PS Seminar Series: PhD Exit Seminar - Understanding CO2 diffusion in C4 plants: An investigation of CO2 permeable aquaporins and carbonic anhydrase in the C4 grass Setaria viridis.


Abstract - The productive yield of key C4 crops must increase in the future to meet the demands of an increasing global population. We are therefore endeavouring to improve the availability of CO2 for photosynthesis, one of the fundamental limitations to photosynthetic carbon fixation. The initial steps of CO2 assimilation in leaf mesophyll cells involve the diffusion of CO2 from the intercellular airspace to the mesophyll cytosol (mesophyll conductance). This involves CO2 passing through the liquid phase and the plasma membrane, a process believed to be both passive and possibly facilitated by protein pores, known as aquaporins. Within the cytosol of mesophyll cells, carbonic anhydrase (CA) catalyses the hydration of CO2 to HCO3- which PEP Carboxylase uses in the first CO2 fixation step of C4 photosynthesis. This thesis has examined the role of CO2 permeable aquaporins and CA from a C4 photosynthesis perspective using the model monocot species Setaria viridis (Foxtail millet).

Biography -Hannah Osborn started her PhD with ANU and CSIRO Agriculture in 2014, previously she has worked at CSIRO Land and Water in ecotoxicology and has studied a Bachelor of Biotechnology (Honours) at the University of Newcastle. Hannah is currently working at the Office of the Gene Technology Regulator.


Date & time

1–2pm 20 September 2017


Slatyer Room (Rm 110), DA Brown Building (47), Daley Road, ANU


Hannah Osborn, Susanne von Caemmerer lab, ANU


 Gagan Bhardwaj
 02 6125 9395

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