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Hereditas(Beijing) ›› 2024, Vol. 46 ›› Issue (1): 3-17.doi: 10.16288/j.yczz.23-300

• Invited Review • Previous Articles     Next Articles

Molecular and evolutionary mechanisms of self-incompatibility in angiosperms

Hong Zhao(), Yongbiao Xue()   

  1. Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2023-12-01 Revised:2023-12-29 Online:2024-01-20 Published:2024-01-01
  • Contact: Hong Zhao,Yongbiao Xue E-mail:zhhong@genetics.ac.cn;ybxue@genetics.ac.cn
  • Supported by:
    National Natural Science Foundation of China(32200273);National Natural Science Foundation of China(32030007)

Abstract:

As an intraspecific outcrossing mechanism, self-incompatibility (SI) widely adopted by hermaphroditic plants is usually controlled by a polymorphic multi-allelic S locus. Typically, six molecular types of SI have been found, including type-I controlled by the pistil S S-RNase and pollen S SLFs commonly spread in Plantaginaceae, Solanaceae, Rosaceae and Rutaceae, type-II by SRK and SCR in Brassicaceae, type-III by PrsS and PrpS in Papaveraceae, type-IV by CYP-GLO2-KFB-CCM-PUM in Primulaceae, type-V by TsSPH1-TsYUC6-TsBAHD in Turneraceae and type-VI by HPS10-S and DUF247I-S in Poaceae, with type-I characterized as a non-self recognition system but types-II, -III and -VI self ones. Furthermore, remarkable progresses have been made in their origin and evolutionary mechanisms recently. Among them, type-I SI possessed a single origin in the most recent common ancestor of eudicots and types II-V dynamically evolved following its losses, while type-VI SI exclusively existed in monocot Poaceae may be regained after the loss of the ancient type-I. Here, we mainly review the molecular and evolutionary mechanisms of angiosperm SI systems, thus providing a helpful reference for their theoretical research and breeding application.

Key words: angiosperms, self-incompatibility, origin, evolution, inbred lines, crossbreeding