name = Walnuts
image_width = 250px
Persian Walnut, "Juglans regia"
genus = "Juglans"
genus_authority = L.
subdivision_ranks = Species
subdivision = See textnutritionalvalue
Walnuts (genus "Juglans") are
plants in the family Juglandaceae. They are deciduous trees, 10 - 40 meters tall (about 30-130 ft.), with pinnateleaves 200 - 900 millimetres long (about 7-35 inches), with 5 - 25 leaflets; the shoots have chambered pith, a character shared with the wingnuts ("Pterocarya") but not the hickories ("Carya") in the same family.
The 21 species in the genus range across the north temperate
Old Worldfrom southeast Europeeast to Japan, and more widely in the New Worldfrom southeast Canadawest to Californiaand south to Argentina. The Latin name ,"Juglans", derives from ,"Jovis glans", "Jupiter's acorn": figuratively, a nut fit for a god.
The word "walnut" derives from Old English "wealhhnutu", literally "foreign nut", "wealh" meaning "foreign" ("wealh" is akin to the terms and
Vlach; see *" Walha" and History of the term Vlach). [http://www.etymonline.com/index.php?search=walnut&searchmode=none Online Etymology Dictionary - "Walnut"] ] The walnut was so called because it was introduced from Gauland Italy. The previous Latinname for the walnut was "nux Gallica", "Gallic nut".
pecies and classification
*Sect. "Juglans". Leaves large (20-45 cm) with 5-9 broad leaflets, hairless , margins entire. Wood hard. Southeast
Europeto central Asia.
**"Juglans regia" L. ("J. duclouxiana" Dode, "J. fallax" Dode, "J. orientis" Dode) -
Persian Walnut, Carpathian, or Common Walnut
**"Juglans sigillata" Dode -
Iron Walnut(doubtfully distinct from "J. regia")
*Sect. "Rhysocaryon". Leaves large (20-50 cm) with 11-23 slender leaflets, finely pubescent, margins serrated. Wood hard.
North America, South America.
**"Juglans australis" Griseb. ("J. boliviana" Dode) -
**"Juglans brasiliensis" Dode -
**"Juglans californica" S.Wats. -
**"Juglans hindsii" (Jepson) R.E.Smith - Hinds' Walnut
**"Juglans hirsuta" Manning -
Nuevo Leon Walnut
**"Juglans jamaicensis" C.DC. ("J. insularis" Griseb.) -
West Indies Walnut
**"Juglans major" (Torrey) Heller ("J. arizonica" Dode, "J. elaeopyron" Dode, "J. torreyi" Dode) -
***"Juglans major" var. "glabrata" Manning
**"Juglans microcarpa" Berlandier ("J. rupestris" Engelm.) -
Texas Walnutor Little Walnut
***"Juglans microcarpa" var. "stewartii" (Johnston) Manning
**"Juglans mollis" Engelm. -
**"Juglans neotropica" Diels ("J. honorei" Dode) -
**"Juglans nigra" L. -
**"Juglans olanchana" Standl. & L.O.Williams -
**"Juglans peruviana" Dode -
**"Juglans soratensis" Manning -
**"Juglans steyermarkii" Manning -
**"Juglans venezuelensis" Manning -
*Sect. "Cardiocaryon". Leaves very large (40-90 cm) with 11-19 broad leaflets, softly downy, margins serrated. Wood soft. Northeast
Asia, eastern North America.
**"Juglans ailantifolia" Carr. ("J. cordiformis" Maxim., "J. sieboldiana" Maxim.) -
**"Juglans cinerea" L. - Butternut
Juglans mandshurica" Maxim. ("J. cathayensis" Dode, "J. formosana" Hayata, "J. hopeiensis" Dode, "J. stenocarpa" Maxim.) - Manchurian Walnut or Chinese Walnut.
The best-known member of the genus is the
Persian Walnut("Juglans regia"), native from the Balkansin southeast Europe, southwest & central Asiato the Himalayaand southwest China.
The scientific name Juglans is from the Latin "jovis glans", "Jupiter's acorn", and "regia", "royal". Its common name, Persian walnut, indicates its origins in Persia (Iran) in southwest Asia; 'walnut' derives from the Germanic wal- for "foreign", recognising that it is not a nut native to northern Europe. According to the UN Food and Agriculture Organization (FAO), Shahmirzad orchard in Iran is the largest in the world (700-750 ha). In
Kyrgyzstanalone there are 230,700 ha of walnut-fruit forest, where "J. regia" is the dominant overstorey (Hemery and Popov 1998). This is the species which is widely cultivated for its delicious nuts. "J. regia" is also called English walnut because English merchant marines once controlled its world commerce.
