Jojoba

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Jojoba
Jojoba1343.JPG
A wild jojoba bush
Scientific classification
Kingdom: Plantae
(unranked): Eudicots
(unranked): Core eudicots
Order: Caryophyllales
Family: Simmondsiaceae
van Tieghem ex Reveal & Hoogland
Genus: Simmondsia
Species: S. chinensis
Binomial name
Simmondsia chinensis
(Link) C. K. Schneid.
Synonyms[1]
  • Buxus chinensis Link

Jojoba Listeni/həˈhbə/ (Simmondsia chinensis) (also known as goat nut, deer nut, pignut, wild hazel, quinine nut, coffeeberry, and gray box bush)[2] is a native shrub of the Sonoran,[3] Mojave and Baja California deserts of Arizona, California, and Mexico as well as the southernmost portion of the California Floristic Province. It is the sole species of the family Simmondsiaceae, placed in the order Caryophyllales. Jojoba is grown commercially for its oil, a liquid wax ester, extracted from its seed. The plant has also been used to combat and prevent desertification in the Thar Desert in India.

Description[edit]

Jojoba typically grows to 1–2 meters (3.3–6.6 ft) tall, with a broad, dense crown, but there have been reports of plants as tall as 3 meters (9.8 ft).[4] The leaves are opposite, oval in shape, 2–4 centimeters (0.79–1.57 in) long and 1.5–3 centimeters (0.59–1.18 in) broad, thick, waxy, and glaucous gray-green in color. The flowers are small and greenish-yellow, with 5–6 sepals and no petals.

Jojoba foliage provides year-round food for many animals, including deer, javelina, bighorn sheep, and livestock. Its nuts are eaten by squirrels, rabbits, other rodents, and larger birds. Only Bailey's pocket mouse, however, is known to be able to digest the wax found inside the jojoba nut.

In large quantities, jojoba seed meal is toxic to many mammals, and the indigestible wax acts as a laxative in humans. The Seri, who utilize nearly every edible plant in their territory, do not regard the beans as real food and in the past ate it only in emergencies.[2]

Despite its scientific name Simmondsia chinensis, jojoba does not originate in China; the botanist Johann Link, originally named the species Buxus chinensis after misreading a collection label "Calif", referring to California, as "China."

Native Americans discovered the importance and versatility of jojoba. During the early eighteenth century, Jesuit missionaries in Baja observed them heating jojoba seeds to soften them. They then used pestle and mortar to create a salve or buttery substance. The latter was applied to the skin and hair to heal and condition. Native Americans also used the salve to soften and preserve animal hides. Pregnant women ate jojoba seeds, believing they assisted during childbirth. Hunters and raiders munched jojoba on the trail to keep hunger at bay.

Jojoba was collected again in 1836 by Thomas Nuttall who described it as a new genus and species in 1844, naming it Simmondsia californica, but priority rules require that the original specific epithet be used. The common name should also not be confused with the similar-sounding jujube (Ziziphus zizyphus), an unrelated plant.[citation needed]

Reproduction[edit]

Each plant is dioecious, with hermaphrodites being extremely rare. The fruit is an acorn-shaped ovoid, three-angled capsule 1–2 centimeters (0.39–0.79 in) long, partly enclosed at the base by the sepals. The mature seed is a hard oval that is dark brown and contains an oil (liquid wax) content of approximately 54%. An average-sized bush produces 1 kilogram (2.2 lb) of pollen, to which few humans are allergic.[2] The female plants produce seed from flowers pollinated by the male plants. Jojoba leaves have an aerodynamic shape, creating a spiral effect, which brings wind-born pollen from the male flower to the female flower. In the Northern Hemisphere, pollination occurs during February and March. In the Southern Hemisphere, pollination occurs during August and September. The haploid number of jojoba is 13. Somatic cells of jojoba are tetraploid, the number of chromosomes is 2n = 4x = 52.[5]

Origin[edit]

Jojoba is endemic to North America and occupies an area of approximately 260,000 square kilometers (100,000 sq mi) between latitudes 25° and 31° North and between longitudes 109° and 117° West, which is approximately the area covered by the Sonoran Desert.[3]

Etymology[edit]

The name "jojoba" originated from O'odham Hohowi. The O'odham people, from the Sonoran Desert in the southwestern United States, treated burns with an antioxidant salve made from a paste of the jojoba nut.[2]

Cultivation and uses[edit]

Jojoba (Simmondsia chinensis) oil in a clear glass vial
Wild jojoba seed market on the San Carlos Apache Indian Reservation in Arizona

Jojoba is grown for the liquid wax (commonly called jojoba oil) in its seeds.[6] This oil is rare in that it is an extremely long (C36–C46) straight-chain wax ester and not a triglyceride, making jojoba and its derivative jojoba esters more similar to human sebum and whale oil than to traditional vegetable oils.

