Photoacclimation of terrestrial cyanobacteria
- Monday, November 20, 2017 from 3:10pm to 4:00pm
- Plant Biosciences Building, 108 - view map
Terrestrial cyanobacteria in soil, microbial mats or plant shade often grow in niches that are highly enriched in far-red light (FRL). In response to wavelengths longer than ~700 nm, some cyanobacteria undergo an extensive photoacclimation response, known as FRL photoacclimation (FaRLiP). Expression of the FaRLiP gene cluster causes extensive
remodeling of PSI, PSII, and phycobilisomes. Gene products of the FaRLiP cluster
replace the core subunits of the three complexes produced in cells grown in white light (WL). Compared to cells grown in WL, FaRLiP cells exhibit greatly enhanced oxygen evolution when assayed in FRL and therefore can grow in FRL. Low-light adapted
ecotypes of Synechococcus spp. from hot-spring microbial mats can acclimate to very low WL (LoLiP). These cyanobacteria have a conserved four-gene cluster (apcD4, apcB3, isiX, and a putative photoreceptor). ApcD4/ApcB3 has long-wavelength absorption (710 nm), but it is still unclear how these gene products enable growth at low light.
- Christine H Smith