title: Self-compatible peach (Prunus persica) has mutant versions of the S haplotypes found in self-incompatible Prunus species.
abstract: This study demonstrates that self-compatible (SC) peach has mutant versions of S haplotypes that are present in self-incompatible (SI) Prunus species. All three peach S haplotypes, S (1), S (2), and S (2m), found in this study encode mutated pollen determinants, SFB, while only S (2m) has a mutation that affects the function of the pistil determinant S-RNase. A cysteine residue in the C5 domain of the S (2m)-RNase is substituted by a tyrosine residue, thereby reducing RNase stability. The peach SFB mutations are similar to the SFB mutations found in SC haplotypes of sweet cherry (P. avium) and Japanese apricot (P. mume). SFB (1) of the S (1) haplotype, a mutant version of almond (P. dulcis) S (k) haplotype, encodes truncated SFB due to a 155 bp insertion. SFB (2) of the S (2) and S (2m) haplotypes, both of which are mutant versions of the S (a) haplotype in Japanese plum (P. salicina), encodes a truncated SFB due to a 5 bp insertion. Thus, regardless of the functionality of the pistil determinant, all three peach S haplotypes are SC haplotypes. Our finding that peach has mutant versions of S haplotypes that function in almond and Japanese plum, which are phylogenetically close and remote species, respectively, to peach in the subfamily Prunoideae of the Roasaceae, provides insight into the SC/SI evolution in Prunus. We discuss the significance of SC pollen part mutation in peach with special reference to possible differences in the SI mechanisms between Prunus and Solanaceae.
authors.affiliation: Laboratory of Pomology, Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan. rtao@kais.kyoto-u.ac.jp
authors.forename: Ryutaro
authors.initials: R
authors.lastname: Tao
authors.forename: Akiko
authors.initials: A
authors.lastname: Watari
authors.forename: Toshio
authors.initials: T
authors.lastname: Hanada
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Habu
authors.forename: Hideaki
authors.initials: H
authors.lastname: Yaegaki
authors.forename: Masami
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: Hisayo
authors.initials: H
authors.lastname: Yamane
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D001483:Base Sequence; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D005298:Fertility / Q000235:genetics; D018506:Gene Expression Regulation, Plant; D049810:Genetic Speciation; D006239:Haplotypes / Q000235:genetics*; D008957:Models, Genetic; D008969:Molecular Sequence Data; D009154:Mutation; D010940:Plant Proteins / Q000235:genetics* / Q000378:metabolism; D011058:Pollen / Q000235:genetics / Q000378:metabolism; D027861:Prunus / Q000235:genetics* / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012260:Ribonucleases / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D010940:Plant Proteins; D012260:Ribonucleases