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Leucaena leucocephala

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(Redirected from Koa haole)
"Ipil-ipil" redirects here. It is not to be confused with the Ipil plant.

Leucaena leucocephala
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Caesalpinioideae
Clade: Mimosoid clade
Genus: Leucaena
Species:
L. leucocephala
Binomial name
Leucaena leucocephala
Synonyms[3]
  • Acacia frondosa Willd.
  • Acacia glauca (L.) Willd.
  • Acacia leucocephala (Lam.) Link
  • Acacia leucophala Link
  • Leucaena glabra Benth.
  • Leucaena glauca[2] Benth.
  • Mimosa glauca sensu L.1763 Misapplied
  • Mimosa glauca Koenig ex Roxb.
  • Mimosa leucocephala Lam.
  • Mimosa leucophala Lam.

Leucaena leucocephala is a small fast-growing mimosoid tree native to southern Mexico and northern Central America (Belize and Guatemala)[1][4] and is now naturalized throughout the tropics including parts of Asia.

Common names include white leadtree,[5] white popinac,[1] horse tamarind,[1] ipil-ipil,[6][7] koa haole,[8] and tan-tan.[9]

Leucaena leucocephala is used for a variety of purposes, such as fencing, soil fertility, firewood, fiber, and livestock fodder.

Botany

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Leaves.

The river tamarind tree is small and grows up to 7–18 metres, its bark is grey and cracked. Its branches have no thorns, each branch has 6–8 pairs of leaf stalks that bear 11–23 pairs of leaflets, each leaflet is 8–17 mm long with a pale green surface and whitish underneath.[6][2]

Its inflorescence is a cream-coloured puff with many stamens. They produce flat and straight seed pods measuring 13–18 cm long that matures from a green colour to a brown; one pod contains between 15 and 30 seeds.[6]

  • L. leucocephala pods in the month of May, Nepal.
    L. leucocephala pods in the month of May, Nepal.
  • Dried L. leucocephala pod and seeds - MHNT
    Dried L. leucocephala pod and seeds - MHNT

Use by humans

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During the 1970s and 1980s, it was promoted as a "miracle tree" for its multiple uses.[10] It has also been described as a "conflict tree" because it is used for forage production but spreads like a weed in some places.[11]

The legume is promoted in several countries of Southeast Asia (at least Burma, Cambodia, Indonesia, Laos,[12] and Thailand), most importantly as a source of quality animal feed, but also for residual use for firewood or charcoal production.

Forage and fodder

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The legume provides an excellent source of high-protein cattle fodder.[13] However, the fodder contains mimosine, a toxic amino acid. Horses and donkeys which are fed it lose their hair.

In many cases this acid is metabolized by ruminants to goitrogenic DHP [3-hydroxy-4(1H) pyridone] in the rumen,[14][15] but in some geographical areas, ruminants lack the organisms (such as Synergistes jonesii) that can degrade DHP.

In such cases, toxicity problems from ingestion of Leucaena have sometimes been overcome by infusing susceptible animals with rumen fluid from ruminants that possess such organisms,[16] and more recently by inoculating cattle rumina with such organisms cultured in vitro.[17][18]

Such measures have facilitated Leucaena use for fodder in Australia and elsewhere.[18]

Green manure and biomass production

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Leucaena leucocephala has been considered for biomass production because its reported yield of foliage corresponds to a dried mass of 2,000–20,000 kg/ha/year, and that of wood 30–40 m³/ha/year, with up to twice those amounts in favorable climates. In India it is being promoted for both fodder and energy.[19]

It is also efficient in nitrogen fixation, at more than 500 kg/ha/year.

It has a very fast growth rate: young trees reach a height of more than 20 ft in two to three years.

Food for humans

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The young pods are edible and occasionally eaten in Javanese vegetable salad with spicy peanut sauce, and spicy fish wrapped in papaya or taro leaves in Indonesia, and in papaya salad in Laos[12] and Thailand, where they are known as phak krathin (Thai: ผักกระถิน).[20] In Mexico it is eaten in soups and also inside tacos, it is known as guaje. Additionally, the state of Oaxaca in Mexico derives its name from the Nahuatl word huaxyacac, the name for Leucaena leucocephala trees that are found around Oaxaca City.[21]

Pulpwood for paper industry

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Recently, the wood part of the Subabul tree is used for making pulp in the pulp and paper industry. In the southern and central states of India, Subabul is the most important pulpwood species for making pulp. It has huge positive socio-economic impact on the livelihood of the small farmers where Subabul is grown as an industrial crop. This provides an alternate crop choice to the farmers of Andhra Pradesh and Telangana states of India where they are also growing cotton and chillies.

