Inheritance of Sf-RNase in Japanese apricot (Prunus mume) and its relation to self-compatibility

Self-compatible cultivars of Japanese apricot (Prunus mume Shieb. et Zucc.), a tree species that normally shows S-RNase-based self-incompatiblity, have a horticultural advantage over self-incompatible cultivars. Inheritance of self-compatibility and a common S^sup f^-RNase allele that is observed in...

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Veröffentlicht in:Theoretical and applied genetics 2002-08, Vol.105 (2-3), p.222-228
Hauptverfasser: TAO, R, HABU, T, NAMBA, A, YAMANE, H, FUYUHIRO, F, IWAMOTO, K, SUGIURA, A
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Sprache:eng ; jpn
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Zusammenfassung:Self-compatible cultivars of Japanese apricot (Prunus mume Shieb. et Zucc.), a tree species that normally shows S-RNase-based self-incompatiblity, have a horticultural advantage over self-incompatible cultivars. Inheritance of self-compatibility and a common S^sup f^-RNase allele that is observed in self-compatible cultivars was investigated using progenies from controlled crosses. Total DNAs were isolated from the parents and progenies of seven crosses that included at least one self-compatible cultivar as a parent. These DNAs were PCR-amplified with the Pru-C2 and PCE-R primer pair to determine S-haplotypes of the parents and progenies. A novel S-haplotype, S^sup 8^, was found. In all crosses examined, the S^sup f^-RNase gene was inherited from either the seed or pollen parent as a pistil S-allele in a non-functional S-haplotype. Self-compatibility of about 20 trees each from reciprocal crosses of 'Benisashi (S^sup 7^S^sup f^)' and 'Shinpeidayu (S^sup 3^S^sup f^)', and 26 selections from 16 different crosses was tested by pollination and pollen-tube growth studies. Cosegregation of the S^sup f^-RNase allele and self-compatibility was confirmed with all but selection 1K0-26 (S^sup 3^S^sup 7^). Selection 1K0-26 (S^sup 3^S^sup 7^) that originated from 'Benisashi (S^sup 7^S^sup f^)' × 'Koshinoume (S^sup 3^S^sup f^)' appeared to be self-compatible even without the S^sup f^-RNase allele. The possible role of pollen-S, a presumably existing pollen component of gametophytic self-incompatibility, is discussed.[PUBLICATION ABSTRACT]
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-002-0980-7