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. 2013 May 14;11(5):e1001560. doi: 10.1371/journal.pbio.1001560

Figure 9. Possible evolutionary scenarios to account for the unique characteristics of the Leavenworthia S locus.

Figure 9

(Scenario I) Lal2/SCRL pollen protein-receptor function evolves from SRK/SCR paralogs in the Leavenworthia lineage, following the loss of SRK/SCR-based SI in this lineage. (Scenario II) Lal2/SCRL pollen protein-receptor function evolves from SRK/SCR paralogs in the Leavenworthia lineage and two separate S loci coexist for a portion of the history of the Leavenworthia lineage, followed by eventual loss of SRK/SCR in this lineage.