Observed Gains from Three Recurrent Selection Regimes for Increased Groat-Oil Content of Oat
1991
Schipper, H. | Frey, K. J.
Increasing the groat-oil content (GO) of aot (Avena sativa L.) could increase the profitability of oat when grown as an oilseed crop or for high-energy feed grain. In this study, three recurrent selection regimes for increasing GO of oat were evaluated and compared with predicted responses. For Regime 1, selection for GO was practiced among S₀ plants grown in the field; for Regime 2, selection occurred among S₀ plants grown in the greenhouse; and for Regime 3, selection among field-grown S₀ plants was followed by selection among among and within S₀:₁ progenies grown in the greenhouse. Gains from selection for GO via the three regimes were evaluated in field experiments by using random lines from each selection for GO via the three regimes were evaluated in field experiments by using random lines from each selection cycle of each regime. Groat-oil contents increased significantly in Regimes 1 and 3, but not in Regime 2. Annual gains in GO were 6.04, 5.85, and 11.98 g kg⁻¹ in Regimes 1, 2, and 3, respectively, whereas the predicted gains were 9.69, 4.92, and 11.60 g kg⁻¹, respectively. Selection among S₀ in the field and among and withing S₀:₁ progenies in the greenhouse both contributed to the increased GO in Regime 3. In each regime, the genetic variance of GO remained significant. Line M022-4-5 with a mean GO of 162.85 g kg⁻¹ had the largest GO in the evaluation experiment. Selection for groat-oil content on the basis of data from greenhouse-grown oat plants can be successfully incorporated into a recurrent selection program. Journal paper J-14358 of the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA 50011. Project 2447.
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