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Hevea
Hevea
brasiliensis, the Pará rubber tree, sharinga tree, seringueira, or, most commonly, the rubber tree or rubber plant, is a tree belonging to the family Euphorbiaceae. It is the most economically important member of the genus Hevea
Hevea
because the milky latex extracted from the tree is the primary source of natural rubber.

Contents

1 Description 2 Rubber tree plantation

2.1 Latex
Latex
tapping 2.2 Wood harvesting

3 History 4 Environmental concerns 5 Synonyms 6 See also 7 Notes 8 References 9 External links

Description[edit] H. brasiliensis is a tall deciduous tree growing to a height of up to 43 m (141 ft) in the wild, but cultivated trees are usually much smaller because drawing off the latex restricts the growth of the tree. The trunk is cylindrical and may have a swollen, bottle-shaped base. The bark is some shade of brown, and the inner bark oozes latex when damaged. The leaves have three leaflets and are spirally arranged. The inflorescence include separate male and female flowers. The flowers are pungent, creamy-yellow and have no petals. The fruit is a capsule that contains three large seeds; it opens explosively when ripe.[1] Rubber tree plantation[edit]

Rubber tree seeds

In the wild, the tree can reach a height of up to 140 feet (43 m). The white or yellow latex occurs in latex vessels in the bark, mostly outside the phloem. These vessels spiral up the tree in a right-handed helix which forms an angle of about 30 degrees with the horizontal, and can grow as high as 45 ft.[2] In plantations, the trees are generally smaller for two reasons: 1) trees grow more slowly when they are tapped for latex, and 2) trees are generally cut down after only 30 years, because latex production declines as trees age, and they are no longer economically productive. The tree requires a tropical or subtropical climate with a minimum of about 1,200 mm per year of rainfall, and no frost.[3] If frost does occur, the results can be disastrous for production. One frost can cause the rubber from an entire plantation to become brittle and break once it has been refined."[4] Latex
Latex
tapping[edit] Main article: Rubber tapping

Rubber tree trunk

Latex
Latex
being collected from an incised rubber tree and a bucket of collected latex

Harvesters make incisions across the latex vessels, just deep enough to tap the vessels without harming the tree's growth, and the latex is collected in small buckets. This process is known as rubber tapping. Latex
Latex
production is highly variable from tree to tree and across clone types.[2] Wood harvesting[edit] Main article: Rubberwood As latex production declines with age, rubber trees are generally felled when they reach the age of 25 to 30 years. The earlier practice was to burn the trees, but in recent decades, the wood has been harvested for furniture making.[2] History[edit] The South American rubber tree in the Amazon rainforest, increasing demand and the discovery of the vulcanization procedure in 1839 led to the rubber boom in that region, enriching the cities of Belém, Santarém, Manaus
Manaus
and Iquitos, Peru, of 1840 to 1913. In Brazil, the initial name of the plant was pará rubber tree. The name of the tree derives from Grão-Pará and Rio Negro or only Grão-Pará (Great-Pará), the largest Brazilian province until 1850, the capital of which is Belém, where most of the fluid, also called latex, was extracted and exported. In Peru, in addition to the hispanic-speaking countries of the Amazon region, the name given was árbol del caucho, with the fluid extracted called caucho. These trees were used to obtain rubber by the natives who inhabited its geographical distribution. The Olmec
Olmec
people of Mesoamerica
Mesoamerica
extracted and produced similar forms of primitive rubber from analogous latex-producing trees such as Castilla elastica
Castilla elastica
as early as 3,600 years ago. The rubber was used, among other things, to make the balls used in the Mesoamerican ballgame.[5] Early attempts were made in 1873 to grow H. brasilensis outside Brazil. After some effort, 12 seedlings were germinated at the Royal Botanic Gardens, Kew. These were sent to India
India
for cultivation, but died. A second attempt was then made, some 70,000 seeds being smuggled to Kew in 1875, by Henry Wickham, in the service of the British Empire.[6]:55[7][8][9] About four percent of these germinated, and in 1876, about 2,000 seedlings were sent, in Wardian cases, to Ceylon
Ceylon
(modern day Sri Lanka) and 22 were sent to the Botanic Gardens in Singapore. Once established outside its native country, rubber was extensively propagated in the British colonies. Rubber trees were brought to the botanical gardens at Buitenzorg, Java, in 1883.[10] By 1898, a rubber plantation had been established in Malaya, with imported Chinese field workers being the dominant work force in rubber production in the early 20th-century.[11] Today, most rubber tree plantations are in South and Southeast Asia, the top rubber producing countries in 2011 being Thailand, Indonesia, Malaysia, India
India
and Vietnam.[12] Efforts to cultivate the tree in South America (Amazon) were unsatisfactory because of blight.[3] The blight, called South American leaf blight, is caused by the ascomycetes, Microcyclus ulei[13] or Pseudocercospora ulei.[14] Environmental concerns[edit] The toxicity of arsenic to insects, bacteria, and fungi has led to the heavy use of arsenic trioxide on rubber plantations, especially in Malaysia.[15] The majority of the rubber trees in Southeast Asia
Southeast Asia
are clones of varieties highly susceptible to the South American leaf blight—Microcyclus ulei. For these reasons, environmental historian Charles C. Mann, in his 2011 book, 1493: Uncovering the New World Columbus Created, predicted that the Southeast Asian rubber plantations will be ravaged by the blight in the not-too-distant future, thus creating a potential calamity for international industry.[16] Synonyms[edit] The genus Hevea
Hevea
is also known as:

