Authors: Ryutaro Tao Akiko Watari Toshio Hanada Tsuyoshi Habu Hideaki Yaegaki Masami Yamaguchi Hisayo Yamane
Publish Date: 2006/09/28
Volume: 63, Issue: 1, Pages: 109-123
Abstract
This study demonstrates that selfcompatible SC peach has mutant versions of S haplotypes that are present in selfincompatible 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 SRNase 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 SolanaceaeThe authors gratefully acknowledge the helpful comments from Hidenori Sassa of Chiba Univ Koichiro Ushijima of Okayama Univ and Amy Iezzoni of Michigan State Univ and the gifts of plant material from Yukio Sasabe at the Okayama Prefectural Agricultural Experimental Station Okayama Japan and Rafael Socias i Company at the Unidad de Fruticultura Centro de Investigación y Tecnología Agroalimentaria de Aragón Zaragosa Spain This work was supported by a GrantinAid no 17380021 for Scientific Research B to RT
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