| 研究生: |
阮氏翠瓊 Nguyen, Thi Thuy-Quynh |
|---|---|
| 論文名稱: |
利用轉錄體探討植物對砷逆境的反應及耐受性以及其中的機制 Transcriptome analyses provide insights into Arsenic-stress responses and tolerance mechanisms in plants |
| 指導教授: |
黃浩仁
Huang, Hao-Jen |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
生物科學與科技學院 - 生命科學系 Department of Life Sciences |
| 論文出版年: | 2014 |
| 畢業學年度: | 103 |
| 語文別: | 英文 |
| 論文頁數: | 194 |
| 外文關鍵詞: | Arsenic, Oryza sativa, Arabiopsis, Glutathione, Oxalate oxidase, WRKY76, LRR-RLK VIII |
| 相關次數: | 點閱:94 下載:1 |
| 分享至: |
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砷為一具有毒性的類金屬,且廣泛的存在於環境中,並對植物具備很強的毒性。然而,目前為止植物對砷逆境的反應還未被徹底的瞭解。在砷的逆境中,三價砷造成的毒性反應遠比五價砷來的強。此篇研究試圖找出植物中造成此不同毒性反應的基因。我們利用生物晶片分析水稻對三價砷與五價砷的反應,生物資訊分析顯示有一群基因對兩者皆具有反應。這群因大多與解毒機制相關,列如熱休克蛋白、細胞色素P450、UDP糖基轉移酶以及谷胱甘肽s-轉移酶 (GST)。有趣的是大部分被三價砷誘導表現量上升的基因,其表現量遠高於對五價砷的反應。脫落酸反應片段結合因子(ABA response element binding factor) (Os01g0859300) 以及 WRKY76 (Os09g0417600)在三價砷的逆境下有較高的表現量(大於八倍)。除此之外,三價砷處理下我們也發現草酸氧化酶(OXO)表現量以及活性的增強。另外,麩胱甘肽(glutathione)的表現量在兩種砷處理下都先下降(12小時處理),而在處理24小時候上升。過氧化氫酶以及過氧化酶活性在12小時及24小時處理下皆上升。
除了水稻之外,我們發現了兩種生態型的阿拉伯芥對砷俱備不同程度的耐受性。耐受性較強的為Col-0,較弱的為Ws-2. 我們利用生物晶片比較兩種生態型在遇到五價砷時的轉錄體變化。被Col0獨特調控的基因中,大多數為熱休克蛋白,熱休克因子、泛素以及水通道蛋白。除此之外,我們發現了與Col-0 耐受性相關的基因。我們研究了其中一個耐受性相關的蛋白質激酶(Leucine-Rich Repeat receptor-like kinase VIII)的突變株,發現在此Col-0 的突變株中,五價砷的耐受性與累積量皆會受到影響。
針對植物對不同價數砷的耐受性,本研究提供了更深入的探討,有助於未來更進一步研究與砷耐受性相關的基因以及植物中砷的去毒性機制
Arsenic (As) is metalloid found ubiquitously in natural environment and is generally highly toxic to plants. However, the molecular mechanisms of plants in response to As have not been extensively characterized. Thus, we aimed to identify genes that discriminate the effect of Asenite (AsIII) and Asenate (AsV) during early response to rice roots (Oryza sativa L. cv. TN67). To gain more insights into cellular responses to arsenic, we have undertaken a large-scale analysis of the rice transcriptome challenged with AsIII and AsV stresses. Bioinformatic analysis indicated that a series of transcripts differently appeared in general responses to both of arsenic. Most of these common response genes related to detoxification such as heat shock proteins, Cytochrome P450, UDP-glycosyltransferase and Glutathione S-transferase. Interestingly, expression levels of most of AsIII-induced genes were strongly increased than that found in the AsV-induced. Expression level of genes encoding to bZIP10 (Os01g0859300) and WRKY76 (Os09g0417600) under AsIII treatment was higher (> 8-folds) than that in AsV treatment. The enhanced expression and activity of oxalate oxidase (OXO) were observed in AsIII-subjected rice roots. Additionally, the glutathione contents from both treatments at 12 h decreased, whereas increasing during 24 h treatment with As. Catalase (CAT) and peroxidase (POD) activities in rice roots were induced after 12 h and 24 h in both of arsenic treatments.
Concurrently, we compared transcriptional changes on genome-wide gene expression with AsV treatment in two AsV-tolerant (Col-0) and sensitive (Ws-2) Arabidopsis ecotypes. Most of the specific response genes encoded heat shock proteins, heat shock factors, ubiquitin and aquaporin transporters. In addition, we provided a comprehensive survey of global transcriptional regulation for AsV and identified stress- and tolerance-associated genes responding to AsV. Genetic loss-of-function analysis of a tolerance-associated gene candidate encoding Leucine-Rich Repeat receptor-like kinase VIII (LRR-RLK VIII) revealed altered AsV sensitivity and the metal accumulation in roots.
Taken together, these data provide an overview of molecular changes elicited for further investigation and may help better understand to As tolerance-associated genes and the mechanism of arsenic detoxification in plants.
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