Black Walnut("Juglans nigra") is a common species in its native eastern North America, and is also widely cultivated elsewhere. The nuts are edible, but have a smaller kernel and an extremely tough shell, and they are not widely grown for nut production.
The Butternut ("Juglans cinerea") is also native to eastern North America, where it is currently endangered by an introduced disease,
butternut canker, caused by the fungus"Sirococcus clavigignenti". Its leaves are 40-60 cm long, and the nuts oval.
Japanese Walnut("Juglans ailantifolia") is similar to Butternut, distinguished by the larger leaves up to 90 cm long, and round (not oval) nuts.
*"Juglans x bixbyi" Rehd. - "J. ailantifolia" x "J. cinerea"
*"Juglans x intermedia" Carr. - "J. nigra" x "J. regia"
*"Juglans x notha" Rehd. - "J. ailantifolia" x "J. regia"
*"Juglans x quadrangulata" (Carr.) Rehd. - "J. cinerea" x "J. regia"
*"Juglans x sinensis" (D. C.) Rehd. - "J. mandschurica" x "J. regia"
*"Juglans x paradox" Burbank - "J. hindsii" x "J. regia"
*"Juglans x royal" Burbank - "J. hindsii" x "J. nigra"
Some fruits are borderline and difficult to categorize. Hickory nuts (Carya) and Walnuts (Juglans) in the
Juglandaceaefamily grow within an outer husk; these fruits are technically drupes or drupaceous nuts, and thus not true botanical nuts. "Tryma" is a specialized term for such nut-like drupes. [http://waynesword.palomar.edu/fruitid1.htm Identification Of Major Fruit Types] [http://waynesword.palomar.edu/ecoph8.htm Fruits Called Nuts]
Cultivation and uses
The two most commercially important species are "J. regia" for timber and nuts, and "J. nigra" for timber. Both species have similar cultivation requirements and are widely grown in temperate zones.
Walnuts are light-demanding species that benefit from protection from wind. Walnuts are also very hardy against drought.
Interplanting walnut plantations with a nitrogen fixing plant such as "Elaeagnus × ebbingei" or "E. umbellata", and various "Alnus" species results in a 30% increase in tree height and girth (Hemery 2001).
When grown for nuts care must be taken to select
cultivars that are compatible for pollination purposes, although some cultivars are marketed as "self fertile" they will generally fruit better with a different pollination partner. There are many different cultivars available for growers, offering different growth habit, flowering and leafing, kernel flavour and shell thickness. A key trait for more northerly latitudes of N. America and Europe is phenology, with ‘late flushing’ being particularly important to avoid frost damage in Spring. Some cultivars have been developed for novel ‘hedge’ production systems developed in Europe and would not suit more traditional orchard systems.
The nuts of all the species are edible, but the walnuts commonly available in shops are from the Persian Walnut, the only species which has a large nut and thin shell. A horticultural form selected for thin nut shells and hardiness in temperate zones is sometimes known as the 'Carpathian' walnut. The nuts are rich in oil, and are widely eaten both fresh and in
cookery. Walnut oil is expensive and consequently is used sparingly; most often in salad dressing. Walnuts are also an excellent source of omega-3 fatty acids, and have been shown as helpful in lowering cholesterol. They need to be kept dry and refrigerated to store well; in warm conditions they become rancid in a few weeks, particularly after shelling. Oil paintoften employs walnut oil as an effective binding medium, known for its clear, glossy consistency and non-toxicity. Flour made from walnut shells is widely used in the plastics industry.
Two-thirds of the world export market [http://www.fas.usda.gov/htp/Hort_Circular/2004/12-10-04/12-04%20Walnuts.pdf] [http://www.walnuts.org/walnuts101/history_cultivation_processing.php] and 99% of the US commercial production is grown in California's Central Valley and in Coastal Valleys, from Redding in the north to Bakersfield in the south. [http://www.walnuts.org/walnuts101/faq.php] Over 30 varieties are grown there, but Chandler and Hartley account for over half of total production. [http://www.walnuts.org/walnuts101/history_cultivation_processing.php]
In California commercial production, the black walnut is used mainly as a rootstock for English walnuts, because black walnuts are more work to crack and remove from the shell. One ounce of English walnuts has 18.5 grams of total fat and 2.6 grams of omega 3’s. One ounce of black walnut has 16.7 grams of total fat and .57 grams of omega 3’s. [http://www.walnuts.org/walnuts101/faq.php#menu9] In some countries immature nuts in their husks are preserved in vinegar. In England these are called "pickled walnuts" and this is one of the major uses for fresh nuts from the small scale plantings. In
Armenian cuisine, walnuts are preserved in sugar syrup and eaten whole. In Italy, liqueurs called Nocinoand Nocelloare flavoured with walnuts. In Georgia, walnuts are ground along with other ingredients to make walnut sauce.
