<i>Got-3 </i>アロザイムマーカーを用いたカンキツ品種の自家不和合性遺伝子型の推定

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  • Estimation of Self-incompatibility Genotypes of Citrus Cultivars with Got-3 Allozyme Markers

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Self-incompatibility (SI) in Citrus is known in cultivars and plants of pummelo, pummelo relative, and mandarin; however, the detailed mechanism of self-incompatibility and the allelic diversity of the SI gene (S) are not known because of the presence of barriers such as nucellar embryony, male sterility, and a long juvenile phase. Thus, there is little information on S genotypes of Citrus cultivars at present. In this study, the S genotypes of Citrus cultivars were estimated with the aid of allozymes produced by a glutamate oxaloacetate transaminase isozyme gene (Got-3), which appeared to link to the S gene. Of twenty-two F1 progenies from eleven crosses and their reciprocal crosses with eight monoembryonic SI cultivars, including ‘Banpeiyu’ pummelo, three F1 progenies from three crosses and three from reciprocal crosses showed segregation distortion for the Got-3 gene, suggesting the presence of the same S alleles in the cultivars used for the reciprocal crosses. Defining the ‘Banpeiyu’ genotype as S1S2, the genotype was estimated as S1S3 for ‘Tosa Buntan’, S4S5 for ‘Hassaku’, S6S7 for ‘Yuge-hyokan’, and S1S6 for ‘Shishiyuzu’. Further allozyme analyses for segregation distortion in progenies from eight crosses with eight monoembryonic SI cultivars suggested the possibility that ‘Hyuganatsu’ has S1 allele, while those from 15 crosses between the eight monoembryonic SI cultivars and five polyembryonic self-compatible cultivars suggested the possibility that ‘Rough lemon’ has S1 allele. The estimated genotypes, consisting of two of the nine alleles (S1 to S8 and Sf) in these Citrus cultivars, may be useful for further estimation and determination of S genotypes in Citrus cultivars and plants.<br>

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