October 27, 2022 10:53 to 17:30
Head Quarters, Goa
webinar
Title of talk: Light stress induced DMS(P) production in Skeletonema costatum: An experimental approach and field observation
Speaker: Dr. Bhagyashri Naik
Biological Oceanography Division
CSIR-National Institute Oceanography, Goa
Date & Time : 27th October 2022, 1600 hrs to 1700 hrs
Meeting Link: MS Teams
Summary of the Talk
Abstract Dimethylsulphide (DMS) is a dominant biogenic sulphur anti-green house gas produced from its precursor dimethylsulphoniopropionate (DMSP) in turn produced by marine phytoplankton. A non-axenic culture of Skeletonema costatum was studied to comprehend the effects of different growth stages and light stress on DMSP and DMS production. The concentration of DMSP and DMS varied significantly at different growth stages, with high release during the stationary phase. Exposure to light after the 12-hour dark phase caused stress invariably leading to elevated levels of DMS (~ 9 fold). These observations were corroborated in a field observation, which recorded higher DMS concentrations during early mornings. While our study depicts the variable DMSP and DMS concentrations during different growth stages of S. costatum, it also gives new information on the influence of light stress on DMS production. This finding is to be considered as it may have a bearing on DMS flux calculations and budgeting
About the speaker :
Dr. Bhagyashri completed her PhD degree in Marine sciences (April 2022) under the guidance of Dr. Damodar Shenoy and Dr. Mangesh Gauns, M.Sc. in Marine sciences and B.Sc. in Microbiology. Presently she is working on phytoplankton taxonomy, culturing and maintaining uni-algal cultures in the laboratory.