||Arrivault S et al., Metabolite profiles reveal interspecific variation in operation of the Calvin-Benson cycle in both C4 and C3 plants. J Exp Bot. 2019 Mar 27 70(6):1843-1858. doi: 10.1093/jxb/erz051 p.1844 right column top paragraphPubMed ID30773587
||Silvera K, Neubig KM, Whitten WM, Williams NH, Winter K, Cushma JC. 2010. Evolution along the crassulacean acid metabolism continuum. Functional Plant Biology 37, 995–1010 link
||P.1844 right column top paragraph: "An analogous biochemical CO2 pump evolved in plants with Crassulacean acid metabolism (CAM), bicarbonate is assimilated in the dark into 4-C acids, which are decarboxylated in the light to provide CO2 for the CBC (Calvin–Benson Cycle, Shameer et al., 2018). CAM evolved in at least 35 independent lineages and is found in ~6% of current terrestrial plant species (primary source)." Primary source abstract: "This water-conserving photosynthetic pathway has evolved multiple times and is found in close to 6% of vascular plant species from at least 35 families."