Abstract
Single-strand conformaiton polymorphism (SSCP) profiles of six PCR-amplified fragments (250–800 bp) were analyzed in three full-sib families of pedunculate oak (Quercus robur L.) and their parents. Among the six fragments, four were polymorphic and one exhibited complex patterns that were not changed by varying the SSCP conditions. The number of bands for the analyzed fragments varied between two and four among individuals regardless of fragment size. As shown by segregation data, the variation in the number of bands between trees could only be attributed to the allelic composition (homozygotes vs heterozygotes): a genotype that exhibited two bands was presumptively homozygous, wheras a genotype exhibiting three or four bands was heterozygous. Mendelian proportions were observed in all crosses for each polymorphic fragment. In one cross, we could clearly identify a null allele due to a possible mutation at a primer site. Single-base mutations and short insertion-deletions were shown to be the molecular causes of the SSCP polymorphism observed between different alleles. The use of SSCP as a technique to identify co-dominant markers of PCR fragments (up to 800 bp) is recommended for gene diversity studies or for gene mapping.
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Communicated by J. Beckmann
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Bodenes, C., Kremer, A. & Laigret, F. Inheritance and molecular variations of PCR-SSCP fragments in pedunculate oak (Quercus robur L.). Theoret. Appl. Genetics 93, 348–354 (1996). https://doi.org/10.1007/BF00223175
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DOI: https://doi.org/10.1007/BF00223175