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Leaf vegetable

From Wikipedia, the free encyclopedia

Spinach leaves in a colander
A bundle of curly-leaf kale

Leaf vegetables, also called leafy greens, pot herbs, vegetable greens, or simply greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Leaf vegetables eaten raw in a salad can be called salad greens.

Nearly one thousand species of plants with edible leaves are known. Leaf vegetables most often come from short-lived herbaceous plants, such as lettuce and spinach. Woody plants of various species also provide edible leaves.

The leaves of many fodder crops are also edible for humans, but are usually only eaten under famine conditions. Examples include alfalfa, clover, and most grasses, including wheat and barley. Food processing, such as drying and grinding into powder or pulping and pressing for juice, may be used to involve these crop leaves in a diet.

Leaf vegetables contain many typical plant nutrients, but since they are photosynthetic tissues, their vitamin K levels are particularly notable. Phylloquinone, the most common form of the vitamin, is directly involved in photosynthesis.

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  • Leaf vegetable

Transcription

Nutrition

Spinach, as an example of a leaf vegetable, is low in calories and fat per calorie, and high in dietary fiber, vitamin C, pro-vitamin A carotenoids, folate, manganese and vitamin K.[1]

The vitamin K content of leaf vegetables is particularly high, since these are photosynthetic tissues and phylloquinone is involved in photosynthesis.[2] Accordingly, users of vitamin K antagonist medications, such as warfarin, must take special care to limit the consumption of leaf vegetables.[3]

Preparation

Large pot of collard greens being prepared on a US Navy ship

If leaves are cooked for food, they may be referred to as boiled greens. Leaf vegetables may be stir-fried, stewed, steamed, or consumed raw. Leaf vegetables stewed with pork is a traditional dish in soul food and Southern U.S. cuisine. They are also commonly eaten in a variety of South Asian dishes such as saag. Leafy greens can be used to wrap other ingredients into an edible package in a manner similar to a tortilla. Many green leafy vegetables, such as lettuce or spinach, can also be eaten raw, for example in sandwiches or salads. A green smoothie enables large quantities of raw leafy greens to be consumed by blending the leaves with fruit and water.

Africa

Liponda greens to be cooked and accompany ugali in east Africa

In certain countries of Africa, various species of nutritious amaranth are very widely eaten boiled.[4]

Celosia argentea var. argentea or "Lagos spinach" is one of the main boiled greens in West African cuisine.[5]

Greece

In Greek cuisine, khorta (χόρτα, literally 'greens') are a common side dish, eaten hot or cold and usually seasoned with olive oil and lemon.[6]

At least 80 different kinds of greens are used, depending on the area and season, including black mustard, dandelion, wild sorrel, chicory, fennel, chard, kale, mallow, black nightshade, lamb's quarters, wild leeks, hoary mustard, charlock, smooth sow thistle and even the fresh leaves of the caper plant.

Italy

Ligurian pansoti filled with preboggion boiled greens and served with nut sauce

Preboggion, a mixture of different wild boiled greens, is used in Ligurian cuisine to stuff ravioli and pansoti.[7] One of the main ingredients of preboggion are borage (Borago officinalis) leaves. Preboggion is also sometimes added to minestrone soup and frittata.[8]

Poland

Botwinka (or boćwinka) is a soup that features beet stems and leaves as one of its main ingredients. The word "botwinka" is the diminutive form of "botwina" which refers to leafy vegetables like chard and beet leaves.

United States

In the cuisine of the Southern United States and traditional African-American cuisine, turnip, collard, kale, garden cress, dandelion, mustard, and pokeweed greens are commonly cooked, and often served with pieces of ham or bacon. The boiling water, called potlikker, is used as broth. Water in which pokeweed has been prepared contains toxins removed by the boiling, and should be discarded.[9]

Sauteed escarole is a primary ingredient in the Italian-American dish Utica greens.

