PSC Frontier Seminar series
Title: B-box containing protein BBX31 regulates photomorphogenesis and UV-B protection
Speaker: Prof. Sourav Datta, Indian Institute of Science Education and Research (IISER) Bhopal, INDIA.
Time: 9:30 am
Day/Date: September 21st, 2019 (Saturday)
Host: Dr. Vivek Dogra
Venue: PSC Auditorium
UV-B radiation from the sun exerts profound effects on health of all living organisms including plants. While high doses of UV-B elicit defence response in plants, low dose can act as a developmental cue. UV-B signaling in plants is initiated by UVR8 mediated UV-B perception and transduction of the signal by several light-signaling components including COP1 and HY5. We identified the role of B-box containing protein BBX31 in photomorphogenesis and UV-stress tolerance. BBX31 expression is induced by UV-B in a fluence dependent manner. HY5 directly binds to BBX31 promoter and regulates its transcript levels. Loss and gain of function mutants of BBX31 indicate that it acts as a negative regulator of photomorphogenesis under white light but is a positive regulator of UV-B signaling. Genetic interaction studies suggest that BBX31 regulates photomorphogenesis independent of HY5. Under high doses of UV-B, BBX31 promotes accumulation of UV protective flavonoids and phenolic compounds. It enhances tolerance to UV-B by regulating genes involved in photoprotection and DNA repair in a HY5 dependent manner. Overexpression of BBX31 enhances HY5 levels in a UVR8-dependent manner under UV-B, suggesting that BBX31 might regulate HY5 transcription under these conditions.
The seminar will be delivered in English.