Abstract
Seeded plants that reproduce through facultative apomixis produce two types of progeny: (1) apomictic progeny genetically identical to the maternal genotype, and (2) aberrant progeny genetically different from the maternal genotype. Aberrant progeny have at least nine different genetic origins depending on gametic ploidy level and whether fertilization was self, cross, or absent. Multiple genetic origins of aberrant progeny complicate the results of basic and applied genetic studies. Determining the genetic origin of progeny plants using traditional techniques, such as cytology, embryology, and segregational studies, is technically difficult in Kentucky bluegrass. We have found that two relatively new techniques, flow cytometry and silver-stained RAPD (ssRAPD) markers, are powerful tools for rapidly determining the genetic origins of aberrant Kentucky bluegrass progeny. Our application of these techniques demonstrate that (1) flow cytometry accurately distinguishes progeny ploidy levels, and (2) ssRAPD markers distinguish progeny resulting from cross-fertilization. Therefore, a combination of flow cytometry and ss-RAPD data would be useful for most genetic studies of aberrant individuals. Moreover, ssRAPD s were found to be of value for measuring the loss of genetic markers from polyhaploids and quantifying the inheritance of parental genomes in polydiploid Bn (n+n) and polytriploid BIII (2n+n) hybrids. Quantifying shared ss-RAPD markers may also be useful for determining genetic relatedness between varieties and germplasm sources.
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Communicated by A. L. Kahler
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Huff, D.R., Bara, J.M. Determining genetic origins of aberrant progeny from facultative apomictic Kentucky bluegrass using a combination of flow cytometry and silver-stained RAPD markers. Theoret. Appl. Genetics 87, 201–208 (1993). https://doi.org/10.1007/BF00223765
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DOI: https://doi.org/10.1007/BF00223765