博碩士論文 952204003 完整後設資料紀錄

DC 欄位 語言
DC.contributor生命科學系zh_TW
DC.creator王綉華zh_TW
DC.creatorSiou-hua Wangen_US
dc.date.accessioned2008-7-12T07:39:07Z
dc.date.available2008-7-12T07:39:07Z
dc.date.issued2008
dc.identifier.urihttp://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=952204003
dc.contributor.department生命科學系zh_TW
DC.description國立中央大學zh_TW
DC.descriptionNational Central Universityen_US
dc.description.abstractGalectins 是ㄧ類哺乳動物之醣類結合蛋白,可以專一性結合半乳糖。先前研究顯示,純化之重組 galectin-1 (GAL1) 蛋白可以干擾小菜蛾(Plutella xylostella) 正常生長發育;為了進一步探討 GAL1 發展成生物殺蟲劑之潛力,本研究深入研究 GAL1 蛋白殺蟲活性及其毒性作用機制。我們首先利用原二色光譜儀 (Circular Dichrosim) 研究 GAL1 在不同 pH及溫度的穩定性,結果發現 GAL1 在 pH 8~9 時較為穩定,而這相當接近於昆蟲腸道的鹼性環境;實驗結果也顯示 GAL1 在 50 0C下結構相對穩定。幾丁質 (Chitin) 及圍食膜 (Peritrophic membrane) 為目前生物殺蟲劑新標的,本實驗結果也證實 GAL1 可和幾丁質以及圍食膜結合。為了瞭解 GAL1 的應用潛力,本實驗成功篩選了 GAL1 的阿拉伯芥轉殖株 (包括全株表現 GAL1-Arabidopsis 及維管束專一性表現 GAL1-Arabidopsis-vas 轉殖株),於全株表現的轉殖株中,GAL1 表現量約占 0.5 % ~ 1 %;餵食試驗發現 GAL1-Arabidopsis 轉殖株對小菜蛾有明顯的殺蟲活性,包括存活率、平均體重及攝食量都有隨著時間而下降。而組織化學及免疫染色切片都顯示,小菜蛾的腸道都觀察到 GAL1 蛋白的存在 ; 而超微結構顯示,餵食 GAL1-Arabidopsis 轉殖株之小菜蛾腸道表皮細胞和微絨毛都呈現不正常的形態。掃描式電子顯微鏡結果顯示餵食 GAL1 的小菜蛾,其圍食膜都呈現被破壞的現象。此一實驗顯示 GAL1 對小菜蛾之毒性機制可能與幾丁質產生結合作用,而影響昆蟲圍食膜的結構,進而影響其正常發育;由本實驗結果顯示,GAL1 蛋白可以抑制小菜蛾幼蟲正常發育,並具有發展成為生物性殺蟲劑之潛力。zh_TW
dc.description.abstractGalectins (GALs) are a family of mammalian sugar-binding proteins specific for β-galactosides. Previous studies have shown that the larval development of Plutella xylostella are significantly disturbed when they are fed them with E. coli-expressed recombinant galectin-1 (GAL1). To explore the applicability of GAL1 as a bio-insecticide, the insecticidal activity and mechanism of GAL1 were further investigated. The circular dichrosim (CD) spectrum showed that the secondary structure of GAL1 was not affected under pH 8-9 or below 50 oC. These results indicated that GAL1 was workable in the midgut’s microenvironments of most insects (pH 8-9) and also thermo-stable below 50 oC. Besides, GAL1 could interact in vitro with chitin and peritrophic membrane (PM) that are the potential targets for new bio-insecticides development. Two GAL1 over-expressed Arabidopsis 【GAL1-Arabidopsis (whole plant) and GAL1-Arabidopsis-vas (vascular bundle-specific)】.These studies also screen for insecticidal activity and mechanism studies. The results showed that expression level of GAL1 in GAL1-Arabidopsis transformants ranges from 0.5 % ~ 1 % of total leaf soluble protein. The survival rate, body weight and food consumption were significantly decreased in a time-dependent manner in P. xylostella fed on GAL1-Arabidopsis. The results of histochemical structure and immunostaining suggested that GAL1 dose- and time-dependently bound to the midgut epithelium of P. xylostella fed on GAL1-containing diet or GAL1-Arabidopsis. The ultrastructural studies further showed the disruption of the microvilli and abnormalities in epithelial cells. The scanning electron micrographs showed no PM present in P. xylostella fed on GAL1-containing diet or GAL1-Arabidopsis. Inferred from these results, the insecticidal mechanism of GAL1 involves direct binding with chitin to interfere with the structure of the PM, and GAL1 could be a potential candidate for bio-insecticides development.en_US
DC.subjectGalectin-1 蛋白zh_TW
DC.subject幾丁質zh_TW
DC.subject圍食膜zh_TW
DC.subject小菜蛾zh_TW
DC.subject生物殺蟲劑zh_TW
DC.subjectPlutella xylostella bio-insecticideen_US
DC.subjectchitinen_US
DC.subjectGalectin-1en_US
DC.subjectperitrophic membraneen_US
DC.titleGalectin-1 蛋白對小菜蛾的殺蟲活性及作用機制之研究zh_TW
dc.language.isozh-TWzh-TW
DC.titleInsecticidal action of a mammalian Galectin-1 toward Plutella xylostellaen_US
DC.type博碩士論文zh_TW
DC.typethesisen_US
DC.publisherNational Central Universityen_US

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