Chapter

Self-Incompatibility in Flowering Plants

pp 193-215

Molecular Biology Of S-Rnase-Based Self-Incompatibility

  • Y. ZhangAffiliated withInstitute of Genetics and Developmental Biology, Chinese Academy of Sciences and National Centre for Plant Gene Research
  • , Y. XueAffiliated withInstitute of Genetics and Developmental Biology, Chinese Academy of Sciences and National Centre for Plant Gene Research

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Abstract

Many Flowering Plants Have Developed Self-Incompatibility (Si) Systems To Avoid Inbreeding And To Promote Out-Crossing. Among The Various Si Systems, Gametophytic Si (Gsi) In The Solanaceae, Plantaginaceae And Rosaceae Is Believed To Be The Most Common Type, In Which The Specificity Of Si Response Is Controlled By A Single Polymorphic Locus, Termed The Self-Incompatibility S-Locus. It Has Been Shown That This Locus Is Organised In A Haplotype Fashion Carrying At Least Two Genes Determining The Self And Non-Self Pollen Recognition Specificity: S-Rnase (S-Ribonucleases) Expressed In Pistil (Pistil S) And Slf (S-Locus F-Box)/Sfb(Shaplotype- Specific F-Box) Genes In Pollen (Pollen S). In This Chapter, We Present And Discuss The Current Knowledge About Molecular Biology Of S-Rnase-Based Self-Incompatibility.