Oceanography Seminar

March 20, 3:00pm - 4:15pm
Mānoa Campus, MSB 100

Thomas S. Bibby
National Oceanography Centre
Southampton Ocean and Earth Sciences
University of Southampton

“Photosynthetic efficiency: characterization in marine systems and optimization for biotechnological applications”

Abstract: The efficiency at which absorbed light is converted into biomass is a fundamental parameter in determining the productivity of ocean systems. Many marine phytoplankton have evolved to be very efficient at absorbing light, using a diverse range of light-harvesting pigment-protein complexes. However, the photosynthetic energy conversion efficiency is low, especially when iron is limiting – the molecular basis of this is poorly understood. Here the photosynthetic macromolecular responses of phytoplankton communities in situ and within nutrient addition experiments over a seasonal cycle in the sub-polar North Atlantic are presented. Iron stress resulted in significant increases in the cellular ratios of total chlorophyll to the photosynthetic catalysts, providing evidence that phytoplankton accumulate energetically uncoupled chlorophyll-binding complexes under these conditions. We estimate that such iron-stress-induced chlorophyll-binding proteins contribute ~30% of the total chlorophyll in the studied system. Photosynthetic energy conversion efficiency has also been identified as the central bottleneck in the commercial realization of developing photosynthetic microbes as sources of biofuels and other high-value products. We show that, by using single-cell sorting capabilities of flow cytometers in combination with random mutagenesis of wild-type populations and transcriptomics, we can select, isolate and characterize cells with improved energy conversion efficiency. The study represents a high-throughput pipeline for the development of microalgae species currently lacking genomic and/or genetic tools necessary for targeted strain improvement and thus expands the diversity of marine phytoplankton that can be considered as realistic candidates for biofuel production.

Ticket Information

Event Sponsor
Oceanography, Mānoa Campus

More Information

Share by email

Thursday, March 20

2014 Annual Veterans Conference
Mānoa Campus, UHM Campus Center Ballroom
Numata Conference in Buddhist Studies
Mānoa Campus, Hawaii Imin International Conference Center, Keoni Auditorium
World Movement
Honolulu Campus, 874 Dillingham Blvd., Honolulu, HI
Pastor Atama's Church Service
West Oʻahu Campus, E-128
Addictive Carcinogens Workgroup
Mānoa Campus, 701 Ilalo Street Conference Room 401, UHCC
Women's History Month at WCC
Windward Campus, Hale Akoakoa 105
Mary Bucholtz, Promoting Linguistic Diversity in Schools
Mānoa Campus, Center for Korean Studies Auditorium
Global Chef Program - Colombia
Mānoa Campus, Multiple Locations (See Schedule)
Writing a Research Paper
Maui Campus, The Learning Center
Beyond the Far Horizon with Alexander Henry
Mānoa Campus, Henke 325
Terrence Chida, horn
Mānoa Campus, Orvis Auditorium
Fall 2014 in Adelaide, Australia Info Meeting
Mānoa Campus, Moore 112
Persian Movie: The Fish Fall in Love (Mahiha Ashegh Mishavand), Ali Raffi, 2006
Mānoa Campus, Moore 258
Epidemiology Final Oral
Mānoa Campus, Biomed D-207
Fall 2014 in Delhi, India Info Meeting
Mānoa Campus, Moore 112
Oceanography Seminar
Mānoa Campus, MSB 100
Why do complex systems look critical?
Mānoa Campus, Watanabe Hall 112
Financing Your Graduate Education
Mānoa Campus, Webster Hall 203
Richard Bragdon, composer
Mānoa Campus, Orvis Auditorium