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Raphanus raphanistrum

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Raphanus raphanistrum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Brassicales
Family: Brassicaceae
Genus: Raphanus
Species:
R. raphanistrum
Binomial name
Raphanus raphanistrum
Habit

Raphanus raphanistrum, also known as wild radish, white charlock or jointed charlock,[1] is a flowering plant in the family Brassicaceae. The species is native to western Asia, Europe and parts of Northern Africa. It has been introduced into most parts of the world and is regarded as a habitat threatening invasive species in many areas, for example, Australia. It spreads rapidly and is often found growing on roadsides or in other places where the ground has been disturbed. The cultivated radish, widely used as a root vegetable, is sometimes considered to be one of its subspecies as Raphanus raphanistrum subsp. sativus.

Description

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The petals have a characteristic pattern of veins

Wild radish is an annual that grows up to 75 cm tall, variously branched to multi-stemmed, with a distinct slender taproot which does not swell like that of the cultivated radish. The stems are green and sometimes purple at the base and nodes, round in cross section and slightly ridged, and bristly-hairy all over. It has a basal rosette of pinnate leaves to 38 cm long, with a 3 cm stalk (petiole) and a large rounded terminal lobe that has a undulate margin; the lateral lobes sometimes overlap the midrib. The stem leaves become progressively less lobed as they ascend, and more acutely serrated. Both the upper and lower surface of each leaf is roughly hairy, as are the leaf margins, which have minutely bulbous-based hairs projecting horizontally. The leaves have green or purple tips (hydathodes) on each tooth.[2][3][4]

The basal leaves are often pinnately divided.

The flowering period is between May and October in northern Europe, or between June and August in Minnesota.[5] The inflorescence is a lax raceme, terminal or arising from the leaf axil, up to 34 cm long with up to 42 flowers. The flowers have four white (sometimes yellow or purple) petals, up to 24 mm long, sometimes with dark veins (especially on the underside). Each petal has a rounded "limb" above a narrow "claw", both about the same length. The four upright sepals are shorter than the petals, green or purple, and have sparse bulbous-based hairs. There are 6 stamens (2 short and 4 long) and one style with two stigmas.[2]

The fruits are borne on bristly-hairy pedicels about 3 cm long and held vertically (whether the rhachis is erect or sprawling). Each fruit consists of a pod with two segments: the lower one is about 1-2 mm long and sterile (just occasionally with one seed), while the upper one is up to 8 cm long and has 1-10 fertile segments (mericarps), each containing one oval seed up to 3 mm long. At the tip of the pod is a sterile beak up to 2.5 cm long. The fruits are terete, smooth or slightly ridged, and glabrous to roughly hairy, with a peppery taste. At the tip of the beak is the persistent, sessile white stigma.[3][2][6]

Taxonomy

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It was formally described by the Swedish botanist Carl Linnaeus in his seminal publication 'Species Plantarum' on page 669 in 1753.[7][8][9]

The genome of wild radish is estimated to be ~515 Mb in size,[10] whereas that of the edible variety is suggested to be ~539–574 Mb.[11][12][13] Several Raphanus raphanistrum genomes have been sequenced,[10][12][13] with one study reporting 98% coverage of the gene space.[13] Researchers found evidence that the past whole-genome triplication that occurred before the divergence of Raphanus and Brassica has been followed by widespread gene loss in radish, resulting in the loss of ~38,000 genes from the wild radish genome.[10]

Raphanus raphanistrum has several known subspecies including:

The scientific name Raphanus derives from the Ancient Greek name for a radish, ραφανίς (raphanis).[17] It has several common names including jointed charlock,[5] jointed radish, jointed wild radish, white charlock,[18] and wild radish.[9][19]

It is often erroneously identified as mustard.

Identification

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The flowers are very similar to those of the searocket, which is found in some of the same regions (in the US) and is easily distinguished from it by having thinner, non-succulent stems and leaves.[18]

Distribution and habitat

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It is native to temperate regions of North Africa, Europe and parts of Western Asia.[9]

Range

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It is found in North Africa, within Macaronesia, Madeira Islands, Canary Islands, Algeria, Egypt, Libya, Morocco and Tunisia. Within Western Asia it is found in the Caucasus, Armenia, Azerbaijan, Cyprus, Georgia, Iran, Iraq, Israel, Jordan, Lebanon, Syria and Turkey. In eastern Europe, it is found within Belarus, Moldova and Ukraine. In middle Europe, it is in Austria, Belgium, Czech Republic, Germany, Hungary, Netherlands, Poland, Slovakia and Switzerland. In northern Europe, in Denmark, Estonia, Finland, Ireland, Isle of Man, Latvia, Lithuania, Norway, Sweden and United Kingdom. In southeastern Europe, within Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Greece, Italy, Montenegro, North Macedonia, Romania, Serbia and Slovenia. Also in southwestern Europe, it is found in France, Portugal and Spain.[9]

Ecology

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Wild radish in a cereal field margin

It is frost hardy, and even hard freezes only temporarily interrupt bloom. In Australia, it is regarded as a habitat threatening invasive species in many areas.[20][21][22] In Canada, it is a naturalised species and sometimes hybridizes with cultivated radish, R. sativus. It has also proved to be resistant to several herbicides.[23]

In southeastern USA, the pale yellow form is common, sometimes entirely taking over fields in wintertime. It is a significant source of pollen and nectar for a variety of pollinators, especially honey bees during the very early spring starting buildup. Female Andrena agilissima, or mining bees, frequent this plant to obtain pollen and nectar.[24] Other pollinators include cabbage butterflies and a few syrphid fly species.[25]