Invasive properties

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Leucaena leucocephala is considered one of the 100 worst invasive species by the Invasive Species Specialist Group of the IUCN Species Survival Commission.[11]

It is a highly invasive species in the arid parts of Taiwan, The Bahamas, the Hawaiian Islands, Fiji, Puerto Rico, Hong Kong, South Africa,[22] and northern Australia,[23] as well as in northern Malay Peninsula,[2] South America and Southern Europe.[24]

The plant is also found in parts of the U.S., including California, Arizona, Texas, Hawaii, and Florida.[25]

Leucaena leucocephala wood and bark

It grows quickly and forms dense thickets that crowd out all native vegetation.[26]

In urban areas, it is an especially unwanted species, growing along arid roadsides, in carparks, and on abandoned land. [27] [28]

Other limitations

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This species is susceptible to insect infestations. In the 1980s, a widespread loss in Southeast Asia was due to pest attack by psyllids.[29]

In India, this tree was initially promoted for afforestation due to its fast-growing nature. However, it is now considered unsuitable for urban planting because of its tendency to get uprooted in rain and wind. Eight of every ten trees uprooted by wind in Pune are L. leucocephala.[30]

The seeds contain mimosine, an amino acid known to be toxic to nonruminant vertebrates.[10]

Potential as bioherbicidal agent

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Leucaena leucocephala is an allelopathic tree. Phytotoxic allelochemicals, such as mimosine and certain phenolic compounds, including p-hydroxycinnamic acid, protocatechuic acid, and gallic acid, have been identified in the leaves of the species.[31] Bioherbicidal activity of L. leucocephala on terrestrial plants[32][33] and aquatic weed water hyacinth[34] were reported.

[edit]
  • Flowers and immature fruit
    Flowers and immature fruit
  • Pollen
    Pollen
  • Sapling of Leucaena leucocephala. The cotyledons are visible.
    Sapling of Leucaena leucocephala. The cotyledons are visible.
  • Pod and seeds
    Pod and seeds
  • Subabul growing wild on the outskirts of Mumbai
    Subabul growing wild on the outskirts of Mumbai