List of leaf vegetables

Postharvest diseases

Postharvest diseases cause up to 50% losses of leaf vegetables. These are fungal, bacterial, and much less commonly viral. The most important remedy is temperature controlled storage, although also important is prevention of mechanical damage to produce as this provides entryways for pathogens. Uncontaminated water for washing of the vegetables is of lesser but still significant importance.[10]

Common bacterial pathogens include: <i>Xanthomonas campestris</i> pv. <i>vitians</i>, Pseudomonas viridiflava, P. cichorii, and P. marginalis, <i>P. syringae</i> pv. <i>aptata</i>, X. campestris pv. campestris, X. campestris pv. raphani, <i>P. syringae</i> pv. <i>maculicola</i>, <i>P. syringae</i> pv. <i>alisalensis</i>, Pectobacterium spp. including <i>Pectobacterium carotovorum</i> subsp. <i>odoriferum</i> and Pectobacterium aroidearum, Dickeya spp., Pseudomonas marginalis, and Pseudomonas viridiflava.[10]

Common fungal pathogens include: Alternaria brassicicola, A. alternata, A. arborescens, A. tenuissima, A. japonica, Colletotrichum higginsianum, Colletotrichum dematium f. spinaciae, Microdochium panattonianum, Stemphylium botryosum, Cladosporium variabile, Cercospora beticola, C. lactucae-sativae, C. brassicicola, C. acetosella, Botrytis cinerea, Golovinomyces cichoracearum, Podosphaera fusca, Erysiphe cruciferarum, E. polygoni, E. heraclei, Sclerotinia sclerotiorum, and S. minor.[10]

Common oomycete pathogens include: Albugo occidentalis, A. ipomoeae-aquaticae, A. candida, Hyaloperonospora parasitica, Bremia lactucae, Peronospora effusa, and Peronospora farinosa f.sp. betae.[10]

Fungicides such as prochloraz can be used to manage some of these.[10]

Gallery

See also

References

  1. ^ "Nutrition facts for raw spinach per 100 g; USDA Nutrient Data SR-21". 2014. Archived from the original on 20 September 2014. Retrieved 15 September 2014.
  2. ^ Kessler, F.; Glauser, G. (2014). "Prenylquinone Profiling in Whole Leaves and Chloroplast Subfractions". Plant Isoprenoids. Methods in Molecular Biology. Vol. 1153. pp. 213–26. doi:10.1007/978-1-4939-0606-2_15. ISBN 978-1-4939-0605-5. PMID 24777800.
  3. ^ Chang, C. -H.; Wang, Y. -W.; Yeh Liu, P. -Y.; Kao Yang, Y. -H. (2014). "A practical approach to minimize the interaction of dietary vitamin K with warfarin". Journal of Clinical Pharmacy and Therapeutics. 39 (1): 56–60. doi:10.1111/jcpt.12104. PMID 24383939. S2CID 206036115.
  4. ^ National Research Council (U.S.), Board on Science and Technology for International Development, Lost Crops of Africa: Vegetables, pp. 6, 35f. Books Archived 20 March 2015 at the Wayback Machine
  5. ^ "ECHO". Archived from the original on 10 May 2010. Retrieved 6 May 2019.
  6. ^ Lynn Livanos Athan. "Horta Vrasta – Boiled Leafy Greens". About.com Food. Archived from the original on 20 February 2009. Retrieved 6 June 2012.
  7. ^ "dall'olio al preboggion". cogornese.it. Archived from the original on 6 March 2012. Retrieved 6 June 2012.
  8. ^ "Liguria-style omelette with borage and sausage". Italian recipes – Italian food culture – Academia Barilla. Archived from the original on 19 August 2014. Retrieved 8 June 2015.
  9. ^ Thayer, Samuel (2017). Incredible Wild Edibles. Forager's Harvest. pp. 273, 276. ISBN 978-0-9766266-2-6. Pokeweed must be prepared properly or it is dangerous. ... The only parts of poke to be eaten are the young shoots and tender stem tips, along with their immature, meristematic leaves. These must be boiled in an ample pot of water and then drained. Eating poke raw can cause serious poisoning. ... [A] man became ill from drinking water in which mature poke leaves had been boiled (Jaeckle and Freemon 1981).
  10. ^ a b c d e Golding, John; Tesoriero, Len; Daniel, Rosalie (2020). "10 - Leafy Vegetables". In Lluís Palou; Joseph L. Smilanick (eds.). Postharvest pathology of fresh horticultural produce. Boca Raton, FL: CRC Press. p. xviii+823. ISBN 978-1-315-20918-0. OCLC 1104856309. ISBN 9781351805889 ISBN 9781351805896 ISBN 9781138630833
This page was last edited on 27 February 2024, at 01:48
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