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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Heterodera medicaginis ： ウィキペディア英語版 Heterodera medicaginis ''Heterodera medicaginis'' (Alfalfa cyst nematode) is a plant pathogenic nematode which is cited as an invasive species.〔(''Heterodera medicaginis'' ) at American Society of Nematologists〕〔(''Heterodera medicaginis'' ) at University of Nebraska〕〔(''Heterodera medicaginis'' ) at (Invasive.org )〕 It is closely allied to ''Heterodera daverti'', ''H. glycines'' and ''H. sonchophila'' in the H. schachtii-group. The only known host plant of this obligate parasite is the important crop alfalfa or lucerne, ''Medicago sativa''.〔(A Redescription of Heterodera Medicaginis )〕 ==Description== The female alfalfa cyst nematode is white and shaped like a lemon with a body length of 0.4 to 1.2 mm and a width of 0.2 to 0.9 mm. The male is vermiform with a body length of 1.2 to 1.4 mm and a width of about 0.028 mm. The eggs are reniform, measuring 0.12 by 0.05 mm and the first two instar larvae are vermiform. The second instar larvae are mobile in damp soil and search down to a depth of 30 centimetres for suitable roots to invade. Here they develop further and become sedentary, burying their heads in cells and feeding on the cell sap. The central part of their bodies swells, and after moulting they develop into bottle-shaped third instar larvae and after moulting again, lemon-shaped fourth instar larvae. The swollen larvae break out of the root cortex. At this stage they differentiate into males and females. The males become mobile and migrate through the soil searching for females with which to mate. The females remain attached to the root tissues by their heads, continue feeding and start laying eggs. These are held within the bodies of the females which later die and turn into brown cysts with hard cuticles. These eventually become detached from the roots. The eggs develop into larvae inside the cyst and some second instar larvae emerge into the soil to start a new cycle of development. Most of the larvae lie in a state of anabiosis within the cysts where they can remain dormant for several years and still be viable.〔(AgroAtlas )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Heterodera medicaginis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.