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UID:1186@biology.technion.ac.il

DTSTART;TZID=Asia/Jerusalem:20230711T133000

DTEND;TZID=Asia/Jerusalem:20230711T140000

DTSTAMP:20230703T081337Z

URL:https://biology.technion.ac.il/en/seminars/msc-graduate-seminar-michae
 l-samin/

SUMMARY:MSc. Graduate Seminar- Michael Samin [No Categories]
DESCRIPTION:Location: hybrid- in the Faculty Auditorium/ZOOM: https://techn
 ion.zoom.us/j/97047969393  \n Affiliation: \n Host:Prof. Schuster Gadi\n S
 cavenging singlet oxygen - A key to avoid photoinhibition\n\n&nbsp\;\n\nLi
 ght drives most life on earth as photosynthetic organisms convert it to a 
 chemical energy. However\, too much light causes photodamage that may lead
  to photoinhibition (PI). Photodamage happens when photosynthetic electron
 s/energy are being transferred from the excited chlorophyll molecule to ox
 ygen. Those excited oxygen molecules are called ROS and they tend to damag
 e the photosynthetic complexes and particularly the D1 of photosystem II. 
 Living in the desert\, the microalgae Chlorella ohadii is exhibiting excep
 tional resistance to extreme high light intensity. Here\, we analyzed the 
 ROS formation in C. ohadi grown at high light intensity where other photos
 ynthetic organisms cannot survive. Examining the formation of different RO
 S revealed that singlet oxygen was almost completely depleted in HL cells 
 compared to low light (LL) grown cells. These results implied that when gr
 own in HL\, a condition where massive amounts of protective carotenoids ac
 cumulate in the thylakoids\, singlet oxygen formation is significantly red
 uced. Together with additional PI protection mechanisms that evolved in C.
  ohadii (Levin et al Plant J. 2021) the enormous quenching of ROS accumula
 tion enables this alga to thrive at light intensities where others cannot 
 survive. 
LOCATION:hybrid- in the Faculty Auditorium/ZOOM: https://technion.zoom.us/j
 /97047969393

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