活動詳細資訊 Event Information
活動詳細資訊 Event Information
加入我的Google日曆

活動訊息最後更新時間 : 2017-09-12 14:03:22
開始日期 Starting Date:2017-09-22  15:30
結束日期 Ending Date:2017-09-22  16:30
會議狀態 State:確定 Definitive
主/協辦單位 Organizer:生物多樣性研究中心 Biodiversity Research Center
活動地點 Venue:跨領域科技研究大樓1 樓演講廳 Auditorium, 1st Floor, Interdisciplinary Research Building
活動備忘 Event Memo:

Abstract

      The unicellular eukaryotic red algae of Cyanidiophyceae, including Cyanidioschyzon, Cyanidium and Galdieria, are of special interest due to their habitats and systematic position. Most of the cyanidiophytes occupy acidic habitats (pH 0-4), which are detrimental to almost all other eukaryotes, and can survive up to 56°C, close to the upper temperature limit for eukaryotic life. Molecular phylogenetic data suggest that this enigmatic algal group diverged very early in the evolution of Rhodophyta. Within the Cyanidiophyceae, Galdieria has drawn much attention as it is able to grow heterotrophically on more than 50 carbon sources. The ecological significance of this metabolic versatility, however, is not clear. In attempt to address this question, G. partita isolated in the Tatun Volcano Group area, Taiwan, was axenically cultured under different growth conditions. Here we showed that G. partita cells stopped growing and were damaged under continuous high light (300 µmol photons m-2 s-1). When culture media were supplemented with 25 mM of glucose, the growth of G. partita was recovered in high light. Further analyses suggest that carotenoids are crucial in protecting G. partita from cell damage in high light, most likely through scavenging reactive oxygen species generated by light. The high-light sensitivity of G. partita cells is in accordance with the distribution of their communities limited to epilithic and endolithic microhabitats. Furthermore, we hypothesize that G. partita may acquire or retain its capability to uptake various exogenous organic carbons to enhance its tolerance to high light.


相關檔案 Related File