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Dihaploid Stocks of Switchgrass Isolated by a Screening Approach

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Abstract

Manipulation of ploidy in switchgrass has potential to accelerate inbred production and to provide insight about genome structure through either sequencing or cytogenetic approaches. We have identified two dihaploid individuals isolated from among the progeny of a controlled cross between two individuals of the cultivars Alamo and Kanlow. The dihaploid lines were initially distinguished from the parental lines by their reduced heterozygosity and were subsequently confirmed through estimation of C values by flow cytometry and chromosome counts of metaphase root tip squash preparations. These plants are functionally sterile, with floral bracts that remain closed and inviable pollen. They can be easily distinguished from tetraploid individuals by their reduced stature, smaller epidermal cell size, and lower number of chloroplasts per guard cell. Aberrant meiosis in these individuals is evidenced by a lack of regular pairing at diakinesis and metaphase I and suggests that the non-homologous genomes are distinct from one another. The reduced genome size of these dihaploids will facilitate basic genome studies and genetic analyses that are impossible or problematic in polyploid accessions.

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Acknowledgments

Supported by a United States Department of Agriculture, Agricultural Research Service, headquarter-funded postdoctoral fellowship to HA Young and by ARS CRIS 9235-21000-013-00D, National Program 213/307, Bioenergy. The US Department of Agriculture, Agricultural Research Service is an equal opportunity/affirmative action employer, and all agency services are available without discrimination. Mention of commercial products and organizations in this manuscript is solely to provide specific information. It does not constitute endorsement by USDA-ARS over other products and organizations not mentioned. We wish to thank James Thompson and Gautam Sarath for critical reading of the manuscript.

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Authors and Affiliations

  1. Genomics and Gene Discovery Research Unit, USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA, 94710, USA

    Hugh A. Young, Amy L. Anderton, Christina L. Lanzatella & Christian M. Tobias

  2. Produce Safety Research Unit, USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA, 94710, USA

    Bradley J. Hernlem

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  1. Hugh A. Young
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Correspondence to Christian M. Tobias.

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Young, H.A., Hernlem, B.J., Anderton, A.L. et al. Dihaploid Stocks of Switchgrass Isolated by a Screening Approach. Bioenerg. Res. 3, 305–313 (2010). https://doi.org/10.1007/s12155-010-9081-7

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