Repository logo
  • English
  • 中文
Log In
Have you forgotten your password?
  1. Home
  2. College of Life Science / 生命科學院
  3. Ecology and Evolutionary Biology / 生態學與演化生物學研究所
  4. Developmental transition and molecular basis of floral symmetry during African violet domestication
 
  • Details

Developmental transition and molecular basis of floral symmetry during African violet domestication

Date Issued
2012
Date
2012
Author(s)
Hsu, Hui-Ju
URI
http://ntur.lib.ntu.edu.tw//handle/246246/247841
Abstract
Flower bilateral symmetry (zygomorphy) is among the major evolutionary trends in angiosperms as it greatly facilitates the interaction with pollinators thus creates the floral diversity. The wild type flower of the African violet (Saintpaulia sp.; Gesneriaceae) is zygomorphic, but flowers of its domesticated cultivars are mostly actinomorphic, which appears to be favoured by humans. This provides us a great opportunity to study the developmental transition between zygomorphy and actinomorphy, given their similar genetic background. Wild type flowers show zygomorphy in that two dorsal petals are samller than lateral and ventral ones and only two stamens developed in ventral parts. Two independently domesticated cultivars showed drastic differences in flower morphology: (1) Ventralized effect, Saintpaulia sp. cf. Little rick: five petals are large and equally proportionate, like the ventral petals of the wild type, and five stamens developed instead of two. (2) Dorsalized effect, Saintpaulia sp. cf. No-stamen: five petals are equally small, comparable in relative size to the dorsal petals of the wild type, and no stamens develop. It is known that the dorsally expressed flower genes CYCLOIDEA (CYC) and the its downstream gene RADIALIS (RAD) together with the ventral identity flower genes DIVARICATA (DIV) interact to create zygomorphy in Antirrhinum majus. I examined their expressions via real time PCR throughout the duration of anthesis between the wild type and two cultivars. In the wild type, SaCYC1A and SaCYC1B were expressed in dorsal petals at early stages, In contrast, in ‘No-stamen’, SaCYC1A and SaCYC1B expressed in all petals in early stages. In ‘Little rick’, we found SaCYC1A and SaCYC1B only expressed dorsally in early stages but their expression amount is less than wild type. Our results revealed that these differences became pronounced as early as the initiation of petal and stamen primordia. When correlating to SEM pictures of the flower development pattern, in ‘No stamen’ cultivar over-expression of SaCYC1A and SaCYC1B to all petals started as early as primordia initiated, this perhaps create the actinomorphic flower through the dorsalized effect. On the other hand, in ‘Little rick’, reduction of SaCYC1A and SaCYC1B expression was observed when primordia initiated, perhaps causes ventralized effect to generate the actinomorphic flower. Our results demonstrate that altering of genes in aspects of heterochrony, heterotopy and expression amount could trigger developmental transition between floral zygomorphy and actinomorphy during African violet domestications.
Subjects
zygomorphy
actinormophy
African violet
Type
thesis
File(s)
Loading...
Thumbnail Image
Name

index.html

Size

23.27 KB

Format

HTML

Checksum

(MD5):965f5f33aa3f95819ff9d9160bc05596

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