Type-4/Type-5 Self Incompatibility (SI)
Overview
| Family | Primulaceae |
| Genus | 22 (2 assembled genus) |
| Species | 1000 (3 assembled species) |
| SI type | Type-4 |
| SI genes | CCM, GLO, CYP, PUM, KFB |
Organism Image
Description
Type-4 and -5 are the sporophytic heterostyly SI of Primulaceae and Turneraceae, controlled by hemizygous S-loci mainly encoding CYP (Cytochrome P450) and TsBAHD, respectively. Athough both of them can inactivate pistil BR, they are absent in the long styles, leading to nonself pollen acceptance and self pollen rejection.
SI genes
Publication
Li J, Cocker JM, Wright J, Webster MA, McMullan M, Dyer S, Swarbreck D, Caccamo M, Oosterhout CV, Gilmartin PM. Genetic architecture and evolution of the S locus supergene in Primula vulgaris. Nat Plants. 2016 Dec 2;2(12):16188. doi: 10.1038/nplants.2016.188.
Potente G, Léveillé-Bourret É, Yousefi N, Choudhury RR, Keller B, Diop SI, Duijsings D, Pirovano W, Lenhard M, Szövényi P, Conti E. Comparative Genomics Elucidates the Origin of a Supergene Controlling Floral Heteromorphism. Mol Biol Evol. 2022 Feb 3;39(2):msac035. doi: 10.1093/molbev/msac035.
Zhao H, Zhang Y, Zhang H, Song Y, Zhao F, Zhang Y, Zhu S, Zhang H, Zhou Z, Guo H, Li M, Li J, Gao Q, Han Q, Huang H, Copsey L, Li Q, Chen H, Coen E, Zhang Y, Xue Y. Origin, loss, and regain of self-incompatibility in angiosperms. Plant Cell. 2022 Jan 20;34(1):579-596. doi: 10.1093/plcell/koab266.
Overview
| Family | Passifloraceae |
| Genus | 27 (2 assembled genus) |
| Species | 750 (4 assembled species) |
| SI type | Type-5 |
| SI genes | BAHD, YUC6, SPH1 |
Organism Image
Description
Type-5 is the sporophytic heterostyly of Turnera, involving the S-locus supergene consisting of three genes.[ref]
Based on the well-constructed S/s haplotypes, three hemizygous genes appear to determine S-morph characteristics in T. subulata. Compared to the s-haplotype, the S-haplotype possessed three additional genes and two inversions. TsSPH1 was expressed in filaments and anthers, TsYUC6 in anthers and TsBAHD in pistils. The pistil candidate gene, TsBAHD, differs from that of Primula, but both may inactivate brassinosteroids causing short styles. TsYUC6 is involved in auxin synthesis and likely determines pollen characteristics. TsSPH1 is likely involved in filament elongation.[ref]
SI genes
Publication
Shore JS, Hamam HJ, Chafe PDJ, Labonne JDJ, Henning PM, McCubbin AG. The long and short of the S-locus in Turnera (Passifloraceae). New Phytol. 2019 Nov;224(3):1316-1329. doi: 10.1111/nph.15970.