Abstract
Switchgrass (Panicum virgatum L.) is currently undergoing intensive breeding efforts to improve biomass yield. Consideration must be made regarding the relative importance of spaced plantings to sward plots for evaluation and selection for increased biomass yield. It has previously been suggested that selection schemes using secondary plant morphological traits as selection criteria within spaced plantings may be an efficient method of making genetic gain. The objective of this study was to empirically test the effects of direct selection for plant height, tiller count, flowering date, and visual selection for biomass yield within spaced plantings on biomass yield and morphology traits within sward plots. Divergently selected populations for each trait were developed from the WS4U upland tetraploid germplasm and evaluated for biomass yield at five locations in Wisconsin during two growing seasons. Significant variation was observed between maternal parents of the selected populations for both selected and nonselected traits. Despite substantial differences between parent plant populations for plant morphology, significant differences were not observed for sward-plot biomass yield or sward-plot morphology relative to the base population. Late flowering selections yielded 2.0 Mg/ha greater biomass than early flowering selections (29 % increase). Plant height within sward plots was observed to have a strong positive correlation with biomass yield. Tiller count was observed to have a weak correlation with biomass yield. Based on the observed results, it is recommended that greater emphasis be placed on evaluation of biomass yield using sward plots.
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References
Stubbendick J, Hatch SL, Butterfield CH (1991) North American range plants. Univ. of Nebraska Press, Lincoln
Nielsen EL (1944) Analysis of variation in Panicum virgatum. J Agric Res 69:327–353
Hopkins AA, Taliaferro CM, Murphy CD, Christian DA (1996) Chromosome number and nuclear DNA content of several switchgrass populations. Crop Sci 36:1192–1195
Costich DE, Friebe B, Sheehan MJ, Casler MD, Buckler ES (2010) Genome-size variation in switchgrass (Panicum virgatum): flow cytometry and cytology reveal rampant aneuploidy. Plant Genome 3:130–141
Zhang Y, Zalapa J, Jakubowski AR, Price DL, Acharya AA, Wei Y, Brummer C, Kaeppler SM, Casler MD (2011) Post-glacial evolution of Panicum virgatum: centers of diversity and gene pools revealed by SSR markers and cpDNA sequences. Genetica 139:933–948
Zalapa JE, Price DL, Kaeppler SM, Tobias CM, Okada M, Casler MD (2011) Hierarchical classification of switchgrass genotypes using SSR and chloroplast sequences: ecotypes, ploidies, gene pools, and cultivars. Theor Appl Genet 122:805–817
Vogel KP (2004) Switchgrass. In: Moser LE et al (eds) Warm-Season (C4, Grasses. American Society of Agronomy-Crop Science Society of America-Soil Science Society of America, Madison, pp 51–94
Gelfand I, Sahajpal R, Zhang X, Izaurralde RC, Gross KL, Robertson GP (2013) Sustainable bioenergy production from marginal lands in the US Midwest. Nature 493:514–517
McLaughlin SB, Kszos LA (2005) Development of switchgrass (Panicum virgatum) as a bioenergy feedstock in the United States. Biomass Bioenergy 28:515–535
Casler MD, Mitchell RB, Vogel KP (2012) Switchgrass. In: Chittaranjan K et al (eds) Handbook of bioenergy crop plants. CRC Press, Boca Raton, pp 563–590
Hartman JC, Nippert JB, Orozco RA, Springer CJ (2011) Potential ecological impacts of switchgrass (Panicum virgatum L.) biofuel cultivation in the Central Great Plains, USA. Biomass Bioenergy 35:3415–3421
Schmer MR, Vogel KP, Mitchell RB, Perrin RK (2008) Net energy of cellulosic ethanol from switchgrass. Proc Natl Acad Sci U S A 105:464–469
Shastri YN, Hansen AC, Rodriguez LF, Ting KC (2012) Switchgrass practical issues in developing a fuel crop. CAB Rev 7:1–14
Perrin R, Vogel K, Schmer M, Mitchell R (2008) Farm-scale production cost of switchgrass for biomass. Bioenergy Res 1:91–97
Eberhart SA, Newell LC (1959) Variation in domestic collections of switchgrass, Panicum virgatum L. Agron J 51:613–616
Hopkins AA, Vogel KP, Moore KJ (1993) Predicted and realized gains from selection for in vitro dry matter digestibility and forage yield in switchgrass. Crop Sci 33:253–258
Casler MD, Vogel KP (1999) Accomplishments and impact from breeding for increase forage nutritional value. Crop Sci 39:12–20
Missaoui AM, Fasoula VA, Bounton JH (2005) The effect of low plant density on response to selection for biomass production in switchgrass. Euphytica 142:1–12
Casler MD (2010) Changes in mean and genetic variance during two cycles of within-family selection in switchgrass. Bioenergy Res 3:47–54
