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Astragalus gummifer : ウィキペディア英語版 | Astragalus gummifer
''Astragalus gummifer'' (tragacanth, gum tragacanth milkvetch), is a small woody evergreen shrub, with a typical height and spread of 30 cm at maturity, indigenous to western Asia, specifically Iraq and Kurdistan. This nitrogen fixing plant bears hermaphroditic flowers, which are bee-pollinated. It has many medical, culinary, and material uses.〔“Astralagus gummifer” Practical Plants http://practicalplants.org/wiki/Astragalus_gummifer〕 ==Tragacanth gum==
''Astragalus gummifer'' produces special exudate gums that act as a natural defense mechanism for the shrub. Research has shown the function of these gums to service plants of semiarid environments, released when the bark of the shrub gets damaged in order to cover the wound to prevent infection and dehydration. The gum originally an aqueous solution dries into hardened lumps when it comes into contact with air and sunlight.〔Verbeken, Dirk. “Exudate Gums: occurrence, production, and applications” Applied Microbiology and Biotechnology Nov. 2003 Vol. 63 Issue 1 pp 10-21 http://link.springer.com/article/10.1007/s00253-003-1354-z〕
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