Walnuts are heavily used in India. In Jammu, India it is used widely as a "prasad" (offering) to Mother Goddess Vaisnav Devi and, generally, as a dry food in the season of festivals such as
Walnut husks are often used to create a rich yellow-brown to dark brown
dyethat is used for dyeing fabric and for other purposes. When picking walnuts, the husks should be handled wearing rubber gloves, to avoid dyeing one's fingers.
The Persian Walnut, and the Black Walnut and its allies, are important for their attractive timber, which is hard, dense, tight-grained and polishes to a very smooth finish. The colour ranges from creamy white in the sapwood to a dark chocolate colour in the heartwood. When kiln-dried, walnut wood tends toward a dull brown colour, but when air-dried can become a rich purplish-brown. Because of its colour, hardness and grain it is a prized furniture and carving wood. Walnut
burls (or 'burrs' in Europe) are commonly used to create bowls and other turned pieces. Veneersliced from walnut burl is one of the most valuable and highly prized by cabinet makers and prestige car manufacturers. Walnut wood has been the timber of choice for gun makers for centuries, including the Lee Enfieldrifle of the First World War. It remains one the most popular choices for rifle and shotgun stocks, and is generally considered to be the premium – as well as the most traditional – wood for gun stocks. Walnut is also used in lutherie, i.e. making guitar bodies. The wood of the Butternut and related Asian species is of much lower value, softer, coarser, less strong and heavy, and paler in colour.
In North America research has been undertaken mostly on "Juglans nigra" aiming to improve the quality of planting stock and markets. In some areas of the US black walnut is the most valuable commercial timber species. [http://ohioline.osu.edu/b700/b700_22.html] [http://www.walnutcouncil.org The Walnut Council] is the key body linking growers with scientists. In Europe, various EU-led scientific programs have studied walnut growing for timber. [ [http://www.bbc.co.uk/radio4/factual/opencountry_20020330.shtml BBC Radio 4 - Open Country - Oxfordshire] ]
The walnut shell has a wide variety of uses. It is commonly used as an organic abrasive, to polish and clean a number of different materials. Black walnut shell is the hardest of the walnut shells, and therefore has the highest resistance to break-down. It is environmentally friendly and can be recycled.
* Cleansing and polishing: Walnut shells are mostly used to clean soft metals, fiberglass, plastics, wood and stone. Uses include cleaning automobile and jet engines, electronic circuit boards, and paint and graffiti removal. This soft grit abrasive is well suited for air blasting, de-burring, de-scaling, and polishing operations because of its elasticity and resilience. For example: In the early days of jet transportation, crushed walnut shells were used to scour the compressor airfoils clean, but when engines with air cooled vanes and blades in the turbine started being manufactured this practice was stopped. The problem being that the crushed shells tended to plug up the cooling passages to the turbine, resulting in turbine failures due to overheating.
* Oil well drilling: The shell is used widely in oil well drilling for lost circulation material in making and maintaining seals in fracture zones and unconsolidated formations.
* Paint thickener: Walnut shells are added to paint to give it a thicker consistency for "plaster effect" ranges.
* Explosives: Used as a filler in dynamite.
* Cosmetic cleaner: Occasionally used in soap and exfoliating cleansers.
Parkland and garden trees
Walnuts are very attractive trees in
parks and large gardens. Walnut trees are easily propagated from the nuts. Seedlings grow rapidly on good soils. [http://ohioline.osu.edu/b700/b700_22.html] The Japanese Walnut in particular is grown for its huge leaves, which have a 'tropical' appearance.
