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Both Calvin-Benson-Bassham (C 3 ) and Hatch-Slack (C 4 ) cycles are most important autotrophic CO 2  fixation pathways on today’s Earth. C 3  cycle is believed to be originated from cyanobacterial endosymbiosis. However, studies on evolution of different biochemical variants of C 4  photosynthesis are limited to tracheophytes and origins of C 4 -cycle genes are not clear till now. Our comprehensive analyses on bioinformatics and phylogenetics of novel transcriptomic sequencing data of 21 rhodophytes and 19 Phaeophyceae marine species and public genomic data of more algae, tracheophytes, cyanobacteria, proteobacteria and archaea revealed the origin and evolution of C 4  cycle-related genes. Almost all of C 4 -related genes were annotated in extensive algal lineages with proteobacterial or archaeal origins, except for phosphoenolpyruvate carboxykinase ( PCK ) and aspartate aminotransferase ( AST ) with both cyanobacterial and archaeal/proteobacterial origin. Notably, cyanobacteria may not possess complete C 4  pathway because of the flawed annotation of pyruvate orthophosphate dikinase ( PPDK ) genes in public data. Most C 4  cycle-related genes endured duplication and gave rise to functional differentiation and adaptation in different algal lineages. C 4 -related genes of NAD-ME (NAD-malic enzyme) and PCK subtypes exist in most algae and may be primitive ones, while NADP-ME (NADP-malic enzyme) subtype genes might evolve from NAD-ME subtype by gene duplication in chlorophytes and tracheophytes.

plos one

Phylogeny of C4-Photosynthesis Enzymes Based on Algal Transcriptomic and Genomic Data Supports an Archaeal/Proteobacterial Origin and Multiple Duplication for Most C4-Related Genes