راوند

الراوند
Rhubarb
Rheum rhabarbarum.2006-04-27.uellue.jpg
التصنيف العلمي
مملكة:
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Order:
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Species:
R. rhabarbarum
Binomial name
Rheum rhabarbarum

الراوند Rhubarb هو مجموعة من النباتات التي تنتمي إلى جنس Rheum في الفصيلة البطباطية Polygonaceae.[1] The plant is a herbaceous perennial that grows from short, thick rhizomes. Historically, different plants have been called "rhubarb" in English. The large, triangular leaves contain high levels of oxalic acid and anthrone glycosides, making them inedible. The small flowers are grouped in large compound leafy greenish-white to rose-red inflorescences.

The precise origin of culinary rhubarb is unknown. The species Rheum rhabarbarum (syn. R. undulatum) and R. rhaponticum were grown in Europe before the 18th century and used for medicinal purposes. By the early 18th century, these two species and a possible hybrid of unknown origin, R. × hybridum, were grown as vegetable crops in England and Scandinavia. They readily hybridize, and culinary rhubarb was developed by selecting open-pollinated seed, so its precise origin is almost impossible to determine.[2] In appearance, samples of culinary rhubarb vary on a continuum between R. rhaponticum and R. rhabarbarum. However, modern rhubarb cultivars are tetraploids with 2n = 44, in contrast to 2n = 22 for the wild species.[3]

Although rhubarb is a vegetable, it is often put to the same culinary uses as fruits.[4] The leaf stalks can be used raw, when they have a crisp texture (similar to celery, although it is in a different family), but are most commonly cooked with sugar and used in pies, crumbles and other desserts. They have a strong, tart taste. Many cultivars have been developed for human consumption, most of which are recognised as Rheum × hybridum by the Royal Horticultural Society.[5]

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الوصف النباتي

الراوند نبات معمر، وتوجد منه عدة أنواع أهمها: راوند الراحى، والراوند الهندي، والراوند الصيني. أوراقه راحية كبيرة الحجم وحافتها مسننة أو متماوجة، وعنق الورقة شحمي، الأزهار وحيدة الجنس في سنابل كثيفة لونها أبيض مشرب بالأخضر.


الزراعة

Young rhubarb flowers

Rhubarb is grown widely, and with greenhouse production it is available throughout much of the year. It needs rainfall and an annual cold period of up to 7–9 weeks at 3 °C (37 °F), known as 'cold units', to grow well. The plant develops a substantial underground storage organ (rhubarb crowns) and this can be used for early production by transferring field-grown crowns to warm conditions.[6] Rhubarb grown in hothouses (heated greenhouses) is called "hothouse rhubarb", and is typically made available at consumer markets in early spring, before outdoor cultivated rhubarb is available. Hothouse rhubarb is usually brighter red, tenderer and sweeter-tasting than outdoor rhubarb.[7] After forcing for commercial production, the crowns are usually discarded.[6] In temperate climates, rhubarb is one of the first food plants harvested, usually in mid- to late spring (April or May in the Northern Hemisphere, October or November in the Southern Hemisphere), and the season for field-grown plants lasts until the end of summer.

In the United Kingdom, the first rhubarb of the year is harvested by candlelight in forcing sheds where all other light is excluded, a practice that produces a sweeter, more tender stalk.[8] These sheds are dotted around the "Rhubarb Triangle" in Yorkshire between Wakefield, Leeds, and Morley.[9]

In the United States rhubarb is primarily produced in the states of Oregon, Washington, and Wisconsin with approximately 1,200 acres in production, of which 175 are covered in hothouses.[10] In the northwestern US states of Oregon and Washington, there are typically two harvests, from late April to May and from late June into July;[11] half of all US commercial production is in Pierce County, Washington.[12] Rhubarb is ready to consume as soon as harvested, and freshly cut stalks are firm and glossy.