As garden trees they have some drawbacks, in particular the falling nuts, and the releasing of the
allelopathiccompound juglone, though a number of gardeners do grow them. [Ross (1996)] [ [http://www.wvu.edu/~agexten/hortcult/fruits/blkwalnt.htm West Virginia University Extension Service - "Black Walnut Toxicity"] ] However, different walnut species vary in the amount of juglone they release from the roots and fallen leaves - the black walnutin particular is known for its toxicity. [Rood (2001); Pomogaybin "et al" (2002)] Juglone is toxic to plants such as tomato, apple, and birchand may cause stunting and death of nearby vegetation. Juglone appears to be one of the walnut's primary defence mechanisms against potential competitors for resources (water, nutrients and sunlight), and its effects are felt most strongly inside the tree's "drip line" (the circle around the tree marked by the horizontal distance of its outermost branches). However, even plants at a seemingly great distance outside the drip line can be affected, and juglone can linger in the soil for several years even after a walnut is removed as its roots slowly decompose and release juglone into the soil.
Walnut as food plants
Walnuts are used as food plants by the
larvae of some Lepidopteraspecies. These includeFact|date=October 2007:
* the "
Coleophora" case-bearers "C. laticornella" (recorded on "J. nigra") and "C. pruniella".
Common Emerald("Hemithea aestivaria")
* Emperor Moth ("Pavonia pavonia")
* The Engrailed ("Ectropis crepuscularia")
Walnut Sphinx("Amorpha juglandis")
In addition, walnuts are a popular snack among woodland creatures, specifically mice and squirrels.
Health aspects of walnuts
A 2006 study published in the Journal of the
American College of Cardiologyfound that eating walnuts after a meal high in unhealthy fats can reduce the damaging effects of such fats on blood vessels. Researchers from Barcelona's Hospital Clinic conducted a study on 24 adult participants, half of whom had normal cholesterol levels, and half of whom had moderately high levels of cholesterol. Each group was fed two high-fat meals of salami and cheese, eaten one week apart. During one meal, the researchers supplemented the food with five teaspoons of olive oil. The researcher added eight shelled walnuts to the other meal, the following week.
Tests after each meal showed that both the olive oil and the walnuts helped reduce the onset of dangerous inflammation and oxidation in the arteries after the meals, which were high in saturated fat. However, unlike the olive oil, the walnuts also helped the arteries maintain their elasticity and flexibility, even in the participants with higher cholesterol.
Lead researcher Dr. Emilio Ros said walnuts' protective effects could be because the nuts are high in antioxidants and ALA, a plant-based
omega-3 fatty acid. Walnuts also contain arginine, which is an amino acid that the body uses to produce nitric oxide, necessary for keeping blood vessels flexible. [Cortés "et al" (2006)] [ [http://news.bbc.co.uk/1/hi/health/6036409.stm BBC NEWS: Health - "Walnuts 'combat unhealthy fats' "] ]
The latest scientific development has revealed that the plant leaves have the function of reducing fasting blood sugar (FBS) in diabetic rats, of which beta cells could be regenerated, indicating the promising future of the plant for medicinal use. [cite journal |author=Jelodar G, Mohsen M, Shahram S |title=Effect of Walnut leaf, coriander and pomegranate on blood glucose and histopathology of pancreas of alloxan induced diabetic rats |journal=African Journal of Traditional, Complimentary and Alternative Medicines |year=2007 |volume=4 |issue=3 |pages=299–305 |url=http://www.bioline.org.br/request?tc07044 |accessdate=2008-05-10]
Walnut extract and Alzheimer's
A 2004 study by the [http://www.omr.state.ny.us/ws/ws_ibr_resources.jsp NYS Institute for Basic Research in Developmental Disabilities] (
OMRDD) found that walnut extract was able to inhibit and defibrillize (break down) fibrillar amyloid betaprotein - the principal component of amyloid plaques in the brains of patients with Alzheimer's. The study looked at the effect of walnut extract on amyloid betaprotein fibrillization by Thioflavin T fluorescence spectroscopyand electron microscopy.Chauhan "et al" (2004)] Similarly, in a study done at Baldwin-Wallace Collegein Berea, Ohioit was found that two of its major components in walnuts, gallic and ellagic acid, act as "dual-inhibitors" of the enzyme acetylcholinesterase which, in association with amyloid-β, inhibits protein aggregation, and will also inhibit the site of acetylcholinesterase responsible for the breakdown of acetylcholine. [Society for Neuroscience (2007)]
These results suggest that walnuts may reduce the risk or delay the onset of
Alzheimer's diseaseby maintaining amyloid-β protein in the soluble form and prevent the breakdown of acetylcholine.
