title: Pollen-expressed F-box gene family and mechanism of S-RNase-based gametophytic self-incompatibility (GSI) in Rosaceae.
abstract: Many species of Rosaceae, Solanaceae, and Plantaginaceae exhibit S-RNase-based self-incompatibility (SI) in which pistil-part specificity is controlled by S locus-encoded ribonuclease (S-RNase). Although recent findings revealed that S locus-encoded F-box protein, SLF/SFB, determines pollen-part specificity, how these pistil- and pollen-part S locus products interact in vivo and elicit the SI reaction is largely unclear. Furthermore, genetic studies suggested that pollen S function can differ among species. In Solanaceae and the rosaceous subfamily Maloideae (e.g., apple and pear), the coexistence of two different pollen S alleles in a pollen breaks down SI of the pollen, a phenomenon known as competitive interaction. However, competitive interaction seems not to occur in the subfamily Prunoideae (e.g., cherry and almond) of Rosaceae. Furthermore, the effect of the deletion of pollen S seems to vary among taxa. This review focuses on the potential differences in pollen-part function between subfamilies of Rosaceae, Maloideae, and Prunoideae, and discusses implications for the mechanistic divergence of the S-RNase-based SI.
authors.affiliation: Graduate School of Horticulture, Chiba University, Matsudo, Chiba, 271-8510, Japan. sassa@faculty.chiba-u.jp
authors.forename: Hidenori
authors.initials: H
authors.lastname: Sassa
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kakui
authors.forename: Mai
authors.initials: M
authors.lastname: Minamikawa
mesh_terms: D044783:F-Box Proteins / Q000235:genetics / Q000378:metabolism*; D035264:Flowers / Q000201:enzymology / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant; D007178:Inbreeding; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D011058:Pollen / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D012260:Ribonucleases / Q000235:genetics / Q000378:metabolism*; D027824:Rosaceae / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D013045:Species Specificity
chemical_list: D044783:F-Box Proteins; D010940:Plant Proteins; D012260:Ribonucleases; C022542:ribonuclease S