Relationship between photosynthetic processes and microcystin in Microcystis aeruginosa grown under different photon irradiances

Microcystin production by Microcystis aeruginosa: Direct regulation by multiple environmental factors

“…Interestingly, the expression of both type I and type IV RuBisCOs from M. aeruginosa PCC 7806 (the former being central to CO 2 -fixation within carboxysomes and the latter being involved in the methionine salvage pathway) have been found to be sulphurdependent (Carré -Mlouka et al, 2006), and relationships between MCYSTs and RuBisCO have been proposed previously (Jä hnichen et al, 2001;Zilliges, 2007;Zilliges et al, 2011). It is reasonable to postulate that a role for sulphur in MCYST production may be intrinsically linked to proposed relationships between MCYST production and photosynthetic processes (Jä hnichen et al, 2007;Deblois and Juneau, 2010). Neither variation in temperature nor reduced Fe 3+ supply significantly influenced MCYST production as determined by the MCYST production coefficient.…”

Spatial match between Planktothrix rubescens and whitefish in a mesotrophic peri-alpine lake: Evidence of toxins accumulation

“…However, some variability in microcystin content for equivalent P. rubescens densities was observed. This variability might be due to measurement bias or spatial differences in somatic growth rates which influence the production of toxins and thus intracellular microcystin content (Deblois and Juneau, 2010;Briand et al, 2005;Long et al, 2001). Moreover, some differences in the proportions of MC-producing and non-MCproducing subpopulations could explain the heterogeneity of microcystin concentration for a given abundance of cells.…”

Functions, Compositions, and Evolution of the Two Types of Carboxysomes: Polyhedral Microcompartments That Facilitate CO 2 Fixation in Cyanobacteria and Some Proteobacteria

“…The role of microcystins in the carboxysome is unclear; however, their production is strongly linked to the transition from high to low Ci in M. aeruginosa PCC 7806, with the microcystin maximum preceding peak Ci uptake (199). Some data suggest a relationship between microcystin production and photosynthesis (199)(200)(201)(202). Perhaps, then, microcystins play a role in adaptation of cyanobacteria to limiting Ci in some environmental niches.…”