2. Strategies for improving the photon usage efficiency and productivity of microalgal culture
The presenter mentioned two strategies for increasing light utilization by microalgae. One is to increase photosynthetically active radiation (PAR). The other is to eliminate/reduce light havesting Antenna Complexes.
They tested 3 types of algae based on their antenna size. The conclusion is that intermediate antenna size performed as well as the wild-type. She further explained why do algae with smaller antennae have higher light absorbing efficiencies. There are more penetration because of the smaller size of the antenna complex. But large antenna has higher absorption rate in the shallow pond whereas small antenna has higher absorption rate in deep pond. Intermediate did equally well in deep and shallow pond. Furthermore, the increase in chlorophyll a to b ratio might have an impact on growth at sub-saturating light intensities.