Rhubarb damaged by severe cold should not be eaten, as it may be high in oxalic acid, which migrates from the leaves and can cause illness.[13]

The colour of rhubarb stalks can vary from the commonly associated crimson red, through speckled light pink, to simply light green. Rhubarb stalks are poetically described as "crimson stalks". The colour results from the presence of anthocyanins, and varies according to both rhubarb variety and production technique. The colour is not related to its suitability for cooking.[14]

زراعة الراوند تاريخياً

حزمة راوند

The Chinese call rhubarb "the great yellow" (dà huáng 大黃), and have used rhubarb root for medicinal purposes.[15] It appears in The Divine Farmer's Herb-Root Classic, which is thought to have been compiled about 1,800 years ago.[16] Though Dioscurides' description of ρηον or ρά indicates that a medicinal root brought to Greece from beyond the Bosphorus may have been rhubarb, commerce in the plant did not become securely established until Islamic times. During Islamic times, it was imported along the Silk Road, reaching Europe in the 14th century through the ports of Aleppo and Smyrna, where it became known as "Turkish rhubarb".[17] Later,[when?] it began to arrive via new maritime routes and overland through Russia. The "Russian rhubarb" was the most valued, probably because of the rhubarb-specific quality control system maintained by the Russian Empire.[18]

The cost of transportation across Asia made rhubarb expensive in medieval Europe. It was several times the price of other valuable herbs and spices such as cinnamon, opium, and saffron. The merchant explorer Marco Polo therefore searched for the place where the plant was grown and harvested, discovering that it was cultivated in the mountains of Tangut province.[16] The value of rhubarb can be seen in Ruy Gonzáles de Clavijo's report of his embassy in 1403–1405 to Timur in Samarkand: "The best of all merchandise coming to Samarkand was from China: especially silks, satins, musk, rubies, diamonds, pearls, and rhubarb...."[19]

The high price, as well as the increasing demand from apothecaries, stimulated efforts to cultivate the different species of rhubarb on European soil.[18] Certain species came to be grown in England to produce the roots.[20] The local availability of the plants grown for medicinal purposes, together with the increasing abundance and decreasing price of sugar in the 18th century, galvanised its culinary adoption.[18] Grieve claims a date of 1820 in England.[20] Rhubarb was harvested in Scotland from at least 1786, having been introduced to the Botanical Garden in Edinburgh by the traveller Bruce of Kinnaird in 1774. He brought the seeds from Abyssinia and they produced 3,000 plants.[21]

Though it is often asserted that rhubarb first came to the United States in the 1820s,[22] John Bartram was growing medicinal and culinary rhubarbs in Philadelphia from the 1730s, planting seeds sent to him by Peter Collinson.[23] From the first, the familiar garden rhubarb was not the only Rheum in American gardens: Thomas Jefferson planted R. undulatum at Monticello in 1809 and 1811, observing that it was "Esculent rhubarb, the leaves excellent as Spinach."[24]

الزريعات

The advocate of organic gardening Lawrence D. Hills listed his favourite rhubarb varieties for flavour as 'Hawke's Champagne', 'Victoria', 'Timperley Early', and 'Early Albert', also recommending 'Gaskin's Perpetual' for having the lowest level of oxalic acid, allowing it to be harvested over a much longer period of the growing season without developing excessive sourness.[25]

A homemade rhubarb pie

The Royal Horticultural Society has the UK's national collection of rhubarb that comprises 103 varieties. In 2021–2022 this was moved from southern England to the more northern garden RHS Bridgewater where winter cold and rainfall are better suited for rhubarb.[26] The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:[27]

  • 'Grandad's Favourite'[28]
  • 'Reed's Early Superb'[29]
  • 'Stein's Champagne'[30]
  • 'Timperley Early'[31]