Walnuts in Chinese medicine
Traditional Chinese Medicine, walnut seeds are primarily considered a kidney tonic. They are also considered beneficial to the brain, back, and skin, and to relieve constipationif it is caused by dehydration. [ [http://www.acupuncture.com/nutrition/walnuts1.htm Acupuncture.Com - "Walnuts"] ]
* Brinkman, K.A. (1974) "Juglans" L. - Walnut", in: Schopmeyer, C.S. (ed.), "Seeds of woody plants in the United States", Agriculture Handbook 450, Washington, DC : U.S. Department of Agriculture, Forest Service, p. 454–459, (rev. ed.: 1992), ISBN 0-931146-21-6
* Chauhan, N., Wang, K.C., Wegiel, J. and Malik, M.N. (2004) [http://www.ingentaconnect.com/content/ben/car/2004/00000001/00000003/art00006 "Walnut Extract Inhibits the Fibrillization of Amyloid Beta-Protein, and also Defibrillizes its Preformed Fibrils] ", "Current Alzheimer Research", 1 (3), p. 183–188
* Cortés, B., Núñez, I., Cofán, M., Gilabert, R., Pérez-Heras, A., Casals, E., Deulofeu, R. and Ros, E. (2006) [http://content.onlinejacc.org/cgi/content/full/48/8/1666 "Acute Effects of High-Fat Meals Enriched With Walnuts or Olive Oil on Postprandial Endothelial Function"] , "J. Am. Coll. Cardiol.", 48 (October), p. 1666–1671, doi|10.1016/j.jacc.2006.06.057
* Hemery, G.E. (2001) "Growing walnut in mixed stands", "Quart. J. Forestry", 95, p. 31–36
* Hemery, G.E. and Popov, S.I. (1998) "The walnut ("Juglans regia" L.) forests of Kyrgyzstan and their importance as a genetic resource", "Commonwealth Forestry Review", 77 (4), p. 272–276
* Pomogaybin, A.V., Kavelenova, L.M. and Silayeva, O.N. (2002) [http://www3.asu.ru/science/journal/chemwood/volume6/2002_04/0204_043.pdf "Некоторые Особенности Химического Состава И Биологической Активности Листового Опада Видов Рода Орех ("Juglans" L.) При Интродукции В Среднем Поволжье] ", "Химия Растительного Сырья", 4, p. 43–47 - in Russian
* Rood, T. (2001) " [http://counties.cce.cornell.edu/yates/mg%20articles/MG4.25.01.htm Walnut and It's Toxicity Explored] ", Cornell Cooperative Extension, Cornell University webpage, accessed
* Ross, M. (1996) " [http://findarticles.com/p/articles/mi_m1082/is_n4_v40/ai_18629649 Walnuts: a mixed blessing - can have an adverse effect on some plants: includes a listing of plants unaffected by chemicals from the walnut tree - Gardening Challenges - Cover Story] ", "Flower & Garden Magazine", (August-Sept), BNET UK website, accessed
* Society for Neuroscience (2007). " [http://www.sciencedaily.com/releases/2007/11/071106122843.htm Diet of walnuts, blueberries improve cognition; may help maintain brain function] ", "ScienceDaily",
* [http://www.walnuts.org/walnuts101/index.php Informations about history, processing and health]
* [http://www.sfp.forprod.vt.edu/factsheets/walnut.pdf Uses of the walnut shell]
* [http://www.walnutcouncil.org/pruning.htm Pruning]
* [http://www.efloras.org/florataxon.aspx?flora_id=40&taxon_id=116860 Flora of Bolivia: "Juglans"]
* [http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=116860 Flora of China: "Juglans"]
* [http://rbg-web2.rbge.org.uk/cgi-bin/nph-readbtree.pl/feout?FAMILY_XREF=&GENUS_XREF=Juglans&SPECIES_XREF=&TAXON_NAME_XREF=&RANK= Flora Europaea: "Juglans"]
* [http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=116860 Flora of North America: "Juglans"]
* [http://www.efloras.org/florataxon.aspx?flora_id=5&taxon_id=116860 Flora of Pakistan: "Juglans"]
* [http://www.efloras.org/florataxon.aspx?flora_id=201&taxon_id=116860 Trees of the Andes: "Juglans"]
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walnut — [wôl′nut΄, wôl′nət] n. [ME walnot < OE walhhnutu < wealh, foreign (see WELSH) + hnutu, NUT] 1. any of a genus (Juglans) of trees of the walnut family, valued as shade trees, for their nuts, and for their wood, used in making furniture,… … English World dictionary
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