Apple S locus region represents a large cluster of related, polymorphic and pollen-specific F-box genes.

Plant Molecular Biology
Mai MinamikawaHidenori Sassa

Abstract

Gametophytic self-incompatibility (GSI) of Rosaceae, Solanaceae and Plantaginaceae is controlled by a complex S locus that encodes separate proteins for pistil and pollen specificities, extracellular ribonucleases (S-RNases) and F-box proteins SFB/SLF, respectively. SFB/SLFs of Prunus (subfamily Prunoideae of Rosaceae), Solanaceae and Plantaginaceae are single copy in each S haplotype, while recently identified pollen S candidates SFBBs of subfamily Maloideae of Rosaceae, apple and Japanese pear, are multiple; two and three related SFBBs were isolated from each S haplotype of apple and Japanese pear, respectively. Here, we show that apple (Malus x domestica) SFBBs constitute a gene family that is much larger than initially thought. Twenty additional SFBB-like genes/alleles were isolated by screening of a BAC library derived from S (3) S (9) genotype, and tentatively named MdFBX1-20. All but one MdFBX showed S haplotype-specific polymorphisms. All the polymorphic MdFBXs were completely linked to S-RNase in 239 segregants. In addition, FISH revealed that the monomorphic gene MdFBX11 is also located near S-RNase, and the S locus is located in a subtelomeric region of a chromosome and is not close to the centromere. All MdFBXs were...Continue Reading

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Citations

May 9, 2012·Journal of Experimental Botany·Paolo De FranceschiJavier Sanzol
Nov 6, 2010·Science·Emily Indriolo, Daphne R Goring
Feb 1, 2014·Molecular Breeding : New Strategies in Plant Improvement·Nobuko MaseHiroyuki Iketani
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Jul 13, 2019·Trends in Plant Science·Amandine CornilleIsabel Roldán-Ruiz

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