Sihui Zhu, Yu'e Zhang, Lucy Copsy, Qianqian Han, Dongfeng Zheng, Enrico Coen, Yongbiao Xue
The genus Antirrhinum has been used as a model to study self-incompatibility extensively. The multi-allelic S-locus, carrying a pistil S-RNase and dozens of S-locus F-box (SLF) genes, underlies the genetic control of self-incompatibility (SI) in Antirrhinum hispanicum. However, there have been limited studies on the genomic organization of the S-locus supergene due to a lack of high-quality genomic data. Here, we present the chromosome-level reference and haplotype-resolved genome assemblies of a self-incompatible A. hispanicum line, AhS7S8. For the first time, 2 complete A. hispanicum S-haplotypes spanning ∼1.2 Mb and containing a total of 32 SLFs were reconstructed, whereas most of the SLFs derived from retroelement-mediated proximal or tandem duplication ∼122 Mya. Back then, the S-RNase gene and incipient SLFs came into linkage to form the pro-type of type-1 S-locus in the common ancestor of eudicots. Furthermore, we detected a pleiotropic cis-transcription factor (TF) associated with regulating the expression of SLFs, and two miRNAs may control the expression of this TF. Interspecific S-locus and intraspecific S-haplotype comparisons revealed the dynamic nature and polymorphism of the S-locus supergene mediated by continuous gene duplication, segmental translocation or loss, and TE-mediated transposition events. Our data provide an excellent resource for future research on the evolutionary studies of the S-RNase-based self-incompatibility system.
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