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Medicago

From Wikipedia, the free encyclopedia
This article is about the plant genus. For the biotech company, see Medicago Inc. For other uses, see Medicago (disambiguation).

Medicago
Anatomical diagram of Medicago flowers
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Spermatophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Clade: Inverted repeat-lacking clade
Tribe: Trifolieae
Genus: Medicago
L. (1753)
Type species
Medicago sativa
Species

87–105; see text.

Synonyms[1]
List
    • Cochleata Medik. (1787)
    • Crimaea Vassilcz. (1979)
    • Diploprion Viv. (1824)
    • Factorovskya Eig (1927)
    • Kamiella Vassilcz. (1979)
    • Lupularia (Serg.) Opiz (1852), nom. superfl.
    • Lupulina Noulet (1837), nom. superfl.
    • Medica Mill. (1754)
    • Medicula Medik. (1787)
    • Nephromedia Kostel. (1844)
    • Rhodusia Vassilcz. (1972)
    • Spirocarpus Opiz (1852)
    • Trifillum Medik. (1787)
    • Turukhania Vassilcz. (1979)

Medicago is a genus of flowering plants, commonly known as medick or burclover, in the legume family (Fabaceae). It contains at least 87 species. The genus name is based on the Latin name for that plant, medica, from Greek: μηδική (πόα) Median (grass).

The genus is distributed mainly around the Mediterranean Basin, also extending across temperate Eurasia and sub-Saharan Africa. Its best-known member is alfalfa (M. sativa), an important forage crop.

Description

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Most members of the genus are low, creeping herbs, resembling clover, but with burs (hence the common name). However, alfalfa grows to a height of 1 metre (3+1⁄2 ft), and tree medick (M. arborea) is a shrub. Members of the genus are known to produce bioactive compounds such as medicarpin (a flavonoid) and medicagenic acid (a triterpenoid saponin).[2] Chromosome numbers in Medicago range from 2n = 14 to 48.[3]

Taxonomy

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The species Medicago truncatula is a model legume[4] due to its relatively small stature, small genome (450–500 Mbp), short generation time (about 3 months), and ability to reproduce both by outcrossing and selfing.

Comprehensive descriptions of the genus are Lesinš and Lesinš 1979[5] and Small and Jomphe 1989.[6] Major collections are SARDI (Australia),[7] USDA-GRIN (United States),[8] ICARDA (Syria),[9] and INRA (France).[10]

Species

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The genus contains at least 87 species.[6][11][12]

Recent molecular phylogenic analyses of Medicago indicate that the sections and subsections defined by Small & Jomphe, as outlined below, are generally polyphyletic.[13][14][15][16] However, with minor revisions sections and subsections could be rendered monophyletic.[15][16]

Section Buceras

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Subsection Deflexae
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Subsection Erectae
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Subsection Isthmocarpae
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Subsection Reflexae
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Section Carstiensae

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Section Dendrotelis

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Section Geocarpa

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Section Heynianae

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Section Hymenocarpos

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Section Lunatae

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Section Lupularia

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Section Medicago

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Section Orbiculares

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Section Platycarpae

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Subsection Rotatae
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Section Spirocarpos

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Subsection Intertextae
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Subsection Leptospireae
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Subsection Pachyspireae
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Species names with uncertain taxonomic status

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The status of the following species is unresolved:[6]

  • Medicago agropyretorum Vassilcz.
  • Medicago alatavica Vassilcz.
  • Medicago caucasica Vassilcz.
  • Medicago cyrenaea Maire & Weiller
  • Medicago difalcata Sinskaya
  • Medicago grossheimii Vassilcz.
  • Medicago gunibica Vassilcz.
  • Medicago hemicoerulea Sinskaya
  • Medicago karatschaica (A. Heller) A. Heller
  • Medicago komarovii Vassilcz.
  • Medicago meyeri Gruner
  • Medicago polychroa Grossh.
  • Medicago schischkinii Sumnev.
  • Medicago talyschensis Latsch.
  • Medicago transoxana Vassilcz.
  • Medicago tunetana (Murb.) A.W. Hill
  • Medicago vardanis Vassilcz.
  • Medicago virescens Grossh.

Evolution

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Medicago diverged from Glycine (soybean) about 53–55 million years ago (in the early Eocene),[18] from Lotus (deervetch) 49–51 million years ago (also in the Eocene),[18] and from Trigonella 10–22 million years ago (in the Miocene).[15]

Etymology

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The genus name is based on the Latin name for alfalfa, medica, from Greek: μηδική (πόα) Median (grass).[19]

Distribution and habitat

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The genus is distributed mainly around the Mediterranean Basin,[13][2] also extending across temperate Eurasia and sub-Saharan Africa.[1]

Ecology

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Symbiosis with nitrogen-fixing rhizobia

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Béna et al. (2005) constructed a molecular phylogeny of 23 Sinorhizobium strains and tested the symbiotic ability of six strains with 35 Medicago species.[14] Comparison of these phylogenies indicates many transitions in the compatibility of the association over evolutionary time. Furthermore, they propose that the geographical distribution of strains limits the distribution of particular Medicago species.