References

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  1. ^ a b c d "Leucaena leucocephala". Germplasm Resources Information Network. Agricultural Research Service, United States Department of Agriculture. Retrieved 2010-01-18.
  2. ^ a b c Corner, E. J. H. (1997). Wayside Trees of Malaya. Vol. I (4th ed.). Malayan Nature Society. p. 413.
  3. ^ "Leucaena leucocephala (Lam.) de Wit". Plants of the World Online. Royal Botanic Gardens, Kew. 2024. Retrieved 12 March 2024.
  4. ^ Hughes, Colin E. (1998). Monograph of Leucaena (Leguminosae-Mimosoideae). Systematic botany monographs v. 55. ISBN 978-0-912861-55-5.
  5. ^ "PLANTS Profile for Leucaena leucocephala (white leadtree)". PLANTS Database. United States Department of Agriculture. Retrieved 2009-09-19.
  6. ^ a b c Shelton, H.M.; Brewbaker, J.L. (eds.). "2.1 Leucaena leucocephala – the Most Widely Used Forage Tree Legume". Forage tree legumes in tropical agriculture. Food and Agriculture Organization of the United Nations. Archived from the original on 8 November 2017. Retrieved 24 September 2015.
  7. ^ Matthews, Donald Maxwell (1914). Ipil-ipil: A firewood and reforestation crop (Leucaena glauca (L.) Benth). Forestry Bureau Bulletin. Vol. 13. Manila: Bureau of Printing, Philippine Islands, Bureau of Forestry.
  8. ^ "Koa haole, leucaena" (PDF). Common Forest Trees of Hawaii (Native and Introduced). Retrieved 3 October 2024.
  9. ^ "Plants – Buck Island Reef". National Park Service (US). Retrieved 19 January 2023.
  10. ^ a b "2.1 Leucaena leucocephala – the Most Widely Used Forage Tree Legume". www.fao.org. Archived from the original on 2016-07-15. Retrieved 2017-08-04.
  11. ^ a b "Leucaena leucocephala (tree)". Global Invasive Species Database. Invasive Species Specialist Group. Retrieved 2010-01-18.
  12. ^ a b "Farmers to grow leucaena for animal feed". Vientiane Times. 2011-06-15.
  13. ^ "Leucaena leucocephala (Lam.) deWit". hort.purdue.edu. Retrieved 8 June 2010.
  14. ^ Hammond, A. C. 1995. Leucaena toxicosis and its control in ruminants. J. Animal Sci. 73: 1487–1492.
  15. ^ Allison, M. J., A. C. Hammond, and R. J. Jones. 1990. Detection of ruminal bacteria that degrade toxic dihydroxypyridine compounds produced from mimosine. Appl. Environ. Microbiol. 56: 590–594.
  16. ^ Allison, M. J., W. R. Mayberry, C. S. Mcsweeney, and D. A. Stahl. 1992. Synergistes jonesii, gen. nov., sp. nov.: a rumen bacterium that degrades toxic pyridinediols. Syst. Appl. Microbiol. 15: 522–529.
  17. ^ Graham, S. R., S. A. Dalzell, Nguyen Trong Ngu, C. K. Davis, D. Greenway, C. S. McSweeney, and H. M. Shelton. 2013. Efficacy, persistence and presence of Synergistes jonesii in cattle grazing leucaena in Queensland: on-farm observations pre-and post-inoculation. Animal Prod. Sci. 53: 1065–1074.
  18. ^ a b "Leucaena inoculum for cattle". Business Queensland. 2020-08-26. Retrieved 2021-08-12.
  19. ^ Subabul Reloaded: How One Tree Could Be the Answer to India’s Fodder, Fuel Needs; Published in The Better India, 11 February 2019
  20. ^ ASEAN Biodiversity[usurped]
  21. ^ Consular, Gaceta (October 1996). "Oaxaca". MexConnect. Retrieved August 15, 2010.
  22. ^ "Invasive Species South Africa – Protecting Biodiversity from Invasion – Leucaena | Leucaena leucocephala". Archived from the original on 2017-10-05. Retrieved 2017-10-04.
  23. ^ "Leucaena Leucaena leucocephala". Weed Identification & Information. Australian Weeds Strategy. Archived from the original on 2009-09-30. Retrieved 2009-09-19.
  24. ^ Fonseca, N.G.; Jacobi, C.M. (2011). "Desempenho germinativo da invasora Leucaena leucocephala (Lam.) de Wit. e comparação com Caesalpinia ferrea Mart. ex Tul. e Caesalpinia pulcherrima (L.) Sw. (Fabaceae)". Acta Botanica Brasilica (in Portuguese). 25 (1): 191–197. doi:10.1590/S0102-33062011000100022.
  25. ^ "Leucaena leucocephala (Lam.) de Wit white leadtree". United States Department of Agriculture. Retrieved 8 June 2010.
  26. ^ Kuo, Yau-Lun. "Ecological Characteristics of Three Invasive Plants (Leucaena Leucocephala, Mikania Micrantha, and Stachytarpheta Urticaefolia) in Southern Taiwan." 12 1 2003.http://www.agnet.org/library/eb/541/ (accessed 3 24 2008).
  27. ^ Tree Preservation
  28. ^ "Leucaena leucocephala – Hong Kong Flora and Vegetation". www.hkflora.com. Archived from the original on 2016-03-05. Retrieved 2017-08-04.
  29. ^ Carter, Jane (June 1995). "Alley farming: have resource-poor farmers benefited?" (PDF). ODI. Archived (PDF) from the original on 2024-06-16.
  30. ^ Das, Dipannita (8 May 2011). "Activists want Pune Municipal Corporation to allow cutting of subabul trees in city". The Times of India. Archived from the original on 15 July 2012. Retrieved 9 May 2011.
  31. ^ Chou, Chang -Hung; Kuo, Yaw -Lun (1986). "Allelopathic research of subtropical vegetation in Taiwan". Journal of Chemical Ecology. 12 (6): 1431–1448. Bibcode:1986JCEco..12.1431C. doi:10.1007/BF01012362. PMID 24307122. S2CID 25942600.
  32. ^ Hong NH, Xuan TD, Eiji T, Hiroyuki T, Mitsuhiro M, Khanh TD (2003) Screening for allelopathic potential of higher plants from Southeast Asia. Crop Protection 22:829–836
  33. ^ John J, Narwal SS (2003) Allelopathic plants. 9. Leucaena leucocephala (Lam.) de Wit. Allelopath J 12:13–36 OpenURL
  34. ^ Chai TT, Ooh KF, Ooi PW, Chue PS, Wong FC (2013) Leucaena leucocephala leachate compromised membrane integrity, respiration and antioxidative defence of water hyacinth leaf tissues. Botanical Studies 54: 8.
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