الاستخدامات

الراوند النيء
(Rheum rhabarbarum)
القيمة الغذائية لكل 100 g (3.5 oz)
الطاقة88 kJ (21 kcal)
4.54 g
Sugars1.1 g
ألياف غذائية1.8 g
0.3 g
0.8 g
الڤيتامينات
ثيامين (B1)
(2%)
0.02 mg
ريبوفلاڤين (B2)
(3%)
0.03 mg
نياسين (B3)
(2%)
0.3 mg
(2%)
0.085 mg
ڤيتامين B6
(2%)
0.024 mg
فولات (B9)
(2%)
7 μg
Choline
(1%)
6.1 mg
Vitamin C
(10%)
8 mg
ڤيتامين E
(2%)
0.27 mg
ڤيتامين ك
(28%)
29.3 μg
آثار فلزات
كالسيوم
(9%)
86 mg
حديد
(2%)
0.22 mg
الماغنسيوم
(3%)
12 mg
المنگنيز
(9%)
0.196 mg
فوسفور
(2%)
14 mg
پوتاسيوم
(6%)
288 mg
صوديوم
(0%)
4 mg
زنك
(1%)
0.1 mg
مكونات أخرى
ماء94 g

Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database

Rhubarb is grown primarily for its fleshy leafstalks, technically known as petioles. The use of rhubarb stalks as food is a relatively recent innovation. This usage was first recorded in 18th- to 19th-century England after affordable sugar became more widely available.[18][20]

Commonly, it is stewed with sugar or used in pies and desserts, but it can also be put into savoury dishes or pickled. Rhubarb can be dehydrated and infused with fruit juice. In the United States, it is usually infused with strawberry juice to mimic the popular strawberry rhubarb pie.


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Food

The species Rheum ribes has been eaten in the Islamic world since the 10th century.[32]

In Northern Europe and North America, the stalks are commonly cut into pieces and stewed with added sugar until soft.[33] The resulting compote, sometimes thickened with corn starch, can then be used in pies, tarts and crumbles. Alternatively, greater quantities of sugar can be added with pectin to make jams. A paired spice used is ginger, although cinnamon and nutmeg are also common additions.

In the United Kingdom, as well as being used in the typical pies, tarts and crumbles, rhubarb compote is also combined with whipped cream or custard to make rhubarb fool. In the United States, the common usage of rhubarb in pies has led to it being nicknamed "pie plant", by which it is referred to in 19th-century cookbooks.[34] Rhubarb in the US is also often paired with strawberries to make strawberry-rhubarb pie, though some rhubarb purists jokingly consider this "a rather unhappy marriage".[34]

Rhubarb can also be used to make alcoholic drinks, such as fruit wines or Finnish rhubarb sima (mead). It is also used to make Kompot.[35]

Nutrition

Raw rhubarb is 94% water, 5% carbohydrates, 1% protein, and contains negligible fat (table). In a 100-gram (3+12-ounce) reference amount, raw rhubarb supplies 88 kilojoules (21 kilocalories) of food energy, and is a rich source of vitamin K (28% of the Daily Value, DV), a moderate source of vitamin C (10% DV), and contains no other micronutrients in significant amounts (table).

Traditional Chinese medicine

In traditional Chinese medicine, rhubarb roots of several species were used as a laxative for several millennia,[36] although there is no clinical evidence to indicate such use is effective.[37]

Rhubarb is grown primarily for its fleshy leafstalks, technically known as petioles. The use of rhubarb stalks as food is a relatively recent innovation. This usage was first recorded in 18th- to 19th-century England after affordable sugar became more widely available.[18][20]

Commonly, it is stewed with sugar or used in pies and desserts, but it can also be put into savoury dishes or pickled. Rhubarb can be dehydrated and infused with fruit juice. In the United States, it is usually infused with strawberry juice to mimic the popular strawberry rhubarb pie.

Food

The species Rheum ribes has been eaten in the Islamic world since the 10th century.[38]

In Northern Europe and North America, the stalks are commonly cut into pieces and stewed with added sugar until soft.[39] The resulting compote, sometimes thickened with corn starch, can then be used in pies, tarts and crumbles. Alternatively, greater quantities of sugar can be added with pectin to make jams. A paired spice used is ginger, although cinnamon and nutmeg are also common additions.

