| 研究生: |
林咸嘉 Lin, Hsien-Chia |
|---|---|
| 論文名稱: |
蝴蝶蘭葉綠體基因體之分析 Analysis of the Chloroplast Genome in Phalaenopsis aphrodite subsp. formosana |
| 指導教授: |
吳文鑾
Wu, Wen-Luan 張清俊 Chang, Ching-Chun |
| 學位類別: |
碩士 Master |
| 系所名稱: |
生物科學與科技學院 - 生物科技研究所 Institute of Biotechnology |
| 論文出版年: | 2005 |
| 畢業學年度: | 93 |
| 語文別: | 中文 |
| 論文頁數: | 157 |
| 中文關鍵詞: | 蝴蝶蘭 、葉綠體基因體 |
| 外文關鍵詞: | chloroplast genome, Phalaenopsis aphrodite subsp. formosana |
| 相關次數: | 點閱:136 下載:4 |
| 分享至: |
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台灣阿嬤蝴蝶蘭(Phalaenopsis aphrodite subsp. formosana)葉綠體基因體的完整序列已經定序完成。蝴蝶蘭葉綠體基因體為雙股螺旋的DNA所組成,大小為148,964 bp,包括一對相反重複的序列(IRs)大小約為25,732 bp,被一個大單一基因區域(LSC) 和一個小的單一基因區域(SSC)所分離,大小分別約為85,947 bp和11,543 bp。基因體中共包含76個蛋白質轉錄基因,4種不同的核糖體基因,30個不同的tRNA基因。使用225 bp作為臨界點,亦定出有24個putative ORF。整個蝴蝶蘭葉綠體基因體的結構較類似於雙子葉植物,而非單子葉植物。17個基因存在內含子,包含有六個tRNA與11個蛋白質轉錄基因,其中clpP、rps12與ycf3等三個基因則有各兩個內含子。不同於其他被子植物葉綠體基因體,通常被子植物葉綠體基因體中有一組11個完整的NADH dehydrogenase基因,但是在蝴蝶蘭葉綠體基因體中則缺少ndhA、ndhH和ndhF基因,而ndhE、ndhG和ndhI有序列斷裂,並可能喪失基因功能。蝴蝶蘭葉綠體基因體基因的遺失,造成在已知的可行光合作用的被子植物葉綠體基因體,其含有最小的SSC。葉綠體基因體中的rpl2需要經過RNA編輯來產生正確的起始密碼,ndhB、ndhC、ndhD、ndhJ及ndhK則無法藉由RNA編輯來恢復其正常功能, ycf1則可能需要經由RNA編輯來恢復正常功能。Tajima’s relative rate test則顯示蝴蝶蘭葉綠體基因體中的蛋白質轉錄基因,與五種不同的禾本科單子葉植物的葉綠體基因體(水稻、甘蔗、玉米、小麥和野稻; 所有p’s<0.001),明顯有較慢的演化速率。
The complete nucleotide sequence of the chloroplast genome of the Taiwan moth orchid (Phalaenopsis aphrodite subsp. formosana) was determined. The circular double stranded DNA of 148,964 bp comprises a pair of inverted repeats of 25,732 bp, which is separated by a small single copy (SSC) and a large single copy (LSC) region of 11,543 and 85,957 bp, respectively. The genome contains 76 protein coding genes, 4 ribosomal RNA genes, 30 tRNA genes and 24 putative open reading frames (ORFs). Seventeen genes are intron-containing, including 6 tRNA and 11 protein coding genes. Unlike other chloroplast genomes of angiosperms, which have a complete set of genes for the 11 subunits of NADH dehydrogenase, the chloroplast genome of Phalaenopsis completely lacks the ndhA, ndhH and ndhF genes, in addition, its ndhE, ndhG and ndhI genes are truncated and probably non-functional. This loss results in the SSC region in Phalaenopsis being the shortest among known photosynthetic angiosperms. RNA editing is occurred to restore gene function of rpl2 but not ndhB, ndhC, ndhD, ndhJ and ndhK, and is hypothesized to be necessary for ycf1. Results of Tajima’s relative rate test indicates that the protein coding genes in Phalaenopsis evolved significantly more slowly than those any of the five different grasses (rice, sugarcane, maize, wheat and wild rice; all p’s<0.001) for which the complete chloroplast genome is known.
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