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08-SEPTEMBER-2008 09:13:22 - Walnut For other uses, see Walnut disambiguation. Walnut Tree redirects here. For other uses, see Walnut Tree disambiguation. Walnuts Persian Walnut, Juglans regia Persian Walnut, Juglans regia Scientific classification Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Fagales Family: Juglandaceae Genus: Juglans L. Species See text Walnut, English Nutritional value per 100 g 3.5 oz Energy 660 kcal 2740 kJ Carbohydrates 13.71 g - Sugars 2.61 g - Dietary fiber 6.7 g Fat 65.21 g Protein 15.23g Thiamin Vit. B1 0.341 mg 26% Riboflavin Vit. B2 0.150 mg 10% Niacin Vit. B3 1.125 mg 8% Pantothenic acid B5 0.570 mg 11% Vitamin B6 0.537 mg 41% Folate Vit. B9 98 μg 25% Vitamin C 1.3 mg 2% Calcium 98 mg 10% Iron 2.91 mg 23% Magnesium 158 mg 43% Phosphorus 346 mg 49% Potassium 441 mg 9% Zinc 3.09 mg 31% Manganese 3.414 mg Selenium 4.9 mg Percentages are relative to US recommendations for adults. Source: USDA Nutrient database Walnuts genus Juglans are plants in the family Juglandaceae. They are deciduous trees, 10 - 40 meters tall about 30-130 ft., with pinnate leaves 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 World from southeast Europe east to Japan, and more widely in the New World from southeast Canada west to California and 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 Welsh and Vlach; see Walha and History of the term Vlach.1 The walnut was so called because it was introduced from Gaul and Italy. The previous Latin name for the walnut was nux Gallica, Gallic nut.1 Contents 1 Species and classification 2 Cultivation and uses 2.1 Nuts 2.2 Wood 2.3 Shells 2.4 Parkland and garden trees 2.5 Walnut as food plants 3 Health aspects of walnuts 3.1 Walnut extract and Alzheimer's 3.2 Walnuts in Chinese medicine 4 Notes 5 References 6 See also 7 External links Species and classification Sect. Juglans. Leaves large 20-45 cm with 5-9 broad leaflets, hairless , margins entire. Wood hard. Southeast Europe to 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 - Argentine Walnut Juglans brasiliensis Dode - Brazilian Walnut Juglans californica S.Wats. - California Walnut 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 - Arizona Walnut Juglans major var. glabrata Manning Juglans microcarpa Berlandier J. rupestris Engelm. - Texas Walnut or Little Walnut Juglans microcarpa var. stewartii Johnston Manning Juglans mollis Engelm. - Mexican Walnut Juglans neotropica Diels J. honorei Dode - Andean Walnut Juglans nigra L. - Black Walnut Juglans olanchana Standl. L.O.Williams - Juglans peruviana Dode - Peruvian Walnut Juglans soratensis Manning - Juglans steyermarkii Manning - Guatemalan Walnut Juglans venezuelensis Manning - Venezuela Walnut 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. - Japanese Walnut Juglans cinerea L. - Butternut Juglans mandshurica Maxim. J. cathayensis Dode, J. formosana Hayata, J. hopeiensis Dode, J. stenocarpa Maxim. - Manchurian Walnut or Chinese Walnut. Japanese Walnut foliage and nuts Japanese Walnut foliage and nuts The best-known member of the genus is the Persian Walnut Juglans regia, native from the Balkans in southeast Europe, southwest central Asia to the Himalaya and 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 Kyrgyzstan alone 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. The 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. The Japanese Walnut Juglans ailantifolia is similar to Butternut, distinguished by the larger leaves up to 90 cm long, and round not oval nuts. Hybrids 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 Cultivation and uses Walnut output in 2005 Walnut output in 2005 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. Nuts Inside of a Persian Walnut nut with green outer layer visible in the top left corner Inside of a Persian Walnut nut with green outer layer visible in the top left corner 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 paint often 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. Persian Walnuts Persian Walnuts 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 Nocino and Nocello are 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 Diwali. Walnut husks are often used to create a rich yellow-brown to dark brown dye that 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. Wood Walnut shoot cut longitudinally to show chambered pith. Scale in mm. Walnut shoot cut longitudinally to show chambered pith. Scale in mm. 