Repository logo
  • English
  • 中文
Log In
Have you forgotten your password?
  1. Home
  2. College of Bioresources and Agriculture / 生物資源暨農學院
  3. Plant Pathology and Microbiology / 植物病理與微生物學系
  4. Construction of Infectious Clones and Detection Improvement of Citrus tatter leaf virus
 
  • Details

Construction of Infectious Clones and Detection Improvement of Citrus tatter leaf virus

Date Issued
2012
Date
2012
Author(s)
Chang, Li
URI
http://ntur.lib.ntu.edu.tw//handle/246246/256398
Abstract
Citrus tatter leaf virus (CTLV) belongs to Capillovirus, Betaflexiviridae with the genome of (+) ssRNA packaged by a filamentous virion. CTLV has been considered to be one of iportant citrus virus diseases, but the scientific data associated with CTLV are still rare so far. This thesis was dedicated to construct the infectious clones of full-length cDNA of CTLV to obtain more molecular and pathological information about CTLV. A CTLV isolate named CTLV-Pk collected from the diseased Ponkan mandarin was used for the cloning. The sequencing data reveals that the genome of CTLV-Pk consists of 6496 nucleotides (nt). The size is larger than most other genome sequences of CTLV isolates (6495 nt). The genome organization is similar to other capilloviruses, with two overlapping open reading frames (ORFs). ORF1 encodes a polyprotein p242 containing replication-associated domains and coat protein (CP). There are two variable regions in ORF1: variable region I (amino acids 532 to 570) and variable region II (amino acids 1,583 to 1,868); ORF2 encodes a putative movement protein (MP). The nucleotide sequences of full-length genome of CTLV-Pk are similar (79.4-94%) to those of the other CTLV and Apple stem grooving virus (ASGV) isolates. The similarity of amino acid sequences is 85.3-95.8% for ORF1, 92-95.8% for CP and 93.4-99.1% for MP among those isolates. The phylogenetic analyses showed that the geographic separation might lead to the molecular differences among various capilloviruses. The complete genomic RNA of CTLV can be synthesized from infectious clones through in vitro transcription. In the inoculation tests, the selected infectious clone (pCTLV-Pk-8) could successfully infect Chenopodium quinoa at 22°C and incite the symptoms similar to the original CTLV-Pk isolate. The symptoms induced by pCTLV-Pk-8 were slightly later than those by CTLV-Pk. Approximately 73.7% of tested plants were positive for CTLV-infection in the inoculation tests, and they were able to maintain stability through serial passages on C. quinoa. Meanwhile, the results also indicated that the symptoms caused by in vitro transcripts from pCTLV-Pk-8 were not evenly distributed on C. quinoa. The trial using point mutation at translational start codon of CTLV-Pk coat protein (5642 nt) demonstrated that the mutant did not cause systemic symptoms on C. quinoa. For more sensitive detection of CTLV, this study also attempted to improve the RT-PCR and develop Real-time RT-PCR assays. The RT-PCR detection of CTLV with the newly devised primer pair CTLV-501 could obtain more specific and sensitive results even using only 1 pg of RNA template. The Real-time RT-PCR with the devised “CTLV-RT-TP TaqMan primers / probes” could better results even using only 10 fg of RNA template. The results presented in this thesis were expected to provide important references for the academic research and quarantine application in the future.
Subjects
Citrus tatter leaf virus
Apple stem grooving virus
infectious clone
Type
thesis
File(s)
Loading...
Thumbnail Image
Name

ntu-101-R99633004-1.pdf

Size

23.54 KB

Format

Adobe PDF

Checksum

(MD5):f01321a4e2a89c0f4ff07f45e6e1eac2

臺大位居世界頂尖大學之列,為永久珍藏及向國際展現本校豐碩的研究成果及學術能量,圖書館整合機構典藏(NTUR)與學術庫(AH)不同功能平台,成為臺大學術典藏NTU scholars。期能整合研究能量、促進交流合作、保存學術產出、推廣研究成果。

To permanently archive and promote researcher profiles and scholarly works, Library integrates the services of “NTU Repository” with “Academic Hub” to form NTU Scholars.

總館學科館員 (Main Library)
醫學圖書館學科館員 (Medical Library)
社會科學院辜振甫紀念圖書館學科館員 (Social Sciences Library)

開放取用是從使用者角度提升資訊取用性的社會運動,應用在學術研究上是透過將研究著作公開供使用者自由取閱,以促進學術傳播及因應期刊訂購費用逐年攀升。同時可加速研究發展、提升研究影響力,NTU Scholars即為本校的開放取用典藏(OA Archive)平台。(點選深入了解OA)

  • 請確認所上傳的全文是原創的內容,若該文件包含部分內容的版權非匯入者所有,或由第三方贊助與合作完成,請確認該版權所有者及第三方同意提供此授權。
    Please represent that the submission is your original work, and that you have the right to grant the rights to upload.
  • 若欲上傳已出版的全文電子檔,可使用Open policy finder網站查詢,以確認出版單位之版權政策。
    Please use Open policy finder to find a summary of permissions that are normally given as part of each publisher's copyright transfer agreement.
  • 網站簡介 (Quickstart Guide)
  • 使用手冊 (Instruction Manual)
  • 線上預約服務 (Booking Service)
  • 方案一:臺灣大學計算機中心帳號登入
    (With C&INC Email Account)
  • 方案二:ORCID帳號登入 (With ORCID)
  • 方案一:定期更新ORCID者,以ID匯入 (Search for identifier (ORCID))
  • 方案二:自行建檔 (Default mode Submission)
  • 方案三:學科館員協助匯入 (Email worklist to subject librarians)

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science