Humphreys MO (1997) The contribution of conventional plant breeding to forage crop improvement. In: Buchanan-Smigh JG et al. (ed.) Proc. of the 18th International Grassland Congress. Assoc Mgmt Center, Calgary, AB, pp 71–78
Casler MD (1998) Genetic variation within eight populations of perennial forage grasses. Plant Breed 117:243–249
Burton GW (1982) Improved recurrent restricted phenotypic selection increases bahiagrass forage yields. Crop Sci 22:1058–1061
Hansen KA, Martin JM, Lanning SP, Talbert LE (2005) Correlation of genotype performance for agronomic and physiological traits in space planted versus densely seeded conditions. Crop Sci 45:1023–1028
Vogel KP, Haskins FA, Gorz HJ (1981) Divergent selection for in vitro dry matter digestibility in switchgrass. Crop Sci 21:39–41
Anerson B, Ward JK, Vogel KP, Ward MG, Haskins FA, Gorz HJ (1988) Foraging quality and performance of yearlings grazing switchgrass strains selected for differing digestibility. J Anim Sci 66:2239–2244
Humphreys MO (2005) Genetic improvement of forage crops: past, present, and future. J Agric Sci 143:441–448
Bhandari HS, Fasoula VA, Bouton JH (2013) Space-plant versus sward-plot evaluation of half-sib families to select parents for synthetic cultivars with superior biomass yield in lowland switchgrass. Crop Sci 53:442–451
Redfearn DD, Moore KJ, Vogel KP, Waller SS, Mitchell RB (1997) Canopy architecture and morphology of switchgrass populations differing in forage yield. Agron J 89:262–269
Das MK, Fuentes RG, Taliaferro CM (2004) Genetic variability and trait relationships in switchgrass. Crop Sci 44:443–448
Falconer DS, Mackay TFC (1996) An introduction to quantitative genetics, 4th edn. Longarm, Burnt Mill, Harlow
Price DL, Casler MD (2013a) Predictive relationships between plant morphological traits and biomass yield in switchgrass. Crop Sci In Review
Price DL, Casler MD (2013b) Inheritance of secondary morphological traits for among-and-within-family selection in upland tetraploid switchgrass. Crop Sci In Press
Casler MD, Vogel KP, Beal AC (2006) Registration of WS4U and WS8U switchgrass germplasm. Crop Sci 46:998–999
Vogel KP, Pedersen JF (1993) Breeding systems for cross-pollinated perennial grasses. Plant Breed Rev 11:251–274
Agricultural Research Service (2012) USDA Plant Hardiness Zone Map. US Department of Agriculture. http://planthardiness.ars.usda.gov. Accessed 16 April 2013
Vogel KP, Masters RA (2001) Frequency grid: a simple tool for measuring grassland establishment. J Range Manage 54:653–655
SAS Institute Inc (2011) SAS/STAT® 9.3 User’s Guide. SAS Institute Inc, Cary
Casler MD, Smart AJ (2013) Plant mortality and natural selection may increase biomass yield in switchgrass swards. Crop Sci 53:500–506
Wilkins PW, Humphreys MO (2003) Progress in breeding perennial forage greases for temperate agriculture. J Agric Sci Camb 140:129–150
Boe A, Beck DL (2008) Yield components of biomass in switchgrass. Crop Sci 48:1306–1311
Van Esobroeck GA, Hussey MA, Sanderson MA (1998) Selection response and developmental basis for early and late panicle emergence in alamo switchgrass. Crop Sci 38:342–346
Bhandari HS, Saha MC, Mascia PN, Fasoula VA, Bouton JH (2010) Variation among half-sib families and heritability for biomass yield and other traits in lowland switchgrass (Panicum virgatum L.). Crop Sci 50:2355–2363
Bhandari HS, Saha MC, Fasoula VA, Bouton JH (2011) Estimation of genetic parameters for biomass yield in lowland switchgrass (Panicum virgatum L.). Crop Sci 51:1525–1533
Lynch M, Walsh B (1998) Genetics and analysis of quantitative traits, 1st edn. Sinauer Associates, Sunderland
Casler MD, Brummer EC (2008) Theoretical expected genetic gains for among- and within-family selection methods in perennial forage crops. Crop Sci 48:890–902
Castro JC, Boe A, Lee DK (2011) A simple system for promoting flowering of upland switchgrass in the greenhouse. Crop Sci 51:2607–2614
Casler MD, Tobias CM, Kaeppler SM, Buell CR, Wang ZY, Cao P, Schmutz J, Ronald P (2011) The switchgrass genome: tools and strategies. Plant Genome 4:273–282
Acknowledgments
This research was funded in part by congressionally allocated funds through USDA-ARS by the Agriculture and Food Research Initiative Competitive grant no. 2011-68005-30411 (CenUSA) from the USDA National Institute of Food and Agriculture, and by the Gabelman-Shippo Wisconsin Distinguished Graduate Fellowship at the University of Wisconsin–Madison. We thank Nick Baker, USDA-ARS, Madison, WI for technical assistance and support with field, greenhouse, and laboratory activities.
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Price, D.L., Casler, M.D. Divergent Selection for Secondary Traits in Upland Tetraploid Switchgrass and Effects on Sward Biomass Yield. Bioenerg. Res. 7, 329–337 (2014). https://doi.org/10.1007/s12155-013-9374-8
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DOI: https://doi.org/10.1007/s12155-013-9374-8