Caoutchoua J.F.Gmel. Micrandra Benn. & R.Br. Siphonanthus Schreb.
Schreb.
ex Baill. Siphonia D.Richard ex Schreb. Siphopnicna F.Jansen ex Schreb.

See also[edit]

Castilla elastica—the principal source of latex rubber among the pre-Columbian MesoAmerican peoples List of plants of Amazon Rainforest vegetation of Brazil Red Rubber Scandal—was one of the first humanitarian global campaigns but concerned the rubber vine species Rubber seed oil Rubberwood

Notes[edit]

^ " Hevea
Hevea
brasiliensis (Willd. ex A.Juss.) Müll.Arg". Plants of the World online. Kew Science. Retrieved 31 March 2017.  ^ a b c "Rubber tapping". FAO. Retrieved 29 May 2017.  ^ a b "Elastomer-The rubber tree", Encyclopædia Britannica, 2008 ^ "The rubber tree". FAO. Retrieved 29 May 2017.  ^ Langenheim, J.H. (13 January 2010). "Introduction to Rubber Usage among the Maya". Maya Archaeology. Retrieved 29 May 2017.  ^ "The Brazilian Armed Forces: Current changes, new challenges", Dreifuss, R. Armand. International Seminar Research Committee Armed Forces and Society, Romania, 2002. Retrieved August 19, 2009 from "Archived copy" (PDF). Archived from the original (PDF) on 2009-07-31. Retrieved 2009-08-19.  ^ "Amazon - The Animation", Greepeace Digital. Artificial Environments, n/d. Retrieved August 19, 2009 from "Archived copy". Archived from the original on 2011-07-07. Retrieved 2009-08-19.  ^ "Seringueira", Wikipédia, a enciclopédia livre, 2009. Retrieved August 19, 2009 from http://pt.wikipedia.org/w/index.php?title=Seringueira&oldid=15936263 ^ "Acre: História e etnologia", Marco António Gonçalves (Org.). Núcleo de Etnologia Indígena Laboratório de Pesquisa Social/IFCS - UFRJ, n/d. Retrieved August 19, 2009 from http://eduardoeginacarli.blogspot.com/2007_07_01_archive.html ^ Winchester, Simon (2003). Krakatoa: The Day the World Exploded, August 27, 1883. HarperCollins. pp. 223–224. ISBN 0-06-621285-5.  ^ Harold A. Crouch, Economic Change, Social Structure, and the Political System in Southeast Asia, Institute of Southeast Asian Studies: Singapore
Singapore
1985, pp. 16–17 ISBN 9971-988-23-2 ^ "The Top 5 Rubber Producing Countries". Top 5 of Anything. Retrieved 29 May 2017.  ^ South American Leaf Blight
Blight
of rubber (Microcyclus ulei), plantwise.org ^ Erasing the Past: A New Identity for the Damoclean Pathogen Causing South American Leaf Blight
Blight
of Rubber ^ Sabina C. Grund, Kunibert Hanusch, Hans Uwe Wolf (2005), "Arsenic and Arsenic Compounds", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a03_113.pub2 CS1 maint: Multiple names: authors list (link) ^ Mann, Charles C. (2011). 1493: Uncovering the New World Columbus Created. New York: Knopf. ISBN 978-0-307-26572-2. 

References[edit]

Brazilian Association of Rubber Goods—ABIARB National Association Tire Industry—ANIP (Brazil) Sao Paulo's Association of Rubber Producers and Processors—APABOR (Brazil) Bio ecological production of rubber without fertilizing in Malaysia—BioRubber Brazilian Natural Rubber LATEKS magazine (Brazil) Seringueira.com - Brazilian rubber tree consulting Zhang, J., Huss, V.A.R., Sun, X., Chang, K. and Pan, D. 2008. Morphology and phylogenetic position of a trebouxiophycean green algae (Chlorophyta) growing on the rubber tree, Hevea
Hevea
brasiliensis, with the description of a new genus and species. Eur. J. Phycol. 43(2): 185–193.

External links[edit]

Wikimedia Commons has media related to Hevea
Hevea
brasiliensis.

Extraction of Rubber on YouTube

Taxon identifiers

Wd: Q156538 APDB: 108052 EoL: 1142979 EPPO: HVEBR FoC: 200012583 GBIF: 3071171 GRIN: 18974 IPNI: 349913-1 ITIS: 506431 NCBI: 3981 Plant
Plant
List: kew-98927 PLANTS: HEBR8 Tropicos: 12

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