Inbred‐Progeny Selection Is Predicted to Be Inferior to Half‐Sib Selection for Three Maize Populations

Abstract

Historically, inbred progeny selection has been promoted as an effective means of improving both inbred and outbred performance, and in some cases as being superior to other methods. Advances in theory and new estimates of genotypic covariance components have allowed us to make better predictions of gain from inbred progeny selection than previously available. We developed predicted gain equations using a full model, based on new theory and estimates, and a reduced model, which contained only the additive genetic variance in the numerator, for three maize (Zea mays L.) populations, BS13(S)C0, BSCB1(R)C13, and 3L Comp (HS‐S1)S1 Outbred progeny selection was superior to inbred progeny selection for plant height and grain yield when the response unit was the outbred population. Inbred progeny selection was superior for plant height in both populations and more effective for grain yield in BS13(S)C0 in inbred response units. Negative estimates of the covariance parameter D1 reduced predicted gain for inbred progeny selection in the full model in comparison to the reduced model when D1 was ignored.

Genetic Variances and Heritabilities of Traits of an Early Yellow Maize Population after Cycles of Improvement for Striga Resistance and Drought Tolerance

“…They concluded that the selection method involving inbred progenies was responsible for the superior gains from selection in BS11 compared with other selection methods. Contrary to theoretical arguments that recurrent selection involving inbred progenies is superior to mass selection and the half-sib recurrent selection methods, it has been demonstrated empirically that S 1 or S 2 family selection is not always superior (Coors, 1999;Wardyn et al, 2009;Edwards, 2010). For example, Wardyn et al (2009) demonstrated that predicted responses to S 1 or S 2 family selection did not show any advantages over half-sib methods in three maize populations.…”

“…They concluded that dominance genetic variance was equally important and needed to be considered in future selection programs. Contrary to theoretical arguments that recurrent selection involving inbred progenies is superior to mass selection and the half-sib recurrent selection methods, it has been demonstrated empirically that S 1 or S 2 family selection is not always superior (Coors, 1999;Wardyn et al, 2009;Edwards, 2010). In the absence of over dominance, the S 1 or S 2 family selection method is superior to other population improvement methods (Lamkey, 1992).…”

“…Weyhrich et al (1998) reported that the S 1 progeny selection scheme has been designed to improve population performance and facilitate rapid fixation of alleles, with deleterious alleles exposed to the environment for elimination during the initial stages of the selection program. For example, Wardyn et al (2009) demonstrated that predicted responses to S 1 or S 2 family selection did not show any advantages over half-sib methods in three maize populations. Weyhrich et al (1998) investigated the responses to selection of a maize population using seven methods of recurrent selection and showed that all the methods were effective in improvement of population performance per se for yield.…”

“…In the absence of over dominance, the S 1 or S 2 family selection method is superior to other population improvement methods (Lamkey, 1992). Wardyn et al (2009) explained that linkage disequilibrium, overdominance, and/or epistasis could profoundly influence predictions from selection programs. However, the greatest effect of selection for improved yield was observed using the S 2 progeny selection method.…”

Keragaan Agronomi dan Potensi Hasil Genotipe Jagung (Zea mays L.) Generasi S1 dan S2 di Dua Lokasi

“…Seleksi genotipe jagung dapat dilakukan berdasarkan produksi dan karakter lainnya (Wardyn et al, 2009). Tabel 4 menunjukkan sepuluh genotipe terbaik generasi S 1 berdasarkan produksi.…”