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Published online 1 July 2008
Published in Crop Sci 48:1312-1320 (2008)
© 2008 Crop Science Society of America
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Heterosis in Switchgrass: Spaced Plants

Juan M. Martinez-Reynaa and Kenneth P. Vogelb,*

a Univ. Autónoma Agraria Antonio Narro, Buenavista, Saltillo, Coahuila, Mexico
b USDA-ARS, 314 Biochemistry Hall, Univ. of Nebraska, P.O. Box 8307377, Lincoln, NE 68583-0737. The reported research is from a dissertation submitted by the senior author in partial fulfillment of the requirements for a Ph.D. degree at the University of Nebraska. The research was funded in part by the USDOE's Bioenergy Feedstock Development Program at Oak Ridge National Laboratory, USDA-ARS, and the University of Nebraska

* Corresponding author (Ken.Vogel{at}ars.usda.gov).

Population and specific hybrids were made between populations and genotypes of switchgrass, Panicum virgatum L., and their progeny were evaluated for heterosis in space-transplanted field trials in eastern Nebraska for a 3-yr period. ‘Kanlow’ (lowland tetraploid) x ‘Summer’ (upland tetraploid) hybrids exhibit midparent heterosis for second- and third-year biomass yields for both population and individual plant hybrids. These data and previously reported molecular marker data indicate that lowland-tetraploid and upland-tetraploid switchgrasses represent different heterotic groups that can potentially be used to produce F1 hybrid cultivars. Hybrids produced from cultivars and experimental strains developed from upland-octaploid germplasm originating from spatially separated western and eastern regions of the original tallgrass or an adjacent forested ecoregion did not exhibit heterosis for any trait evaluated. These results suggest that these upland populations evaluated were from the same or closely related large germplasm pools or heterotic groups. A method for developing F1 switchgrass hybrid cultivars utilizing the gametophytic self-incompatibility mechanism of the species is described.

Abbreviations: OBP, original base population • RAPD, random amplified polymorphic DNA • RFLP, restriction fragment length polymorphism

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Received for publication December 21, 2007.




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