Molecular characterization of newS-RNases (‘S31’ and ‘S32’) in apple (Malus ×domestica Borkh.)’) in apple (Malus ×domestica Borkh.)

Journal of Plant Biology - Tập 51 - Trang 202-208 - 2008
Hoytaek Kim1, Jongin Park2, Yutaka Hirata3, Illsup Nou4
1Chiba University, Chiba, Japan
2Graduate School of Life Sciences, Tohoku University, Sendai, Japan
3United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan
4Faculty of Plant Science and Production, Suncnon National University, Jeonnam, Korea

Tóm tắt

Apple exhibits gametophytic self-incompatibility (GSI) that is controlled by the multiallelic S-locus. This S-locus encodes polymorphicS ribonuclease (S-RNase) for the pistil-part 5 determinant. Information aboutS-genotypes is important when selecting pollen donors for fruit production and breeding of new cultivars. We determined the 5-genotypes of ‘Charden’ (S2S3S4), ‘Winesap’ (S1S28), ‘York Imperial’ (S2S31), ‘Stark Earliblaze’ (S1S28), and ‘Burgundy’ (S20S32), byS-RNase sequencing and S-allele-specific PCR analysis. Two newS-RNases, S31 and S32, were also identified from ‘York Imperial’ and ‘Burgundy’, respectively. These newS-alleles contained the conserved eight cysteine residues and two histidine residues essential for RNase activity. Whereas S31 showed high similarity to S20 (94%), S32 exhibited 58% (to S24) to 76% (to S25) similarity in the exon regions. We designed newS-allele-specific primers for amplifying S31- and S32-RNasc-specific fragments; these can serve as specific gene markers. We also rearranged the apple S-allele numbers containing those newS-RNases. They should be useful, along with anS-RNase-based PCR system, in determining S-genotypes and analyzing new alleles from apple cultivars.

Tài liệu tham khảo

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