Insect herbivores

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Medicago species are used as food plants by the larvae of some Lepidoptera species including the common swift, flame, latticed heath, lime-speck pug, nutmeg, setaceous Hebrew character, and turnip moths and case-bearers of the genus Coleophora, including C. frischella (recorded on M. sativa) and C. fuscociliella (feeds exclusively on Medicago spp.).[citation needed]

Agricultural uses

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Agronomic research has been conducted on Medicago species. Other than its best-known member, alfalfa,[20] several of the prostrate members of the family (such as M. lupulina and M. truncatula) have been used as forage crops.[21] Select species in the Medicago genus naturally develop spiney pods during the reproductive phase of growth (such as M. intertexta and M. polymorpha). Despite having high levels of agronomic performance, these are typically viewed as undesirable in sheep based farming systems due to their ability to become lodged in wool, reducing fleece value.[22] Breeding efforts in the 1990s have yielded spineless varieties of burr medic, providing valuable production amongst farming systems in low rainfall (<300mm annual), free draining, alkaline soils.[23]

Notes

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  1. ^ Some sources treat Medicago citrina as a synonym of Medicago arborea.
  2. ^ The validity of Medicago sinskiae has been questioned by Small and Jomphe, 1988.[6]

References

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  1. ^ a b Medicago L. Plants of the World Online. Retrieved 6 September 2023.
  2. ^ a b Gholami A, De Geyter N, Pollier J, Goormachtig S, Goossens A (2014). "Natural product biosynthesis in Medicago species". Natural Product Reports. 31 (3): 356–380. doi:10.1039/C3NP70104B. PMID 24481477.
  3. ^ Rosato M, Galián JA, Rosselló JA (2012). "Amplification, contraction and genomic spread of a satellite DNA family (E180) in Medicago (Fabaceae) and allied genera". Ann Bot. 109 (4): 773–82. doi:10.1093/aob/mcr309. PMC 3286279. PMID 22186276.
  4. ^ "Medicago truncatula". Archived from the original on 29 December 2008. Retrieved 21 November 2008.
  5. ^ Lesinš KA, Lesinš I (1979). Genus Medicago (Leguminosae): A Taxogenetic Study. The Hague, The Netherlands: Dr. W. Junk B. V. Publishers. p. 132. ISBN 978-90-6193-598-8.
  6. ^ a b c d Small E, Jomphe M (1989). "A Synopsis of the Genus Medicago (Leguminosae)". Can J Bot. 67 (11): 3260–94. Bibcode:1989CaJB...67.3260S. doi:10.1139/b89-405.
  7. ^ "SARDI". Archived from the original on 26 October 2008. Retrieved 21 November 2008.
  8. ^ "GRIN National Genetic Resources Program". Archived from the original on 14 August 2009. Retrieved 21 November 2008.
  9. ^ "ICARDA Sustainable Agriculture for the Dry Areas". Archived from the original on 11 December 2008. Retrieved 21 November 2008.
  10. ^ "INRA". Archived from the original on 31 July 2010. Retrieved 21 November 2008.
  11. ^ Multiple sources:
  12. ^ "The Biota of North America Program".[permanent dead link]
  13. ^ a b Steele KP, Ickert-Bond SM, Zarre S, Wojciechowski MF (2010). "Phylogeny and character evolution in Medicago (Leguminosae): Evidence from analyses of plastid trnK/matK and nuclear GA3ox1 sequences". Am J Bot. 97 (7): 1142–1155. Bibcode:2010AmJB...97.1142S. doi:10.3732/ajb.1000009. PMID 21616866.
  14. ^ a b Béna G, Lyet A, Huguet T, Olivier I (2005). "Medicago–Sinorhizobium symbiotic specificity evolution and the geographic expansion of Medicago". J. Evol. Biol. 18 (6): 1547–58. doi:10.1111/j.1420-9101.2005.00952.x. PMID 16313467. S2CID 24813001.
  15. ^ a b c Maureira Butler IJ, Pfeil BE, Muangprom A, Osborn TC, Doyle JJ (2008). "The reticulate history of Medicago (Fabaceae)". Syst Biol. 57 (6): 466–482. doi:10.1080/10635150802172168. PMID 18570039.
  16. ^ a b Multiple sources:
  17. ^ Gillespie DJ, McComb JA (1991). "Morphology and distribution of species in the Medicago murex complex". Can J Bot. 69 (12): 2655–2662. Bibcode:1991CaJB...69.2655G. doi:10.1139/b91-333.
  18. ^ a b Cannon S. (2008). "3. Legume Comparative Genomics" (PDF). In Stacey G (ed.). Genetics and Genomics of Soybean. Plant Genetics and Genomics: Crops and Models. Vol. II. New York, NY: Springer. p. 38. ISBN 978-0-387-72298-6. Archived from the original (PDF) on 2011-08-14.
  19. ^ New Oxford American Dictionary (2nd ed., 2005), p. 1054, s.v. medick.
  20. ^ "Alfalfa Crop Germplasm Committee Report, 2000". Archived from the original on 2009-05-05. Retrieved 2009-11-04.
  21. ^ "Black Medic (Medicago lupulina) | Mississippi State University Extension Service". extension.msstate.edu. Archived from the original on 2024-08-07. Retrieved 2024-08-07.
  22. ^ Belinda Hackney; Dr Brian Dear; Graham Crocker. "Naturalised pasture legumes" (PDF). primefacts. NSW DPI.
  23. ^ "Factsheet - Spineless burr medic". keys.lucidcentral.org.
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  • Wikispecies logo Data related to Medicago at Wikispecies
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