Uses

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All tender parts of the plant are edible. The leaves and flowers have a spicy taste or aftertaste. The seedpods can be eaten, as can the outer skin of the root (after being washed).[26] It is said that John Walker cultivated sea radish root as an alternative to horseradish after discovering the plant on the west coast of Scotland as early as 1753.[27]

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  • Yellow form
    Yellow form
  • Seed pod
    Seed pod
  • Fruit
    Fruit
  • Red cultivated radishes, sometimes considered a subspecies
    Red cultivated radishes, sometimes considered a subspecies

References

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  1. ^ "Raphanus raphanistrum". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture.
  2. ^ a b c Stace, C.A. (2019). New Flora of the British Isles. Suffolk. ISBN 978-1-5272-2630-2.{{cite book}}: CS1 maint: location missing publisher (link)
  3. ^ a b Rich, T.C.G. (1991). Crucifers of Great Britain and Ireland. London: Botanical Society of the British Isles. ISBN 0901158208.
  4. ^ Poland, John; Clement, Eric (2009). The Vegetative Key to the British Flora. Southampton: John Poland. ISBN 978-0-9560144-0-5.
  5. ^ a b "Raphanus raphanistrum (Jointed Charlock)". Minnesota Wildflowers. Retrieved 8 November 2017.
  6. ^ Rose, Francis (2006). The Wild Flower Key. London: Frederick Warne. ISBN 978-0-7232-5175-0.
  7. ^ "Brassicaceae Raphanus raphanistrum L." ipni.org. Retrieved 8 November 2017.
  8. ^ a b "Raphanus raphanistrum L. is an accepted name". 23 March 2012. plantlist.org. Retrieved 8 November 2017.
  9. ^ a b c d "Taxon: Raphanus raphanistrum L." ars-grin.gov. Retrieved 8 November 2017.
  10. ^ a b c Moghe, Gaurav (May 2014). "Consequences of Whole-Genome Triplication as Revealed by Comparative Genomic Analyses of the Wild Radish Raphanus raphanistrum and Three Other Brassicaceae Species". The Plant Cell. 26 (5): 1925–1937. doi:10.1105/tpc.114.124297. PMC 4079359. PMID 24876251.
  11. ^ Johnston, J. Spencer; et al. (2005). "Evolution of Genome Size in Brassicaceae". Annals of Botany. 95 (1): 229–235. doi:10.1093/aob/mci016. PMC 1950721. PMID 15596470.
  12. ^ a b Mitsui, Yuki; et al. (2015). "The radish genome and comprehensive gene expression profile of tuberous root formation and development". Scientific Reports. 5: 10835. Bibcode:2015NatSR...510835M. doi:10.1038/srep10835. PMC 4650646. PMID 26056784.
  13. ^ a b c Jeong, Young-Min; et al. (2016). "Elucidating the triplicated ancestral genome structure of radish based on chromosome-level comparison with the Brassica genomes". Theoretical and Applied Genetics. 129 (7): 1357–1372. doi:10.1007/s00122-016-2708-0. PMID 27038817. S2CID 5764946.
  14. ^ "Tropicos.org Missouri Botanical Garden". Retrieved 4 July 2021.
  15. ^ "Tropicos.org Missouri Botanical Garden". Retrieved 4 July 2021.
  16. ^ "Tropicos.org Missouri Botanical Garden". Retrieved 4 July 2021.
  17. ^ Morwood, J.; Taylor, J. (2002). Pocket Oxford Classical Greek Dictionary. Oxford: Oxford University Press. ISBN 0-19-860512-9.
  18. ^ a b Reader's Digest Field Guide to the Wild Flowers of Britain. Reader's Digest. 1981. p. 40. ISBN 9780276002175.
  19. ^ USDA, NRCS (n.d.). "​Raphanus raphanistrum​". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 18 October 2015.
  20. ^ Peltzer, Sally. "Wild radish". Western Australia Department of Agriculture and Food. Retrieved 10 November 2015.
  21. ^ Western Australian Herbarium, Biodiversity and Conservation Science. "Raphanus raphanistrum (FloraBase—the Western Australian Flora)". florabase.dpaw.wa.gov.au. Retrieved 2020-03-20.
  22. ^ "Raphanus raphanistrum L." www.gbif.org. Retrieved 2020-03-20.
  23. ^ Warwick, Suzanne I.; Francis, Ardath (3 February 2005). "The biology of Canadian weeds. 132. Raphanus raphanistrum. L." Canadian Journal of Plant Science. 85 (3). Eastern Cereal and Oilseed Research Centre: 709–733. doi:10.4141/P04-120.
  24. ^ Giovanetti, Manuela; Lasso, Eloisa (July–September 2005). "Body size, loading capacity and rate of reproduction in the communal bee Andrena agilissima (Hymenoptera; Andrenidae)". Apidologie. 36 (3): 439–447. doi:10.1051/apido:2005028.
  25. ^ Koelling, Vanessa A.; Karoly, Keith (May 2007). "Self-pollen interference is absent in wild radish (Raphanus raphanistrum, Brassicaceae), a species with sporophytic self-incompatibility". Am. J. Bot. 94 (5): 896–900. doi:10.3732/ajb.94.5.896. hdl:1808/10342. PMID 21636458.
  26. ^ Nyerges, Christopher (2017). Foraging Washington: Finding, Identifying, and Preparing Edible Wild Foods. Guilford, CT: Falcon Guides. ISBN 978-1-4930-2534-3. OCLC 965922681.
  27. ^ Sowerby, James; Smith, James Edward (1806). English Botany: or, Coloured Figures of British Plants (First ed.).
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