Articles
S LOCUS MUTATION AND SELF-COMPATIBILITY IN STONE FRUITS
Article number
967_11
Pages
105 – 111
Language
English
Abstract
Most Prunus fruit tree species exhibit the gametophytic self-incompatibility (GSI) system, in which self-/nonself-recognition is controlled by a single multiallelic locus, called the S locus.
A self-incompatibility (SI) reaction occurs when the same S allele specificity is expressed in both the pollen and pistil.
Recently, the pistil and pollen S specificity determinants of Prunus have been shown to be the S-ribonuclease (S-RNase) and the S haplotype-specific F-box protein (SFB), respectively.
Identification of the pistil S and the pollen S determinants led to the development of PCR-based S genotyping and marker-assisted selection for self-compatible (SC) individuals.
Although the function of SFB has yet to be clarified, it is now clear that the dysfunction of either the pistil or pollen S determinant leads to SC in Prunus. Thus suppression of either S-Rnase or SFB expression could be used to produce self-compatible cultivars in Prunus. However, this technique may not be applicable to apples and pears (the tribe Pyreae in the Rosaceae) because the recognition mechanisms in the S-RNase based GSI in these fruit species seem to be similar to those of Solanaceae and Plantaginaceae, where dysfunction of the pollen S determinant is supposed to result in self- and cross-incompatible pollen production.
A self-incompatibility (SI) reaction occurs when the same S allele specificity is expressed in both the pollen and pistil.
Recently, the pistil and pollen S specificity determinants of Prunus have been shown to be the S-ribonuclease (S-RNase) and the S haplotype-specific F-box protein (SFB), respectively.
Identification of the pistil S and the pollen S determinants led to the development of PCR-based S genotyping and marker-assisted selection for self-compatible (SC) individuals.
Although the function of SFB has yet to be clarified, it is now clear that the dysfunction of either the pistil or pollen S determinant leads to SC in Prunus. Thus suppression of either S-Rnase or SFB expression could be used to produce self-compatible cultivars in Prunus. However, this technique may not be applicable to apples and pears (the tribe Pyreae in the Rosaceae) because the recognition mechanisms in the S-RNase based GSI in these fruit species seem to be similar to those of Solanaceae and Plantaginaceae, where dysfunction of the pollen S determinant is supposed to result in self- and cross-incompatible pollen production.
Authors
R. Tao, D. Matsumoto
Keywords
Prunus, self-compatibility, SFB, S-RNase
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