Jojoba oil is interesting for the industry because it is odorless and it has a viscosity which is temperature-independent. Applications vary from engine lubricating oil to cooking oil. Jojoba wax is used predominantly for pharmaceutical compounds, specially for skin products. After polymerization, factice can be used for rubber production. Its use as biodiesel fuel is becoming more and more important.[7]

Jojoba has also been discussed as a possible source of biofuel. Jojoba oil consists of long straight monoesters of 22 to 44 carbon atoms (as opposed to most vegetable oils which consist of triglycerides), which makes it comparable to diesel in terms of energy density.[8][9] The pretreatment of jojoba oil for the use of biofuel is simpler compared to that of other mineral and bio-oils and it is expected that combustion of jojoba oil leads to smaller NOx-emissions compared to diesel and does not lead to any SOx emissions.[8]

Light, coarse textured soils are preferred by jojoba. Good drainage and water penetration is necessary. It tolerates salinity and poor-nutrient soils. Soil pH should be between 5 and 8.[10] High temperatures are tolerated by jojoba, but frost can damage or kill plants.[11] Requirements are poor because jojoba plants do not need an intensive cultivation. Weed problems only occur during the first two years after planting and there is little damage by insects. Supplemental irrigation could maximize production if rainfall as less than 400 mm.[10] There is no need for high fertilisation, but, especially in the first year, nitrogen increases growth.[12] Jojoba is normally harvested by hand because seeds do not all mature in the same time. Yield is around 3.5 t/ha depending on the age of the plantation.[10]

Plantations of jojoba have been established in a number of desert and semi-desert areas, predominantly in Argentina, Australia, Israel, Mexico, Peru and the United States. It is currently the Sonoran Desert's second most economically valuable native plant (overshadowed only by the Washingtonia palms used in horticulture).

Selective breeding is developing plants that produce more beans with higher wax content, as well as other characteristics that will facilitate harvesting.[2]

Its ability to withstand high salinity (up to 12 dS m−1 at pH 9) and the high value of jojoba products make jojoba an interesting plant for the use of desertification control, for example in India.[13]

References[edit]

  1. ^ Tropicos
  2. ^ a b c d e Steven J. Phillips, Patricia Wentworth Comus (eds.) (2000). A Natural History of the Sonoran Desert. University of California Press. pp. 256–257. ISBN 0-520-21980-5. 
  3. ^ a b Gentry, Howard Scott (July 1958). "The natural history of Jojoba (Simmondsia chinensis) and its cultural aspects". Economic Botany 12 (3): 261–295. doi:10.1007/BF02859772. 
  4. ^ Gentry, Howard Scott (July 1958). "The natural history of Jojoba (Simmondsia chinensis) and its cultural aspects". Economic Botany 12 (3): 261–295. doi:10.1007/BF02859772. 
  5. ^ Tobe, Hiroshi; Yasuda, Sachiko; Oginuma, Kazuo (December 1992). "Seed coat anatomy, karyomorphology, and relationships ofSimmondsia (Simmondsiaceae)". The Botanical Magazine Tokyo 105 (4): 529–538. doi:10.1007/BF02489427. 
  6. ^ IENICA "Jojoba" Retrieved on 2011-02-16.
  7. ^ Lieberei, N.(1979). Nutzpflanzen, UTB, Stuttgard, 1979, p 399
  8. ^ a b Al-Hamamre, Z. (July 2013). "Jojoba is a Possible Alternative Green Fuel for Jordan". Energy Sources, Part B: Economics, Planning, and Policy 8 (3): 217–226. doi:10.1080/15567240903330442. 
  9. ^ Al-Widyan, Mohamad I.; Al-Muhtaseb, Mu’taz A. (August 2010). "Experimental investigation of jojoba as a renewable energy source". Energy Conversion and Management 51 (8): 1702–1707. doi:10.1016/j.enconman.2009.11.043. 
  10. ^ a b c Yermanos, D. M.(1979). Jojoba – a crop whose time has come, California Agriculture
  11. ^ Borlaug, N.(1985), Jojoba. New Crop for Arid Lands, New Raw Material for Industry, National Academy Press
  12. ^ Nelson, M.(2001), Nitrogen fertilization effects on jojoba seed production, Industrial Crops and Products, 13, 2001, p 145-154
  13. ^ Abdulrahman S . Alsharhan , Abdulrahman Fowler , Andrew S . Goudie , Eissa M Abdellatif , and Warren W . Wood (2003). Desertification in the third millennium. Lisse: Balkema. pp. 151–172. ISBN 978-0-415-88943-8. 

External links[edit]