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Genetic mapping and molecular characterization of the self-incompatibility (S) locus in Petunia inflata

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Abstract

Gametophytic self-incompatibility (SI) possessed by the Solanaceae is controlled by a highly polymorphic locus called the S locus. The S locus contains two linked genes, S-RNase, which determines female specificity, and the as yet unidentified pollen S gene, which determines male specificity in SI interactions. To identify the pollen S gene of Petunia inflata, we had previously used mRNA differential display and subtractive hybridization to identify 13 pollen-expressed genes that showed S-haplotype-specific RFLP. Here, we carried out recombination analysis of 1205 F2 plants to determine the genetic distance between each of these S-linked genes and S-RNase. Recombination was observed between four of the genes (3.16, G211, G212, and G221) and S-RNase, whereas no recombination was observed for the other nine genes (3.2, 3.15, A113, A134, A181, A301, G261, X9, and X11). A genetic map of the S locus was constructed, with 3.16 and G221 delimiting the outer limits. None of the observed crossovers disrupted SI, suggesting that all the genes required for SI are contained in the chromosomal region defined by 3.16 and G221. These results and our preliminary chromosome walking results suggest that the S locus is a huge multi-gene complex. Allelic sequence diversity of G221 and 3.16, as well as of 3.2, 3.15, A113, A134 and G261, was determined by comparing two or three alleles of their cDNA and/or genomic sequences. In contrast to S-RNase, all these genes showed very low degrees of allelic sequence diversity in the coding regions, introns, and flanking regions.

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Authors and Affiliations

  1. Intercollege Graduate Degree Program in Plant Physiology, 403 Althouse Laboratory, Pennsylvania State University, University Park, PA, 16802, USA

    Yan Wang

  2. Department of Biochemistry and Molecular Biology, 403 Althouse Laboratory, Pennsylvania State University, University Park, PA, 16802, USA

    Xi Wang & Andrew G. McCubbin

  3. Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, 48109, USA

    Xi Wang & Andrew G. McCubbin

  4. School of Biological Sciences, Washington State University, Pullman, WA, 99164, USA

    Teh-hui Kao

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  1. Yan Wang
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  2. Xi Wang
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  3. Andrew G. McCubbin
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  4. Teh-hui Kao
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Wang, Y., Wang, X., McCubbin, A.G. et al. Genetic mapping and molecular characterization of the self-incompatibility (S) locus in Petunia inflata . Plant Mol Biol 53, 565–580 (2003). https://doi.org/10.1023/B:PLAN.0000019068.00034.09

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  • DOI: https://doi.org/10.1023/B:PLAN.0000019068.00034.09

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