期刊
PLANT CELL
卷 34, 期 1, 页码 579-596出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/plcell/koab266
关键词
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资金
- National Natural Science Foundation of China [32030007]
- Strategic Priority Research Program of the CAS [XDB27010302, XDA26030302]
Research shows that different species with the SI system can detoxify S-RNases from Petunia, which may have ancestral features and have evolved additional SLFs. Type-1 is likely maintained in many lineages through deletion of duplicate S-loci, while in other lineages SI may have been lost through deletion of S-loci or retention of duplications.
The self-incompatibility (SI) system with the broadest taxonomic distribution in angiosperms is based on multiple S-locus F-box genes (SLFs) tightly linked to an S-RNase termed type-1. Multiple SLFs collaborate to detoxify nonself S-RNases while being unable to detoxify self S-RNases. However, it is unclear how such a system evolved, because in an ancestral system with a single SLF, many nonself S-RNases would not be detoxified, giving low cross-fertilization rates. In addition, how the system has been maintained in the face of whole-genome duplications (WGDs) or lost in other lineages remains unclear. Here we show that SLFs from a broad range of species can detoxify S-RNases from Petunia with a high detoxification probability, suggestive of an ancestral feature enabling cross-fertilization and subsequently modified as additional SLFs evolved. We further show, based on its genomic signatures, that type-1 was likely maintained in many lineages, despite WGD, through deletion of duplicate S-loci. In other lineages, SI was lost either through S-locus deletions or by retaining duplications. Two deletion lineages regained SI through type-2 (Brassicaceae) or type-4 (Primulaceae), and one duplication lineage through type-3 (Papaveraceae) mechanisms. Thus, our results reveal a highly dynamic process behind the origin, maintenance, loss, and regain of SI.
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