Characterization of a USDA Kentucky Bluegrass (Poa pratensis L.) Core Collection for Reproductive Mode and DNA Content by Flow Cytometry |
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| Authors: | Robert R Wieners Shui-zhang Fei Richard C Johnson |
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| Institution: | (1) Department of Horticulture, Iowa State University, Ames, Iowa 50011, USA;(2) USDA, Western Regional Plant Introduction Station, Washington State University, 99164 Pullman, WA, USA |
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| Abstract: | Kentucky bluegrass (Poa pratensis L.) is an important turf and forage grass species with a facultative apomictic breeding behavior. In this study, mature seed
and leaf tissue from 38 accessions of a USDA core collection of Kentucky bluegrass were analyzed with flow cytometry to characterize
the reproductive mode and DNA content for each accession. Major reproductive pathways for each accession were determined based
upon the presence and the position of the peaks observed and the known methods of reproduction for Kentucky bluegrass. While
the majority of the accessions exhibited facultative apomictic reproductive behavior with a combination of reduced, zygotic
and unreduced, parthenogenic embryo production, obligate sexual or obligate apomictic accessions were also found to be present
in this core collection. In addition, reduced, parthenogenic and unreduced zygotic embryos were also detected in several accessions.
Flow cytometric analysis of somatic tissue revealed a large range of DNA variation within this core collection. We also examined
the sensitivity of flow cytometry in analyzing bulked samples containing a large number of plants with varied DNA content
and determined that flow cytometry can effectively detect a plant having a different DNA content within a 15-plant bulk sample.
Overall the combination of mature seed and somatic tissue analysis generated important information for the Kentucky bluegrass
core collection and can be an effective and affordable tool to characterize even greater numbers of Kentucky bluegrass accessions. |
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| Keywords: | Core collection DNA content Flow cytometry Poa pratensis L Reproductive mode |
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