|Exterior and cross-sectional interior of gac|
Gấc (botanical name: Momordica cochinchinensis) is a type of perennial melon grown throughout Southeast Asian countries and Northeastern Australia. Gấc is notable for its orange-reddish color resulting from its rich content of beta-carotene and lycopene.
As gấc was originally discovered in Vietnam, it is commonly called by its Vietnamese name (gấc, pronounced [ɣək˦˥]). The fruit may also be called "quả gấc" as "quả" means "fruit" in Vietnamese, and has various common names.
In the eighteenth century, the Portuguese priest, J. Lourciso, visited Vietnam and discovered the plant. He gave it the name Muricia cochinchinensis in the book Flora Cochinchinesis published in 1790. Later, Sprengel found that the plant belonged to the Linnean genus Momordica and changed its name in 1826.
Gấc grows as dioecious vines, meaning its male and female flowers are on separate plants, producing flowers typically 5–10 centimetres (2.0–3.9 in) in length. Its vines can extend to 20 metres (66 ft) long, and its flowers blooms once a year, single or in bundle, around two to three months after the vines are planted. In one season, a plant can produce from 30 to 60 fruits. Approximately five months after flowering, the ripe bright-red fruits can be harvested, usually over September to December annually.
Typically, gấc fruits are round or oblong, about 13 centimetres (5.1 in) in length and 10 centimetres (3.9 in) in diameter, covered with small spines on the exocarp. Upon ripening, gấc gradually changes colors, from green to yellow, orange and finally red when it can be harvested. At this time, the fruit is hard, but turns soft quickly, creating a challenge for storage and transportation.
Gấc fruit has a mild taste and dense flesh (mesocarp). The inside of a gấc fruit comprises two parts: fruit (yellow) and seed membrane (red color). Larger fruits have a higher percentage of edible aril than smaller fruits.
Breeding and cultivation
As gac plant is dioecious, both male and female plants are needed; hence, farmers must have at least one corresponding male plant growing in or around the gardens for the fruit-bearing female plants to be pollinated. In order to breed, gac can change sex, and may change from one season to the next. When grown from seed, the ratio of male to female plants is unpredictable.
Pollination may be facilitated by insects, but hand pollination allows for better fruit yield. New plants can also be generated from root tubers as a more reliable method to yield fruits, because germination by seeds can be difficult due to several environmental factors such as dormancy or plant age. An alternative method is to graft female material onto the main shoot of a male plant.
For maximum insect-aided pollination, the recommended ratio is about 1 male for every 10 female plants. If propagating from vines, farmers make diagonal cut (around 15–20 centimetres (5.9–7.9 in) long and 3–6 millimetres (0.12–0.24 in) wide), then root the tubers in water or well-aerated, moist potting media before planting.
Gac has been commonly used in its native countries, mainly as food and traditional medicine. Its use as medicine has been dated back to over 1200 years ago in China and Vietnam Gac seeds, known as mù biē zǐ (meaning 'wooden turtle seed'), are used for a variety of internal and topical purposes in traditional medicine.
The aril surrounding gac seeds when the fruits are ripe is cooked with sticky rice to make “Xôi Gấc”, a traditional Vietnamese dish in red color served at weddings and New Year celebrations. In addition, the immature green fruit is also used as a vegetable in India. The spiny skin is removed and the fruits are sliced and cooked sometimes with potato or bottle gourd. In Sri Lanka, gac is used in curry, and in Thailand, gac is served with ice cream.
Gac fruit, seeds, and seed oil contain substantial amounts of beta-carotene and lycopene which collectively impart the characteristic red-orange color to the fruit's tissues. Both aril and seeds are rich in monounsaturated and polyunsaturated fatty acids, with oil containing 69% unsaturated fats, including 35% as polyunsaturated fats. Gac has a high concentration of linoleic acid (omega-6) and omega-3 fatty acids.
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- Media related to Momordica cochinchinensis at Wikimedia Commons