Effects of high- vs. low-yield environments on selection for increased biomass yield in switchgrass |
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| Authors: | IV" target="_blank">Louis W RoseIV Modan K Das Roger G Fuentes Charles M Taliaferro |
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| Institution: | (1) Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078, USA;(2) USDA-ARS, Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA;(3) General Mills Corporation, 9000 Plymouth Avenue North, Minneapolis, MN 55427, USA;(4) Present address: Aon Corporation, 200 E. Randolph Street, Chicago, IL 60601, USA |
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| Abstract: | No information is available on the effects of different biomass yield environments on selection efficiency in switchgrass
(Panicum virgatum L.) breeding improvement. This study was conducted to assess the effects of high- and low-biomass yield environments (HYE
and LYE, respectively) on recurrent selection for general combining ability (RSGCA) in a lowland population of switchgrass
(NL-94). The top 14 of 65 NL-94 C0 parent plants were selected based on biomass yield of half-sib (HS) progeny tested for one post-establishment year under HYE
and LYE conditions. Nine of the 14 C0 parent plants were the same based on HS performance under HYE and LYE. Selected plants were intercrossed to produce NL-94
HYE and NL-94 LYE C1 populations. One hundred and twenty-five HS C1 progeny families (60 NL-94 HYE and 65 NL-94 LYE) were evaluated for biomass yield for 3 years (2002–2004) under HYE and LYE
conditions. The HYE produced about 2.5 times higher biomass yields than the LYE in both C0 and C1 HS progeny tests. Estimated additive genetic variance and predicted gains from selection (ΔG) were high in the C1 populations indicating that RSGCA should achieve higher biomass yields. Mean biomass yields of C1 HS families originating from the LYE protocol were significantly higher than those of families originating from the HYE protocol
in both HYE and LYE performance tests, suggesting greater selection response under LYE in the C0 population. The estimates of narrow-sense heritability (
 ) and ΔG from the C1 populations indicate that positive response to selection for biomass yield is possible in subsequent cycles of selection
under either HYE or LYE, with a possible small advantage for HYE. |
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| Keywords: | Biomass yield Genetic gain Heritability Recurrent selection Selection environment Switchgrass |
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