In the United Kingdom, as well as being used in the typical pies, tarts and crumbles, rhubarb compote is also combined with whipped cream or custard to make rhubarb fool. In the United States, the common usage of rhubarb in pies has led to it being nicknamed "pie plant", by which it is referred to in 19th-century cookbooks.[34] Rhubarb in the US is also often paired with strawberries to make strawberry-rhubarb pie, though some rhubarb purists jokingly consider this "a rather unhappy marriage".[34]

Rhubarb can also be used to make alcoholic drinks, such as fruit wines or Finnish rhubarb sima (mead). It is also used to make Kompot.[40]

Nutrition

Raw rhubarb is 94% water, 5% carbohydrates, 1% protein, and contains negligible fat (table). In a 100-gram (3+12-ounce) reference amount, raw rhubarb supplies 88 kilojoules (21 kilocalories) of food energy, and is a rich source of vitamin K (28% of the Daily Value, DV), a moderate source of vitamin C (10% DV), and contains no other micronutrients in significant amounts (table).

Traditional Chinese medicine

In traditional Chinese medicine, rhubarb roots of several species were used as a laxative for several millennia,[36] although there is no clinical evidence to indicate such use is effective.[37]

المواد الفعالة

تحتوي المادة الفعالة في الراوند على حوالي 10 % من الكينونات وهي أهم ما فيه، بالإضافة إلى مواد دابغة أخرى. المستعمل منه ريزومات الجذر للنبات المعمر لعامين أو ثلاثة، وهي تحتوي على مادة ذات رائحة متميزة وطعم مر. درنات الراوند هو أحد الخضراوات التي تنمو على تنمو على نباتات دائمة الخضرة. ومصدره الأصلي منغوليا. ولكنه ينمو في الأقاليم المعتدلة في أوروبا وأمريكا. ويشكل جذراً تخزينياً أصفر كبيراً، ومجموعة من الجذور التي تمده بالغذاء تحت الأرض. وينتج جذره الموجود براعم، تنمو منها سيقان ورقية بها أوراق كبيرة. ويستخدم الناس السيقان ذات العصير المائل كغذاء. وتحتوي الأوراق على أملاح حمضية سامة من الأوكسالات. وعادة ما يطهو الناس الراوند كحلوى. وكثيراً ما يستخدم حشواً للفطائر وأيضاً كنوع من الصلصة.

ويحتوي الراوند على نسبة محدودة من فيتامين"ج" وله خواص تليينية. ويوجد به مادة بالإنجليزية: anthraquinones في الصيف المسهلة وتانين قابض ويوقف الإسهال، وبه مادة anthranoles في الصيف. والمسحوق طعمه مر ولو أخذ بكميات قليلة يفتح الشهية. ويستعمل لعلاج الإمساك والدوسنتاريا والديدان الدبوسية وقرحة الإثني عشر. وينشط نزول دم الحيض. ويستعمل كدهان لمنع نزيف البواسير. وكمضمضة لعلاج قرح الفم.

Rhubarb.jpg

راوند (Rhubarb) أو درنات الراوند بها مادة anthraquinones المسهلة وتانين قابض ويوقف الإسهال ،. والمسحوق طعمه مر ولو أخذ بكميات قليلة يفتح الشهية .ويستعمل لعلاج الإمساك والدوسنتاريا والديدان الدبوسية وقرحة الإثني عشر. وينشط نزول دم الحيض. ويستعمل كدهان لمنع نزيف البواسير. و كمضمضة لعلاج قرح الفم .

