47 g
Vitamins and minerals
VitaminsQuantity
%DV†
Vitamin A equiv.
5%
47 μg
3%
274 μg
89 μg
Thiamine (B1)
2%
0.023 mg
Riboflavin (B2)
2%
0.027 mg
Niacin (B3)
2%
0.357 mg
Pantothenic acid (B5)
4%
0.191 mg
Vitamin B6
2%
0.038 mg
Folate (B9)
10%
38 μg
Vitamin C
69%
62 mg
Vitamin E
2%
0.3 mg
Vitamin K
2%
2.6 μg
MineralsQuantity
%DV†
Calcium
2%
20 mg
Iron
1%
0.25 mg
Magnesium
5%
21 mg
Manganese
2%
0.04 mg
Phosphorus
1%
10 mg
Potassium
6%
182 mg
Sodium
0%
8 mg
Zinc
1%
0.08 mg
Other constituentsQuantity
Water88 g
Lycopene1828 µg
Full Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[42] except for potassium, which is estimated based on expert recommendation from the National Academies.[43]

Raw papaya pulp is 88% water, 11% carbohydrates, and contains negligible fat and protein (table). In a reference amount of 100 g (3.5 oz), papaya fruit provides 43 kilocalories and is a significant source of vitamin C (69% of the Daily Value, DV) and a moderate source of folate (10% DV), but otherwise has a low content of micronutrients (table).

Southeast Asia

Green papaya is used in Southeast Asian cooking, both raw and cooked. In some parts of Asia, the young leaves of the papaya are steamed and eaten like spinach.

In Myanmar, the unripe papaya are cut into slices and dipped into sour, fermented, or spicy seasonings and dips. In Myanmar and Thai recipes, the unripe papaya are cut into thinner slices to make papaya salad.[44] The reason the unripe papaya is used is because of the firmer and crunchier texture.

Papayas became a part of Filipino cuisine after being introduced to the islands via the Manila galleons.[45][46] Unripe or nearly ripe papayas (with orange flesh but still hard and green) are julienned and are commonly pickled into atchara, which is ubiquitous as a side dish to salty dishes.[47] Nearly ripe papayas can also be eaten fresh as ensaladang papaya (papaya salad) or cubed and eaten dipped in vinegar or salt. Green papaya is also a common ingredient or filling in various savory dishes such as okoy, tinola, ginataan, lumpia, and empanada, especially in the cuisines of northern Luzon.[48][49][50]

In Indonesian cuisine, the unripe green fruits and young leaves are boiled for use as part of lalab salad, while the flower buds are sautéed and stir-fried with chilies and green tomatoes as Minahasan papaya flower vegetable dish.

In Lao and Thai cuisine, unripe green papayas are used to make a type of spicy salad known in Laos as tam maak hoong and in Thailand as som tam. It is also used in Thai curries, such as kaeng som.

South America

In Brazil and Paraguay, the unripe fruits are used to make sweets or preserves.[citation needed]

Traditional medicine

In traditional medicine, papaya leaves have been believed useful as a treatment for malaria,[51] an abortifacient, a purgative, or smoked to relieve asthma.[6]

See also

References

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  2. ^ "Carica papaya L." U.S. National Plant Germplasm System. 9 May 2011. Retrieved 5 September 2017.
  3. ^ a b "Papaw". Collins Dictionary. n.d. Retrieved 25 April 2014.
  4. ^ In North America, papaw or pawpaw usually means the plant belonging to the Annonaceae family or its fruit. Ref.: Merriam-Webster's Collegiate Dictionary (2009), published in United States.
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  31. ^ Borrell (2008). "Papaya genome project bears fruit". Ugr.es. doi:10.1038/news.2008.772.
  32. ^ "Genetically Altered Papayas Save the Harvest". mhhe.com.
  33. ^ "Hawaiipapaya.com". Hawaiipapaya.com. Archived from the original on 2015-01-07. Retrieved 2013-06-15.
  34. ^ Ronald, Pamela and McWilliams, James (14 May 2010) Genetically Engineered Distortions The New York Times, accessed 1 October 2012
  35. ^ "TF5" (PDF). Archived from the original (PDF) on March 31, 2012.
  36. ^ Mishra R, Gaur RK, Patil BL (2016). "Current Knowledge of Viruses Infecting Papaya and Their Transgenic Management". Plant Viruses: Evolution and Management. pp. 189–203. doi:10.1007/978-981-10-1406-2_11. ISBN 978-981-10-1405-5.
  37. ^ "Papaya production in 2022; Crops/Regions/World list/Production Quantity/Year (pick lists)". UN Food and Agriculture Organization, Corporate Statistical Database (FAOSTAT). 2024. Retrieved 4 March 2024.
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  39. ^ Botha L (16 March 2021). "Growing papayas: Easy to produce, tricky to market". Farmer's Weekly. Retrieved 11 March 2023.
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  42. ^ United States Food and Drug Administration (2024). "Daily Value on the Nutrition and Supplement Facts Labels". FDA. Archived from the original on 2024-03-27. Retrieved 2024-03-28.
  43. ^ National Academies of Sciences, Engineering, and Medicine, Health and Medicine Division, Food and Nutrition Board, et al. (2019). "Chapter 4: Potassium: Dietary Reference Intakes for Adequacy". In Oria M, Harrison M, Stallings VA (eds.). Dietary Reference Intakes for Sodium and Potassium. The National Academies Collection: Reports funded by National Institutes of Health. Washington, DC: National Academies Press (US). pp. 120–121. doi:10.17226/25353. ISBN 978-0-309-48834-1. PMID 30844154. Retrieved 2024-12-05.
  44. ^ "Burmese Papaya Salad (Myanmar Food)". YouTube.
  45. ^ Alonso N (15 September 2009). "First Taste Of Mexican Cuisine". PhilStar Global. Retrieved 15 December 2018.
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  51. ^ Titanji, V.P., Zofou, D., Ngemenya, M.N. (2008). "The Antimalarial Potential of Medicinal Plants Used for the Treatment of Malaria in Cameroonian Folk Medicine". African Journal of Traditional, Complementary and Alternative Medicines. 5 (3): 302–321. PMC 2816552. PMID 20161952.
Wikimedia Commons has media related to:
Carica papaya (category)
  • The dictionary definition of papaw at Wiktionary
  • Papaya at the Wikibooks Cookbook subproject
  • "Papaya". California Rare Fruit Growers, Inc. 1997.
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