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. Veneer sliced 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 Enfield rifle 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. The Walnut Council is the key body linking growers with scientists. In Europe, various EU-led scientific programs have studied walnut growing for timber.2 Shells 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. The shells of walnuts. The shells of walnuts. 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. 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 allelopathic compound juglone, though a number of gardeners do grow them.3 4 However, different walnut species vary in the amount of juglone they release from the roots and fallen leaves - the black walnut in particular is known for its toxicity. 5 Juglone is toxic to plants such as tomato, apple, and birch and 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 Lepidoptera species. These includecitation needed: Brown-tail Euproctis chrysorrhoea 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 Juglans regia walnuts. Juglans regia walnuts. A 2006 study published in the Journal of the American College of Cardiology found 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.67 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.8 Walnut extract and Alzheimer's A 2004 study by the NYS Institute for Basic Research in Developmental Disabilities OMRDD found that walnut extract was able to inhibit and defibrillize break down fibrillar amyloid beta protein - 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 beta protein fibrillization by Thioflavin T fluorescence spectroscopy and electron microscopy.9 Similarly, in a study done at Baldwin-Wallace College in Berea, Ohio it 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.10 These results suggest that walnuts may reduce the risk or delay the onset of Alzheimer's disease by maintaining amyloid-β protein in the soluble form and prevent the breakdown of acetylcholine.9 Walnuts in Chinese medicine In 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 constipation if it is caused by dehydration.11 Notes ^ a b Online Etymology Dictionary - Walnut ^ BBC Radio 4 - Open Country - Oxfordshire ^ Ross 1996 ^ West Virginia University Extension Service - Black Walnut Toxicity ^ Rood 2001; Pomogaybin et al 2002 ^ Cortés et al 2006 ^ BBC NEWS: Health - Walnuts 'combat unhealthy fats' ^ Jelodar G, Mohsen M, Shahram S 2007. Effect of Walnut leaf, coriander and pomegranate on blood glucose and histopathology of pancreas of alloxan induced diabetic rats. African Journal of Traditional, Complimentary and Alternative Medicines 4 3: 299-305. Retrieved on 2008-05-10. ^ a b Chauhan et al 2004 ^ Society for Neuroscience 2007 ^ Acupuncture.Com - Walnuts References 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 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 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 Ð?екоторые ОÑ?обенноÑ?ти ХимичеÑ?кого СоÑ?тава И БиологичеÑ?кой Ð?ктивноÑ?ти ЛиÑ?тового Опада Видов Рода Орех Juglans L. При Интродукции Ð’ Среднем Поволжье, ХимиÑ? РаÑ?тительного СырьÑ?, 4, p. 43-47 - in Russian Rood, T. 2001 Walnut and It's Toxicity Explored, Cornell Cooperative Extension, Cornell University webpage, accessed 20 April 2008 Ross, M. 1996 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 20 April 2008 Society for Neuroscience 2007. Diet of walnuts, blueberries improve cognition; may help maintain brain function, ScienceDaily, 7 November 2007 See also Hickory Pecan External links Wikimedia Commons has media related to: Juglans Wikispecies has information related to: Juglans Informations about history, processing and health Uses of the walnut shell Flora of Bolivia: Juglans Flora of China: Juglans Flora Europaea: Juglans Flora of North America: Juglans Flora of Pakistan: Juglans Trees of the Andes: Juglans Retrieved from http://en..org/wiki/Walnut Categories: Juglandaceae | Edible nuts and seedsHidden categories: All articles with statements | Articles with statements since October 2007 Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Asturianu БългарÑ?ки Dansk Deutsch Ελληνικά Español Esperanto Ù?ارسی Français Galego Hrvatski Italiano Latina LatvieÅ¡u Magyar മലയാളം Nederlands 日本語 ‪Norsk bokmÃ¥l‬ ‪Norsk nynorsk‬ Polski Português РуÑ?Ñ?кий Shqip СрпÑ?ки / Srpski Suomi SlovenÅ¡Ä?ina Svenska ไทย Türkçe УкраїнÑ?ька ä¸æ–‡ This page was last modified on 22 August 2008, at 23:58
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