فطيرة الراوند

الخصائص الطبية

  • يستعمل مغلي أو صبغة جذر الراوند كمقو للمعدة.
  • يستخدم المسحوق المستخلص منه لفتح الشهية وعلاج الإمساك المزمن واضطرابات والتهابات المعدة.
  • الجرعات الخفيفة من الصبغة (5 ـ 10) نقاط قابضة وتستعمل للإسهال، والجرعات المركزة (1 مل) تستعمل كمنبه ومنشط لعمل الكبد.
  • ينصح المصابون بحصى الكلى بعدم استعمال الراوند بكثرة.
  • يحظر استعمال الأوراق فمن المحتمل أن تكون سامة.
  • ينصح بتجنب العشبة أثناء الحمل لأنها مسهل قوي.

Pests

Rhubarb is a host to the rhubarb curculio, Lixus concavus, which is a weevil. Damage is mainly visible on leaves and stalks, with gummosis and oval or circular feeding and egg-laying sites.[41]

Hungry wildlife may dig up and eat rhubarb roots in the spring, as stored starches are turned to sugars for new foliage growth.

Cookbook

Wikibooks
Wikibooks Cookbook has an article on


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Gallery

الهامش

  1. ^ Foust, Clifford M.; Marshall, Dale E. (1 November 1991). "Culinary Rhubarb Production in North America: History and Recent Statistics". HortScience. 26 (11): 1360–1363. doi:10.21273/hortsci.26.11.1360. ISSN 0018-5345.
  2. ^ Tanhuanpää, Pirjo; Suojala-Ahlfors, Terhi & Hartikainen, Merja (2019). "Genetic diversity of Finnish home garden rhubarbs (Rheum spp.) assessed by simple sequence repeat markers". Genetic Resources and Crop Evolution. 66 (1): 17–25. doi:10.1007/s10722-018-0692-8. S2CID 52821042.
  3. ^ Libert, Bo & Englund, Roger (1989). "Present Distribution and Ecology of Rheum rhaponticum (Polygonaceae)". Willdenowia. 19 (1): 91–98. JSTOR 3996925.
  4. ^ Hood, Karen Jean Matsko (2014-01-01). Rhubarb Delights Cookbook: A Collection of Rhubarb Recipes (in الإنجليزية). Spokane Valley: Whispering Pine Press International. pp. 20, 22. ISBN 978-1-930948-00-6.
  5. ^ "RHS Plantfinder – Rhubarb". Retrieved 23 September 2018.
  6. ^ أ ب "Rhubarb". Royal Horticultural Society. Retrieved 23 January 2022.
  7. ^ Rombauer, Irma S. (1975) Joy of Cooking. Indianapolis/New York: Bobbs-Merrill Co., Inc. p. 142. ISBN 978-0672518317
  8. ^ McGee, Harold (2004). On Food and Cooking. New York, NY: Scribner. p 367. ISBN 978-0-684-80001-1
  9. ^ Wakefield Metropolitan District Council. "Rhubarb". Archived from the original on 30 September 2008. Retrieved 12 March 2006.
  10. ^ Support, Extension Web (19 June 2018). "Rhubarb". Ag - Processed Vegetables. Oregon State University. Retrieved 18 November 2022.
  11. ^ Learn To Grow (31 July 2015), How To Harvest Rhubarb, https://www.youtube.com/watch?v=xU392gqTHLU, retrieved on 17 May 2017 
  12. ^ "Pierce County Agriculture". 31 July 2009. Archived from the original on 31 July 2009. Retrieved 30 July 2018.
  13. ^ "Growing Rhubarb in the Home Garden". Ohio State University Extension Fact Sheet. Archived from the original on 5 June 2013. Retrieved 4 June 2013.
  14. ^ "Rhubarb Varieties". Rhubarbinfo.com. 1 September 2004. Retrieved 5 March 2010.
  15. ^ Mehta, Sweety (27 December 2012). "Pharmacognosy of Rhubarb". PharmaXChange.info.
  16. ^ أ ب John Uri Lloyd (1921). Origin and History of All the Pharmacopeial Vegetable Drugs, Chemicals and Origin and History of All the Pharmacopeial Vegetable Drugs, Chemicals and Preparations with Bibliography. Vol. 1. Read Books. ISBN 978-1-4086-8990-5.
