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The Center for Native Grasslands Management




Title: An "Alamo" switchgrass population with reduced seed dormancy
Year: 2002
Author(s): Tischler, C. R., Derner, J. D., Polley, H. W., Johnson, H. B.
Source Title: Proceedings of the Third Eastern Native Grass Symposium
Source Type: Proceedings
pages: 292
Original Publication:  
Abstract: Alamo switchgrass seed often germinate poorly without stratification pretreatment. This is one of the reasons Alamo switchgrass is difficult to establish. Positive results with other warm season grass species prompted us to use recurrent selection as a tool to reduce post-harvest seed dormancy in this species. We first harvested seed from a stand of Alamo in 1992, immediately placed the seed in a germinator at 35 degrees Celsius-25 degrees Celsius, and saved the seedlings germinating within 2 weeks. These seedlings were subsequently planted in the field, intermated, and seed was again harvested and germinated as described, with resulting plants placed in the field once again. A total of four cycles of recurrent selection were performed. In spring, 2000, 163 ’early germinators’ from the fourth cycle were planted in the field. Seed was harvested from individual plants and the 24 plants having seed with the highest germination percentages were dug and replanted in four replications and intermated. Seed from these 24 plants were tested for germination (under both temperature conditions) than unselected Alamo. Our protocol has successfully reduced post-harvest dormancy in Alamo switchgrass, and the experimental population is being evaluated for field establishment and possible release as a germplasm.
Publisher: The North Carolina Botanical Garden, Chapel Hill, NC, October 1-3, 2002. Omnipress, Madison, WI
Editor(s): J. Randall
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