Legume Genomics and Genetics 2024, Vol.15, No.1, 27-36 http://cropscipublisher.com/index.php/lgg 30 Figure 2 An overview of proposed evolutionary histories of the rhizobial nitrogen-fixing symbiosis in Fabaceae (Adopted from Zhao et al., 2021) Image caption: Microbiont switch hypotheses for the evolution of rhizobial nodulation in Fabaceae. The phylogenetic tree shows different clades and the state of nitrogen-fixing nodulation; Character states: Blue circles represent rhizobial nitrogen-fixing nodulation; Yellow circles indicate actinorhizal nitrogen-fixing nodulation; Red circles signify a lack of nitrogen-fixing nodulation; Black circles denote unknown or uncertain states; Symbols:"R" indicates a rhizobial microsymbiont; "A" denotes an actinorhizal microsymbiont; "S" signifies a microsymbiont switch; Green stars represent switches to rhizobial nodulation; Red stars indicate losses of rhizobial nodulation; Key clades and their species counts are highlighted in magenta. SH1/SH2 and SH3 indicate different hypotheses of nodulation evolution, with SH1/SH2 suggesting one switch and multiple losses, and SH3 indicating two switches and multiple losses (Adopted from Zhao et al., 2021)
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