  17. ^ Warmington, E. H. (1928). The Commerce Between the Roman Empire and India. Cambridge: Cambridge University Press. p. 207ff. ISBN 978-1-00-136124-6.
  18. ^ أ ب ت ث ج Monahan, Erika (2013). "Locating rhubarb". In Findlen, Paula (ed.). Early modern things: objects and their histories, 1500–1800. Abingdon: Routledge. pp. 227–251. ISBN 978-0-415-52051-5.
  19. ^ Quoted in Wood, Frances (2002). The Silk Road: Two Thousand Years in the Heart of Asia. University of California Press. p. 13. ISBN 978-0-520-24340-8.
  20. ^ أ ب ت ث Grieve, M. (1900). "Rhubarbs". botanical.com. A Modern Herbal. Retrieved 2023-02-23.
  21. ^ Grants Old and New Edinburgh
  22. ^ Waters, Alice (2002) Chez Panisse Fruit. New York: Harper Collins. p. 278. ISBN 978-0060199579
  23. ^ Fry, Joel (2012-07-20). David H (ed.). "Did John Bartram introduce rhubarb to North America?". Growing History (in الإنجليزية). Retrieved 2023-02-23.
  24. ^ "Rhubarb « Thomas Jefferson's Monticello". 2011-06-12. Archived from the original on 12 June 2011. Retrieved 2023-02-23.
  25. ^ Lawrence D Hills. Organic Gardening. Penguin 1997. page 145
  26. ^ "RHS Bridgwater". RHS Garden Bridgewater Instagram. Retrieved 23 January 2022.
  27. ^ "AGM Plants – Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 84. Retrieved 27 September 2018.
  28. ^ "RHS Plantfinder – Rheum × hybridum 'Grandad's Favourite'". Retrieved 23 September 2018.
  29. ^ "RHS Plantfinder – Rheum × hybridum 'Reed's Early Superb'". Retrieved 23 September 2018.
  30. ^ "RHS Plantfinder – Rheum × hybridum 'Stein's Champagne'". Retrieved 23 September 2018.
  31. ^ "RHS Plantfinder – Rheum × hybridum 'Timperley Early'". Retrieved 23 September 2018.
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  33. ^ Lyle, Katie Letcher (2010) [2004]. The Complete Guide to Edible Wild Plants, Mushrooms, Fruits, and Nuts: How to Find, Identify, and Cook Them (2nd ed.). Guilford, CN: FalconGuides. p. 111. ISBN 978-1-59921-887-8. OCLC 560560606.
  34. ^ أ ب ت ث Neal, Bill (2003) [1990]. Biscuits, Spoonbread and Sweet Potato Pie. Chapel Hill, NC: University of North Carolina Press. p. 308. ISBN 978-0807854747.
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  36. ^ أ ب Barceloux, Donald G (2012). Medical Toxicology of Natural Substances: Foods, Fungi, Medicinal Herbs, Plants, and Venomous Animals. John Wiley & Sons. p. 235. ISBN 978-1-118-38276-9.
  37. ^ أ ب خطأ استشهاد: وسم <ref> غير صحيح؛ لا نص تم توفيره للمراجع المسماة drugs
  38. ^ "Andalusian Cookbook: Table of Contents". www.daviddfriedman.com. Retrieved 2023-02-23.
  39. ^ Lyle, Katie Letcher (2010) [2004]. The Complete Guide to Edible Wild Plants, Mushrooms, Fruits, and Nuts: How to Find, Identify, and Cook Them (2nd ed.). Guilford, CN: FalconGuides. p. 111. ISBN 978-1-59921-887-8. OCLC 560560606.
  40. ^ "Rhubarb Compote". Epicurious (in الإنجليزية الأمريكية). 7 April 2008. Retrieved 2023-02-23.
  41. ^ "Extension & Public Outreach" (PDF). cornell.edu.
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